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Originally Posted by BlingDaddy
Going from 1:300 to 1:2100 is ridiculous.
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Why on earth would a fluctuation in a time series variable describing a random event (signup) be ridiculous? It is absolutely normal for ratios to vary. The lower your average sample size (# of sales in a period) the higher the fluctuations.
The McDonald's around the corner might have 8000 customers on a given Friday night. The Friday the week after they only had 4000 customers. 50% drop. I guess they're being shaved.