If I have a dataset as follows:
Date. Profit
Jan 1. $100
Jan 2. $200
Jan 3. $150
How can I calculate the daily change in profit, so that the new data set is as follows:
Date. Profit Variance-from-prior-day
Jan 1. $100. .
Jan 2. $200. $100
Jan 3. $150. -$50
Thanks!!
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