Stata First Observation In Group, > > I would like to know how to identify the first observation of > variable “X” for each firm in the panel ?. Or alternatively, you want to pull the last observation from I wonder if there is any way I can generate a count variable within each id-group, where the first observation gets the number 0, the second 1 and so forward? I can only seem to find I'd like to create a new variable that takes a value of 1 for all observations in a group if, for any of the observations in the group, X is true. Like in the first Referencing First Value of Each Group 24 Jan 2018, 08:34 Hi, My goal is to drop the first five years of all observations of those stocks that have no "offerdate". After using xtset id year, I want to calculate, for each id, the difference between the value of effect in each year and the value in the first year. In all other observations in the id group, it will be set to I've looked into the [_n-1]<1 (and [_n+1]>1 respectively), but this only specifies one previous (or later) observation, I want to specify all previous (or later) observations. here's code with an example of where situations exist where: A is missing but it is the only obs by id and date, and A and B are both missing for a id Question I have a dataset, and I wish to work with a subset of observations, and that subset is defined by a complicated criterion. Thus [1] denotes the first observation, and [_N] denotes the last observation For each matrix S`i', I want the input to be the first observation of the variable within that id. The essence of Erik's difficulty is the need to look in other observations for the same panel to produce the new variable. The problem is that these observation > are in reverse order, ie the last Keeping only the first observation 08 May 2017, 03:42 Dear Stata Users, I have a small challenge. This process requires an understanding of the use Trying the same command with an integer variable You want to pull the first observation for each group into a new data frame.

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