Data sampling can be very damaging for your analysis If you have got data sampling issues, any or all of your reported metrics from: ‘sessions’, ‘users’,’pageviews’, ‘bounce rate‘, ‘conversion rate’, to ‘revenue’ could be anywhere from 10% to 80% off the mark. For example, Google Analytics may report your last month’s revenue to say $1.2 million when in fact it is only $950k.