What does == in Stata mean?
Table of Contents
What does == in Stata mean?
Double equal
Double equal: Test for equality The double equals, ==, is used to test for equality. It is sometimes called logical equals because it is part of a logical test that returns either a one (true) or a zero (false).
What does Egen do in Stata?
The Stata command egen, which stands for extended generation, is used to create variables that require some additional function in order to be generated. Examples of these function include taking the mean, discretizing a continuous variable, and counting how many from a set of variables have missing values.
What does _n mean in Stata?
the current observation number
_n is Stata notation for the current observation number. _n is 1 in the first observation, 2 in the second, 3 in the third, and so on. _N is Stata notation for the total number of observations.
Can you do two if statements in Stata?
You can combine several statements under an if statement, but the whole block will either be executed or skipped. I recommend that you see [P] if or help ifcmd. if statements can be nested. An if statement can optionally be followed by an else statement.
What is Strpos in Stata?
Description. strpos(haystack, needle) returns the location of the first occurrence of needle in haystack, 0 if needle does not occur, or 1 if needle is empty. strrpos(haystack, needle) returns the location of the last occurrence of needle in haystack, 0 if needle does not occur, or 1 if needle is empty.
What does Varlist mean in Stata?
a list of variable names
In this diagram, varlist denotes a list of variable names, command denotes a Stata command, exp denotes an algebraic expression, range denotes an observation range, weight denotes a weighting expression, and options denotes a list of options.
What is Subinstr Stata?
subinstr(s, old, new) returns s with all occurrences of old changed to new. subinstr(s, old, new, cnt) returns s with the first cnt occurrences of old changed to new. All occurrences are changed if cnt contains missing.
What does it mean to Destring in Stata?
Description. destring converts variables in varlist from string to numeric. If varlist is not specified, destring will attempt to convert all variables in the dataset from string to numeric. Characters listed in ignore() are removed.
