GENERATING DUMMY VARIABLES You may often need to generate dummy variables to use in a regression Dummy variables (also commonly called "indicator variables" or "binary variables") take on two values: 0 and 1 You can create a dummy variable using either a single command or two commands
Stata Manual
Dummy variables are created automatically By default, the dummy-variable set is identified by dropping the dummy corresponding to the smallest value of the variable (how to specify otherwise is discussed below) The new dummy variables are left in your dataset
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A categorical variable identifies a group to which the thing belongs You could categorize persons according to their race or ethnicity, cities according to their
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17 fév 2006 · To create a dummy variable that is 1 if male, 0 if female, type: variables in the regression i sex tells Stata that you want it to include a dummy
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Stata then creates dummy variables “on the fly”, one per value of the original variable Stata transforms any discrete variable into a series of dummies, one for each
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Here are a few syntax lines that take the female dummy variable created by the tabulate/generate command (above), rename it, add a new variable label, and
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We need to create group dummy variables, also known as indicator variables One way to do this in Stata is with the xi command (xi is especially convenient if
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Dummy variables – where the variable takes only one of two values – are useful command to create interaction term */ Stata will create two dummy variables
use and interpretation of dummy variables
We (wisely) told Stata to generate the new variable agecat as a byte thus conserving memory. We can create the same result with one command using the recode()
by creating new variables and in the second syntax (xi: any stata command)
We (wisely) told Stata to generate the new variable agecat as a byte thus conserving memory. We can create the same result with one command using the recode()
If you have two or more categorical variables you may want to create one composite categorical variable that can take on all the possible joint values.
THE GENERATE COMMAND. CREATING DUMMY VARIABLES. REGRESSIONS. LINEAR REGRESSION. PROBIT MODELS. WRITING A PROGRAM: DO-FILES. RECORDING OUTPUT: LOG FILES.
21 sept. 1983 The term “dummy variable” for a variable encoded with values of 0 and 1 seems to have arisen around 1950 in statistical science. Freedman (2009 ...
14 sept. 2011 Stata's regress command runs a simple OLS regression ... To create dummy variables based on categories of another variable use the tabulate ...
xi [ prefix(string) noomit ] : any stata command varlist with terms . creates dummies for categorical variables varname1 and varname2:.
(interaction expansion) to automatically generate dummy variables. 21. NOTE: In Stata 11 you do not need. “xi:” when adding dummy variables.
Three way crosstabs (with average of a fourth variable). ?. Creating dummies. ?. Graphs. ? Scatterplot. ? Histograms. ? Catplot (for categorical data).
25 Working with categorical data and factor variables