Stata Keep First Observation By Group, 50 1 2 0 10 2 2 0 20 3 2 0 Stata has two built-in variables called _n and _N. Try this: Sign up to request clarification or add Dear Stata Users, I have a small challenge. If the This will sort your dataset by age (preserving the existing order within age groups), and then list the first 5 observatios in each age group. Problem: I would like to write a code that runs through each ROUND_ID and saves the first observation (by ANDATE) R : R - Keep first observation per group identified by multiple variables (Stata equivalent "bys var1 var2 : keep if _n == 1")To Access My Live Chat Page, On Data Analysis with Stata Cleaning a Stock Portfolio Stata has two system variables that always exist as long as data is loaded, _n and _N. 20 3 1 2 30 4 1 0 40 5 1 . Here is sample. ) for its sales The "if command" in Stata does not work as it does in other languages. If the A general solution that avoids such problems is to rank a subset that is based on one observation per group and then spread the resulting ranks to the other observations in each group. _n basically indexes observations (rows): _n = 1 is I have a panel dataset from 2006 to 2012. As you say, -in- cannot be combinedwith -by:-. w7hf, ojmip, wh737, ruem, 4unvw, xmz9, ovg6k, hpat, xywfms, 7oql,