What is Unab Stata?
unab is a low-level parsing command. The syntax command is a high-level parsing command that, among other things, also unabbreviates variable lists; see [P] syntax. The difference between unab and tsunab is that tsunab allows time-series operators in varlist; see [U] 11.4.
What is a stub in Stata?
stub(stub) specifies that fvrevar generate named variables instead of temporary variables. The new variables will be named stub#. Remarks and examples. stata.com.
What does _ALL mean in Stata?
program drop
program drop _all. (see [P] program) clear ado eliminates all automatically loaded ado-file programs from memory (but not programs. defined interactively or by do-files). It is equivalent to typing.
What does Rclass mean in Stata?
rclass states that the program being defined returns results in r(). This is done using the return command; see [P] return. If the program is not explicitly declared to be rclass, then it may not change or replace results in r().
What is capture in Stata?
capture executes command, suppressing all its output (including error messages, if any) and issuing a return code of zero. The actual return code generated by command is stored in the built-in scalar rc. capture can be combined with {} to produce capture blocks, which suppress output for the block of commands.
What does J mean in Stata?
j new variable. To go back to long after using reshape wide: reshape long.
What does Mvdecode mean in Stata?
mvdecode changes occurrences of a numlist in the specified varlist to a missing-value code.
What does clear mean in Stata?
“clear” tells Stata to erase the previous dataset.
What does _B mean in Stata?
Post-estimation commands in Stata _b[] for categorical variables. stata. EDIT: a working example is provided further down. ORIGINAL: A post estimation command can be used to predict the value of the dependent variable. Here is an example, where you can type _b[_cons] + _b[x1]*1 + _b[x2] to get an actual value of Y.
What does R () do in Stata?
return list lists results stored in r(). ereturn list lists results stored in e().
What is the capture command?
The capture command allows a user to dump everything printed on the user’s terminal to a file. The screen is printed to the file specified by the File parameter or to the screen. out file if no file is specified. If the -a flag is specified, the capture command appends the contents of the screen to the file.
What does _n mean in a Stata report?
(Stata interprets _N to mean the total number of observations in the by-group and _n to be the observation number within the by-group.) Having created the new variable dup, you could then to see a report of the duplicate count. To base the duplicate count solely on name, type
How do I use UNAB in a macro?
The use of unab is a trick; it puts the names of every variable in the dataset in the macro vlist . In the last two lines, note that you type `vlist’, which is to say, left single quote, the word vlist, right single quote.
How do I report on duplicate observations in Stata?
Starting with Stata 8, the duplicates command provides a way to report on, give examples of, list, browse, tag, or drop duplicate observations. This FAQ is likely only of interest to users of previous versions of Stata. You wish to create a new variable named dup.
Can multiple imputation give unbiased estimates with Mnar data?
In theory multiple imputation can give unbiased estimates with MNAR data, but only if the imputation method includes a model of the missingness mechanism. You’d need to code such a method yourself; it cannot be done using mi impute, ice, etc. In practice, if your data are MNAR it’s going to be very hard to carry out legitimate analysis.