skysight-inc/HackerNews huggingface dataset:
Launch HN: Jika (YC S20) – Price A/B Testing for Shopify
Hi all! I'm Kennan and I recently founded Jika (https://jika.ai). Jika helps Shopify sellers A/B test their product pricing so they can make more money.

Let’s say you sell shoes on Shopify for $100 and want to test $110. You’d 1-click install the Jika Shopify App and go to a dashboard where you select and start a test for $110. We then handle the heavy lifting of showing price A to 50% of your visitors and price B to the other 50%. As the test is running, Jika keeps track of revenue, conversions, and visitors at each price point. You’d repeat this process as much as you can since the optimal price for a product is always changing.

Up until now, most people have priced off competitors, but that doesn't cut it anymore with big companies getting more and more sophisticated. A prime example of this is Amazon accelerating their development of in-house brands (~640 in late 2019) and using their dataset to outprice other online sellers (2.5m price changes per day in 2013 and more today).

One recent test of a best selling product for a Shopify brand doing 1M+ monthly revenue resulted in a data significant ~10% revenue lift from a -7% price. This better price for the best selling product translates to a ~30k+ monthly revenue increase (~180k+ revenue over 6 months).

I chose to work on pricing because I love optimization. Past optimization includes dropping out of college after 1 year to be a growth (A/B testing) engineer at Pinterest for 3 years and building an app for discounts + promotions at Hulu. In high school, I also optimized enough to be a top 200 player in League of Legends.

Would love to answer any questions or comments below!

PS. If you know anyone on Shopify, I'd love to help them nail down their pricing. :D
Planet Money had an episode on such metrics[0]

The host shares a personal story from time when he was a cashier. The grocery chain measured performance as items scanned per minute and shared internal leaderboard.

Some items are hard to scan so the cashiers ended up skipping scanning them – so the store gave them away for free. But the managers were happy about their KPIs. (Look how many items are we suddenly selling per minute!)

[0] - https://www.npr.org/transcripts/669396192 (both podcast and transcript)

I love this podcast.
BLS: https://www.bls.gov/news.release/pdf/empsit.pdf

They release a jobs report on the first friday of each month with asjustements as data from prior months made it in. They survey businesses and process a lot of other data to deliver these reports and have been generally apolitical and data focused though the current administration has tried to influence numbers to their advantage, effectively undermining a critical component of our democracy.
People would just create multiple accounts.

No matter how high you build the wall, someone will always bring a taller ladder.
I'm a huge knife steel nerd, so it's cool to see this article get some love on HN. Currently, I own knives in S35VN, M390, Cruwear, and 52100, all Spyderco. If you've never carried an EDC knife before I suggest you pick up a Spyderco Manix or PM2/PM3 and try it out. There's a lot of engineering and craftsmanship that goes into making a quality knife which I think HN readers could appreciate. Also, they're just handy to have around.
The plywood mentioned by GP is kind of heavy, and it needs framing for stiffness too. The molded steel used in "real" cars and trucks would be lighter. So would something handmade from carbon. Just thinking by analogy with boat hulls, I don't see why fiberglass wouldn't work either. My parents have a pickup camper the walls of which are made from Styrofoam or something similar. This seems to work; I can climb on the roof to adjust the antenna and I'm fat.
> I got the impression that the author doesn't quite know the volume of people holding ~100k in TSLA options that could easily be 5x that with a well-crafted tweet.

When communications are hacked, the market typical figures it out in a matter of minutes. Anyone wishing to capitalize on a Twitter hack would have to have perfect timing to exit their trade.

If someone was trading options of a similar volume all day every day before and after the hack, they might be able to blend in. However, once you filter down on the number of people who caught windfalls in the narrow window of time between the hack and when the market reversed and then filter further for people who invested atypically large amounts on that particular trade, it's not as short of a list as you suggest.
The SEC can look at each of them.
Compliance and suspicious trading activity mechanisms put in place by financial actors are very sophisticate.
Analyze millions of trades and make reports out of it is not a big deal. I wouldn't be surprised if SEC is already analyzing trades related to stocks impacted by this hack.
it is precisely because 4chan one of the last popular "free" sites that it is more extreme. if the entire internet were more like it, there would be more mild sites with more PC discussion that you could join.

A site could still allow accounts and banning and have guidelines around discussion topics, it doesn't have to be completely anonymous like 4chan.
The Tweak New Twitter extension has an option to permanently keep you in latest tweets mode.
So many programs I've written would have been easier with Erlang's binaries and pattern matching. A lot of what I've done has boiled down to parsing and transforming binaries from one format to another. I've made a few POCs for work in the past (that I couldn't have convinced them to use no matter what, only C/C++/C#/Python were used) that demonstrated a much simpler version of core program logic because of those two features. The code was often 1/10th the size (if not smaller), clearer, and more extendable. And this wasn't just because I was writing it for a second (or third) time. The code in the other languages was good, clean code as well. It's just harder in those languages to express the same things as concisely.
You can get exact numbers in table form here: https://oui.doleta.gov/unemploy/wkclaims/report.asp

The latest jobs report, which has a graph of the year's data, is here: https://www.dol.gov/ui/data.pdf

The numbers here are basically on an exponential decay curve from ~6M new claims in the last week of March. (FWIW, the pre-2020 record for new weekly claims, seasonally adjusted, was ~700k in 1982--we broke that in March and haven't stopped breaking it since).
You're thinking of a decade ago, when people made fun of Twitter for being frivolous but harmless:

Example: Supernews, on the topic of Twitter: https://www.youtube.com/watch?v=b5Ff2X_3P_4

Today, numerous important organizations and projects have blown off the original distributed Web architecture and email, and embraced Twitter and/or Facebook as their primary public communication channels.
They’re using Mullvad’s network. Basically reselling it. But it seems to be around 70 cents (US dollar) cheaper since Mullvad charges in Euros and Mozilla uses US dollar.

I’ve been using Mullvad for several years now and they’ve been reliable. They have independent security audits done and are known for their privacy.
Do you have specification of a memory model?
Given the ability to completely access arbitrary Twitter accounts using an internal tool, begs the question, how else has this been exploited?
Nope, still looking into it, but at first glance it seems someone paid off a Twitter employee to get a hold of some accounts.

Which makes it really concerning, Twitter can essentially impersonate the President and influence the markets, start a war, etc
I don't know who warned you, but no, going against the dominant ideologies here is not a bannable offense. It can be bannable if 1) that's all you talk about here and 2) you talk about it in the wrong way?

What's the wrong way? Personal attacks, attacks on groups of people, and/or consistently too much snark and not enough substance. Complaining about the moderation and/or downvotes doesn't go over big, either.
I'm in my 30 with a family and find that I am much slower at learning new stacks now. I was a FileNet developer and then a Neoxam developer. There aren't many opportunities for me.

I'm also just tired of the bullshit and and mind games that management plays. My current plan is to gamble in the stock market and 'retire' whenever I can't take it anymore or get fired. I would love to retire to run a small farm and/or work a retail job like Lowes.
Author here (I didn't use Show HN because it's a larger collaborative project). Yes this is basically a tradeoff between accuracy and flexibility+accessibility.

For usability testing, physical eye trackers have to be used one person at a time (no simultaneous use), use an experimenter's time to schedule and administer, can only be used for a short period, and only work with local participants. But yes they will probably always have better accuracy, and detect saccades/fixations better which are also great for psychology studies.

The other thing is if you want to make a consumer application (like browser game, or accessibility mode), then it's more practical to have people just consent to having their webcam turned on, than to go out and buy an eye tracker.
Sure, it is, and that's why you may not require one. But I can see why people would want that, even with no malicious intention, which was your question :)
Is there a reason why you can't get by on $170k?
This, along with some of the comments here, reminded me of a short passage from a profile on Tupac Shakur, in which the author wrote:

"He feels his mania is what we all have and deny, that insanity is a rational adjustment to an insane world." [0]

[0] https://www.spin.com/2017/06/tupac-birthday-danyel-smith/
No, thank you for actually spreading the word about the condition system and stressing the parallel between algebraic effects and conditions. It's an important one.
Hmm, not sure -- do you see the gaze dot when you're looking at the center circle?
New ideologies have always formed as thought bubbles like this, but now they're forming fasting than ever. Question is: are thought bubbles OK, or should we try to pop them? This forum itself is a thought bubble, surely they can't all be bad.
If this Twitter hack has profound national security implications, then Twitter itself already has profound national security implications that weren’t being appropriately recognized or addressed.
That seems a particularly odd use of the term given that, as you say, the title is mostly descriptive.

However, more broadly some people seem to use the term for anything that isn't just blandly descriptive. Headline writers have been pulling out interesting facts or making clever puns or whatever device to persuade people to read stories since before there were clicks. The average headline in The Economist probably qualifies as clickbait if cleverness is off the table.
I hate the fact that in my current role, I am expected to give my colleagues ‘constructive feedback’.

It seems like a minefield , when I am trying to focus on my own role, that I have to negotiate the feelings of a colleague as I leave feedback on them. I’d prefer to leave only positive feedback, but what my boss wants is that I need to find an improvement that my colleague has to make. I don’t like it.
The bulk of Twitter users don't know this. And it became more than a "social message board" once the general public realized they couldn't trust the media to be unbiased.
I want to, but I find the lying and mind games to be morally offensive, especially when they can have such a large impact on a person's wellbeing.
We've banned this account for repeatedly breaking the site guidelines. Please don't create accounts to do that with.

https://news.ycombinator.com/newsguidelines.html
Voice quality, speaking mannerisms, etc. are extremely critical. Probably more so that visual. It's a major boon having a charismatic personality whether you look good or not.

A video with just poor sound quality (bad mics, noise) but otherwise excellent is nearly unwatchable. Same with a nasally, monotone, dry and boring speaker.
Enable 2D Inking for the Web
Not only self repression but also navigating the web of frail, shallow opinions and antagonistic emotions (granted the workplace under consideration is not a place of friendship) leading to non sense most of the time. It's not a place of truth.
Just in general say thank you more often. It helps a lot with team morale.
Oh hey, thanks for this extension, I swear this extension is the only reason I find Twitter nearly tolerable anymore. (Of course extensions can't fix the toxicity of Twitter itself, but hey.)
While aggressive, that won’t really do anything

Something along the lines of

> I’ve instructed the Pentagon to immediately launch an attack on North Korea and China, using any force necessary (even nuclear). God bless

Would do the trick
The most info I have seen thusfar https://www.vice.com/en_us/article/jgxd3d/twitter-insider-ac...
“To be human” is a soft phrase. What does that mean? It appears to assume an standard. The purpose of that appears to be to pull a no true Scotsman.
Shoploop: An entertaining new way to shop online
I would not target stocks - that requires too much capital. Rather target currencies. A retail investor can leverage currency transactions 100 to 1 -- and such speculators are numerous. Also, Forex runs 24x7.

What if the US Federal Reserve had tweeted out a link to fake economic data suggesting an enormous fall in the USD was around the corner? Algorithmic trading could shift the USD by $0.01, which when multiplied 100x could have a pretty large impact on your USD/EUR play.
I wish he kept the Mullet. It truly was art.
This is what whales have been doing on the internet for decades with penny stocks etc.
My personal opinion is that that would be true in more or less the same way that colder gases are more like solids.
I work in TensorFlow with some regularity, and I've seen explicit examples of what the author of the article talks about where Googlers get used to their own stack (See eg: https://github.com/abseil/abseil-py/issues/99#issuecomment-4... vs what is considered standard Python practice https://github.com/tensorflow/tensorflow/issues/26691#issuec... )

That said, I also see the opposite when this gets some traction with "normal users". The Abseil issue was fixed, and the TensorFlow 2.0 release did make TensorFlow more usable by smaller teams in many situations.
I have experienced what you have -- food is about the same or more expensive than before. But the housing market has softened. Retail goods in stores are much cheaper. Clothing is incredibly cheap -- go to an outlet store and you'll see 50% sales everywhere.
Bots could instantly destroy whatever account they want, and people would feel guilty about following someone/something popular and just not do it, which eliminates the point of a follow system except for for personal friends/family. So basically it would make it more like Facebook and anyone with a bit of time/money could almost definitely delete anyone's account they wanted to.
God damn I hate the media. Nowhere, and I mean nowhere in that article does it clearly state that's $1.5T over 10 years.

So in fact, it's a $150B tax cut annually. For a $3.7T budget that's costing about 4%.
Until November 2013 Microsoft used stack ranking.
I once considered getting into the 802.11 stack for a couple of BSDs after experiencing several issues with my cards. Some were minor and I was able to fix (driver wouldn't attach because it was missing a PCIe device ID) and other weren't.

I couldn't find much good material on it though. A popular FreeBSD driver book noted that 802.11 driver development was too complicated to be in scope of the book, and that to even start, you should you have a solid understanding of 802.11.

I figured the specs might be a good place to start, but noped out as soon as I saw how much IEEE charges for the individual 802.11 specs. Some resources, including the site for the Linux kernel's wireless stack note that IEEE at one point would make the specs available for free once they reached a certain age, but that doesn't seem to be the case anymore. The closest thing I could find was a copy of the 802.11b spec, which isnt very helpful.
I think you're going to be quite astonished come November.
Saying "Yes man" probably derailed my thesis since it's associated with the higher rungs of the corporate ladder. I thought that this would be uncontroversial.

I'd like to focus on Dating because I disagree with your offhand comment, even though it was in jest and is probably more cynical than you are in person.

> The more … apathetic ill be cherished. Sounds like dating ;)

Feeling bad makes your behavior suffer. Being angry makes you less nice to people. Being tired means you don't engage with people. Being scared or anxious makes you hide your vulnerabilities and close yourself off. I'm not saying that badly behaved people deserve to be ignored, I'm acknowledging that it is uncomfortable to interact with people who are hurting.

Being "driven and hungry" while dating makes you behave worse. It makes you over-eager to please the other person, and it flattens out your personality. Instead of focusing on making the person like you, you should be exploring whether you like each other. A date can be successful even if the two of you don't end up dating because you two would not make a good couple.
Nobody is eliminating dissent. Threads on divisive topics are filled with disagreement. It's flamewar comments that are the problem, because flamewars are so stupid, so predictable, and so nasty. They're the worst thing that group dynamics lead to on internet forums. On HN, we want thoughtful, curious conversation. If you don't want to post in that spirit, please don't post. If you're interested in using the site as intended, please read https://news.ycombinator.com/newsguidelines.html and take the intended spirit to heart.

I have no idea what "tech bro ideology" is but whatever politics you favor, I can give you a long list of comments bitterly complaining that HN is dominated by it and the mods are secretly conspiring to suppress everybody else. Edit: actually here you go—see the list here: https://news.ycombinator.com/item?id=23807579

All such comments are the same—the righties say it and the lefties say it, everyone says it. It is pure cognitive bias.
This kind of scenario is exactly why I imagined that the very first thing that the secret service would do is snap Trump's phone in half and throw it in the bin. Yet another thing to add to the long list of new legislation that needs to be written, though I'm not sure how it do it. "All government officials using twitter must also post the PGP signature of any tweets they plan to make BEFORE they post them to twitter, and also post them to _some other service_ as well."
> months before WW2

What's the definition of WW2 here? US supplied oil and metal to Japan until 1941 [0], 3 years after Japan invaded China [1].

[0]: https://en.wikipedia.org/wiki/Events_leading_to_the_attack_o...

[1]: https://en.wikipedia.org/wiki/Second_Sino-Japanese_War
A Spyderco Manix seems to cost about twice as much as a ~15 tool Victorinox. In what way is it better, given that it's just a knife?
China has been making great progress on Chinese built EUV patterning machines.
Individual lack of critical thinking is a national problem then?
Threads are one major reason I like Zulip over Slack, but speed is another. I usually have two different instances open on my browser with no problems, and one of them has dozens of conversations going on at once.

Zulip is also one of the only apps I put on my iPhone, and it's straightforward and unobtrusive.

For some reason when I use Slack, the keys feel mushy. I think they're doing so much stuff in the background that my keystrokes get delayed.
> In Germany, for example, there are very strict restrictions around Nazi language and symbolism [4], and for good reason.

I feel that needs a bit of clarification. The reason nazi symbolism is restricted is because it is promoting an illegal political party. It is a disgusting ideology full of hate, but its symbolism isn't illegal because it is vile or hateful. The nazi party (NSDAP, and lot of other related smaller parties) has been ruled unconstitutional because it is explicitly against the German constitution. The same has been done with communist parties trying to overthrow the constitution, and you also have symbolism of the islamic state that is considered illegal.

My point is: the legal argument is based on the defense of the constitution, not on the fact that it is considered hate.

Germany also has regulation for hate speech, but that's not what is being used in the context of unconstitutional political parties.
Coronavirus by Age Group
Why the CBD market is booming
Try it. But don't go to /b/. Watch pol, but only observe for a while. Don't get offended, enjoy the liberty and range of ideas - there are goldmines there regularly. Also you'll read things there first, and a lot of things that will never be on the news. If you ignore the slide and shill threads, it's one of the best places on the net right still.
It is easy to see zero-sum as noncooperative but in reality there is more than one winner. In fact, the number of losers is relatively small. One thing you can do to ensure your own position is to find some people you like and trade feedback with them. Everyone not included in the deal will have less feedback and you will be slightly advantaged over them.
> There is just something deeply satisfying about a mullet

For anyone that has never had a mullet, I wholeheartedly agree. Gotta do it once in your life!
Saturated addition is indeed the correct way to add two PCM streams together.

Especially back in the 1980s and 1990s you'd get awful code that did things like averaging the two streams because wrapping sounds awful and the authors were ignorant of the theory and/or unaware that saturated addition is a thing.

You can tell when somebody did this because it means playing silence makes everything else quieter, or worse there's an arbitrary limit on how many streams are played and playing any one thing is very quiet because it's attenuated so as to never wrap.

Haiku the 1990s-style operating system did this for years, as did various Amiga music software.
I see a gaze dot. It just seems kinda like Safari is accumulating some tracking error that Firefox doesn't. Both browsers find my face accurately.

(side note: when the gaze dot overlaps the calibration circles, the circles become unclickable without some very careful fiddling)
bhyve PCI passthrough worked great for me, but couldn't handle suspend-resume of the host. Less than ideal for a laptop. https://www.davidschlachter.com/misc/t480-bhyve-wifi-pci-pas...
"There is no normal life that is free of pain. It’s the very wrestling with our problems that can be the impetus for our growth."

-Fred Rogers
I think that's true and is definitely part of the larger discussion; when a platform has the power to begin a war; maybe more eyes should be focused on the responsibility of the platform.
I once had a manager give me an FDN rating and when I asked what I can do to improve she told me "just keep doing what you're doing".
> Do you trade?

The more relevant question is "does the SEC employ people aware of the various techniques available", to which the answer is "of course".
FTFY:

> If x% of software engineering work is making child porn websites

The issue prompting ACAB (as I understand it) isn't so much "how many cops are bigots" (personal racism) as "how much of the work cops do is racist" (structural & systemic racism).

There's still a degree that as part of a social group with someone, I'm complicit in who they are a person - the German "ten people and a nazi" saying.