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Retrieve value for n days prior to each date

Retrieve value for n days prior to each date

Retrieve value for n days prior to each date

(OP)
Hi, I have a dataset as follows and I need to retrieve two things: 1) the sum of VALUE between (date-1) and (date-3) for each date and 2) whether, during the 5 days, there are >= two days where the VALUE is 0. I think PROC SQL should be used but I'm not sure how to implement this.

INPUT DATASET:

ID   DATE      VALUE
1   20110101     0
1   20110102     0
1   20110103     1
1   20110104     2
2   20110101     1
2   20110102     2
2   20110103     3
2   20110104     4

Output should be 1) 1 (0+0+1) for ID1, 20110104 and 6 (1+2+3) for ID2, 20110104. and 2) a mark for ID1, 20110104, since there are 2 days with a value of 0 during the 3-day window.

Any help is greatly appreciated!

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