Drivetrain is always limited during events (Asphalt myth)

The claim that Drivetrain cards are always limited during events in Asphalt 8 is a special case of the common belief that the game grants less of the cards needed to upgrade an event vehicle.
== Assumption ==
Especially during events, players are focused on obtaining Pro Kit cards for the vehicle offered by the event. As the majority of vehicles are speed based, the most useful cards are Drivetrain (increasing top speed and acceleration) and Tires (increasing top speed and handling). There have been several reports of players not obtaining Drivetrain cards during an event,Asphaltforfu (2019-06-22). Comment and replies. Retrieved on 2019-06-22. so it is possible that there is a corresponding mechanism in the game that decreases the frequency of Drivetrain cards needed by an event vehicle.
== Test ==
To verify this, a valid method would be to oberve the relative frequency of Drivetrain cards during a longer period that includes phases both with and without events.
As a sample for this test, the database of WikiProject Statistics has been evaluated from the start of the Fast Lane Update until the end of the 2019 Spring Update. The observed Pro Kit Boxes were Daily Kit Box, Engine Box, Extra Box, Finish Line Box, Multiplayer Pro Box, Optimal Shuffle Box, Optimal Split Box, Random Box, Starter Box, Tech Box, and Ultra Box which are the most common ones.
If the assumption was true, the relative frequency of Drivetrain cards during events should be significantly lower than during periods without events.
Note:
* Dedicated yellow Parts boxes like the were not included because there was no statistical data available for this period. Some of these boxes had indeed an unfair distribution, but independently from ongoing events.
* This was fixed on June 28, 2019 (see ).
== Results ==
 	Events 	Events 	No events	No events
 	Cards 	Rel. frequency	Cards 	Rel. frequency
Sample size 	5,606 	100 % 	1,232 	100 %
of which: 	of which:	of which: 	of which:	of which:
Drivetrain D	188 	3.35 % 	47 	3.81 %
Drivetrain C	174 	3.10 % 	48 	3.90 %
Drivetrain B	180 	3.21 % 	45 	3.65 %
Drivetrain A	136 	2.43 % 	31 	2.52 %
Drivetrain S	183 	3.26 % 	28 	2.27 %
Total 	861 	15.36 % 	199 	16.15 %
As there aren't many periods without events in Asphalt 8, the corresponding sample size is smaller, but still large enough for the law of large numbers to minimize the effects of outliers. To make the results comparable, the table also lists the corresponding relative frequencies.
For all classes, the relative frequencies of Drivetrain cards during event and no-event periods are extremely similar.
* The total of all classes differs only by which is less than 1 card out of 100. This is within the normal range of deviations during random processes.
* There is a tendency of event periods granting slightly less Drivetrain cards than no-event periods for class D to A, but the differences only range from (less than 1 card out of 1,000) to (less than 1 out of 100).
* The relative frequency of Class S Drivetrain cards is even higher during events, but also only by .
There are no significant differences between no-event and event periods.
== Conclusion ==
There is no mechanism that decreases the frequency of Drivetrain cards during events. The assumption is wrong.
This doesn't contradict the observations of some players who had a longer streak of getting no Drivetrain at all. As the Pro Kit Box process is random, it is possible that a no-Drivetrain streak occurs. There is no guarantee that
* a streak of no Drivetrains will immediately be "balanced" by an increased number of Drivetrain drops ("gambler's fallacy"), or that
* a small number of observations will coincide with official drop rates (=expected values).
== See also ==
* Myths – a list of "Asphalt myths" with explanations.
== References ==
Category:Asphalt myths
Category:Studies (WikiProject Statistics)