To consider values at the end of each panel, we need to start at the end and work backward. By far, the easiest way to do this is just to reverse the sort order within each panel and then apply the same logic as before. You could change the sort order this way: Another way is to do it with gsort: Either way, you usually … See more I have panel data (or longitudinal data or cross-sectional time-series data). I wish to identify systematically the first (or last) occurrences of a … See more For this problem, there is a simple Stata solution, which will be revealed in a moment. More important, however, is how you can work out the … See more Let us be clear about what the problem is. With panel data, we have one or more panels with identifiers and a time variable. Thus a panel might look like this: Here the variable statetakes … See more Here the cumulative sum sum(state)will be 0 before the first occurrence, 1 at the first occurrence, and 1 or more thereafter. In the first panel, sum(state) would be 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, and it is characteristic of absorbing states … See more Web1. A single identifier needs to be created (which is quickly done). 2. It seems like a cumbersome piece of code compared to the single line of code in Stata. 3. On a medium-sized dataset (below 100,000 observations grouped in lots of about 6), this approach would take about 1.5 hours.
Stata FAQ: First and last occurrences in panel data
WebJan 20, 2016 · 2 Answers Sorted by: 5 The context is that you want to remove variable names from a string listing them. The subinstr () solution in the OP's answer works only if the text to remove occurs just once as an entire variable name, and does not occur as part of another variable name. WebIdentifying the first and/or last observation within a group is often an important step in data management. For instance, a dataset may contain medical discharge records for patients in which you are interested in each patient’s earliest visit. You would then be interested in the first observation within a patient ID after sorting by date. new way jefferson
Delete whole row - Statalist
WebJul 4, 2024 · However, in the data browser, Stata attached a date to the entry. Despite only telling Stata a time, my time_due variable has a date in the entry. What I want to do is delete the date in both variables, because I want to see the time difference between time_due and assign1_submission. So, I tried the following code: WebMar 2, 2024 · Otherwise, the example in #3 is one you can run yourself and look at the data alongside your computations. Otherwise the help and the manual entry for duplicates … WebJan 24, 2024 · egen max = max ( interval), by (ID) Then you subtract this value from the interval and the observations for an event following surgery will have the value 0 (for obvious reasons): gen last ... mike cooper attorney hamburg ny