Comparing date intervals of similar observations, linked by an ID within same dataset

[x2PSx]

Hello,

I have one dataset with 12992 observations. I have (half) 6496 different IDs, so 6496 pairs of observations. What I want to do is to compare date intervals within each pair to make sure they don't overlap eachother for the same ID. The dates variables are DATE9. format and informat.

So basically 3 variables: ID, DATE_BEGIN, DATE_END. I am not sure how to proceed with this.

Thank you

[Reeza · Accepted solution]

1. Sort your data so that its consecutive ids

2. Use LAG() to get the previous values

3. Check for overlap

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@x2PSx wrote:

Hello,

I have one dataset with 12992 observations. I have (half) 6496 different IDs, so 6496 pairs of observations. What I want to do is to compare date intervals within each pair to make sure they don't overlap eachother for the same ID. The dates variables are DATE9. format and informat.

So basically 3 variables: ID, DATE_BEGIN, DATE_END. I am not sure how to proceed with this.

Thank you

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[x2PSx]

I just did, thank you!