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Returns the mean of gpa of each id by semester. stat options include mean, median, percentiles, standard deviations, standard errors, first/last values, maximum/minimum etc. reshape long changes it back to the long format.Ĭollapse ( stat1) varlist1 ( stat2) varlist2…, by( group varlist) aggregates the dataset to summary statistics. | id semester gpaA attend~A gpaB attend~B | J variable (2 values) course -> (dropped) gen priceIndicator = (price >= 5000 & price wide Label values var labelname then matches the labels to the values. Label define labelname # label # label … first creates a label name for all the labels we are going to attach to the variable values. Label define and label values attach value labels to a numeric variable in two steps: Rename oldvar newvar renames the variable name.īack to top label define label values label list label drop Label variable varname “label” attaches a label to a variable. We have met the first two in the previous chapter, but for convenience let’s review them altogether here. These three commands provide additional information to a variable. price and price are explicit subscripting that tells Stata where to refer to.īack to top label variable rename notes Recodes the numeric variable price into a variable of three categories ranging from its minimum to the maximum value. gen price3 = autocode(price,3,price,price) Generate newvar = autocode( var, n, a, b) recodes the numeric variable var into a categorical variable newvar with n equal-length intervals a and b are the two boundaries where a is inclusive. +-+-Īnother way to convert numeric variables to categorical or factor variables is to use autocode, the automated version of recode. Repair | RECODE of rep78 (Repair Record 1978) To check if the transformations have worked as we would like them to be, it is always a good idea to cross-tabulate the newly defined variables and the variables created from. Label() gives a name to the new value label. If there are values unassigned, they will be taken to the new variable as they are.Ĭontents following the assigned value is the value label (e.g. Missing indicates all missing values nonmissing for all nonmissing values and else for both missing and non-missing values. Min refers to the smallest value max refers to the largest value.
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Numbers to the left of = are values to be recoded, while the number following = is the new value to be assigned. Values specified in the () includes the two boundaries. ), gen(rep78_scale) label(repair_record_scale) Recode var (rule)., generate( newvar) changes the contents of numeric variables, usually to create categorical variables. replace price2 = price*0.8 if foreign = 1 It can be used in combination with generate to recode the newly created variable from the existing numeric variable. Replace changes the contents of a variable. Generate newvar = exp creates the new variable from existing variables through an expression. The four commands are often used to create or change the contents of variables.
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Managing Your Data generate replace recode autocode