I use it because once I've input formulae to calculate monthly totals, increases and declines, and conversion rates, I never have to do that math again. After that, I simply enter the raw data, and the spreadsheet does the calculations.
You may use any spreadsheet you are comfortable with, or you might prefer to use a calculator to do the math instead. That's up to you.
To help you understand and visualize the statistics recording and analyzing tasks, I've included tables below with statistical data from 3 products that I sell on one of my affiliate sites.
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