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ay99
2010 Jun 28
1
Subtraction loop
I have a data frame with 2 columns, one for day and one for average.
The day starts at 97 all the way to 279. I want to subtract day 98
average- day 97 average, then day99 average -day 98 average and so on
down my list, creating another column with the subtracted results.
I have:
Day DailyAverage
1 97 0.6076782
2 98 0.7121478
3 99 0.8059347
4 100 0.9545806
5 101 1.0589791
6 102 1.1335981
7 103 1.2676922
8 104 1.44298...