Hi,
Is there a smart way to calculate the standard deviation of var1 for
each id in each year, based on past 5 years' data. For example, for id
18 in year 1996, i want to calculate the st dev of var1 for the past 5
years 1991-1995 (here 3 data points). then, for id 18 in year 1998, i
want the st dev for var1 for the past 5 years 1993-1997; and then year
2000; and next id, and so on.... i have a large number of id's and
year's. many thanks, aaron.
id year var1
18 1993 5.684
18 1993 18.80
18 1994 6.482
18 1996 5.99
18 1998 9.887
18 1998 78.52
27 2000 53.51
41 1983 1.969
71 1997 9.216
74 1995 1.758
74 1997 9.501
74 2001 15.89
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