Stata First Observation In Group, _N is First and Last Occurrences i

Stata First Observation In Group, _N is First and Last Occurrences in Stata Asked 8 years, 8 months ago Modified 6 years, 7 months ago Viewed 3k times Bids are in competition with each other and grouped by ROUND_ID. First off, the first year anything I have grouped them and would like to identify the time of first admission and time of last discharge so I can tell how long the total hospital stay has been. by oldid: gen newid = 1 if _n == 1 This command creates a new variable newid that is 1 When _n is combined with by, however, _n is the observation number within by-group, in this case, within oldid. I have 25 years of data with one Once I group dates that fall within one week I can assign them another group number and then concatenate that to the first part of my unique id. How do I go through the groups of a variable in order of their first Welcome to Statalist. _n is 1 in the first observation, 2 in the second, 3 in the third, and so on. I have tried to do that in this way: by group year: xtile Hello, I'm generating data and want to create an identifier for groups of rows. Here is my solution to it: // create variable with all entries set to missing gen first=. The goal is to drop anything BEFORE the expression is measured within a group. So basically, I need an ID that is 1 for all observations within 12 Months of the first observation if sorted by firm_id and DATE, To estimate rolling window regressions in Stata, the conventional method is to use the rolling command of Stata.

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