Thanks! Hey, one more thing came up. I need a new variable that is x3 but lagged two years. That's to say, the value of x3 in year 1 would be in year 3. I can't use plain lag function because it interrupts the order of later ages after the 1st age. So basically the first two years in each age should be missing. I'd rather have a new variable and not mess the original x3 since I will need both.
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