Mat Operation Stata Use Selected Observation To

This reminded me of my first statalist posting last year where i asked a similar question.

Mat operation stata use selected observation to. List the last ten observations you can use l for last and f for first. The default value of matsize is 400 for stata mp stata se and stata ic but you can reset this with the set matsize command. The if qualifier is a clause you tack onto a statement or program call such as in your example. First you need to understand the distinction between the if statement and the if qualifier.

Referencing cells observations in stata using brackets january 12 2010 earlier today there was a posting on statalist that asked about labeling a numeric variable with the words contained in a string variable. Selecting variables and observations with use the above sections showed how to use keep drop keep if and drop if for eliminating variables and observations. Anymatch in stata 9 and later releases is a replacement for eqany in stata 8 and prior releases. Using the transpose of a for the first matrix which also interchanged the names and so obtained the names shown.

14 1 2 matsize matrices are limited to being no larger than matsize matsize. The if and in keywords on a command can be used to limit the analysis on a selection of observations filter observations for analysis. By default stata commands operate on all observations of the current dataset. Sometimes you may want to use a data file which is bigger than you can fit into memory and you would wish to eliminate variables and or observations as you use the file.