How to run multivariate foreach loop

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I would like to run a multivariate loop in Stata to rename many variables.

The following code is how i would imagine it would work:

local varlist1 "x1 x2 x3 .... xn" 
local varlist2 "a b c .... n" 

foreach i in local `varlist1' & j in local `varlist2' {
rename `i' `j'
}

The objective of this would be to rename x1 to a and x2 to b and so on.

Is there a way to do this?


You should not need a loop at all as

rename (x1 x2 x3 xn) (a b c n) 

is perfectly legal, given some constraints on whether the new names are in use for other variables.

Given interest in loops, here's another slow way to do it:

local new a b c n 
foreach old in x1 x2 x3 xn { 
    gettoken this new : new 
    rename `old' `this' 
} 

Here new is treated as a stack: each time around the loop, we take off the top item and do not replace it.

R: Fast and efficient way of running a multivariate regression across , This isn't exactly what I would call advanced but running each regression on a separate core in a parallel foreach loop would help. The open brace has to be on the same line as the foreach, and the close brace must be on a line by itself. It’s crucial to close loops properly, especially if you have one or more loops nested in another loop.-local-: define macro. This was a rather simple repetitive task which can be handled solely by the foreach command.


Consider the following toy example:

clear
set obs 1

forvalues i = 1 / 3 {
    generate x`i' = runiform()
}

list

     +--------------------------------+
     |       x1         x2         x3 |
     |--------------------------------|
  1. | .3913819   .1196613   .7542434 |
     +--------------------------------+

Here's one way to do what you want:

local varlist1 "x1 x2 x3" 
local varlist2 "a b c" 

tokenize `varlist2'
local i 0
foreach var1 of local varlist1 {
    local ++i
    rename `var1' ``i''
}

list

     +--------------------------------+
     |        a          b          c |
     |--------------------------------|
  1. | .5844658   .3697791   .8506309 |
     +--------------------------------+

The idea here is to break up the local macro varlist2 in separate arguments 1, 2, 3 etc. and then move through them using a counter local macro i.

Alternatively, you can simply do:

local varlist1 "x1 x2 x3" 
local varlist2 "a b c" 

rename (`varlist1') (`varlist2') 

or:

rename x# (`varlist2')

Creating loop for multivariate regressions for each value of a , Hi all. I am working with a dataset that has 10 explanatory variables (x1-x10). I want to run regressions of y on x1-x9 for each values of x10. A friend asked me whether I can create a loop which will run multiple regression models. She wanted to evaluate the association between 100 dependent variables (outcome) and 100 independent variable (exposure), which means 10,000 regression models.


One possible solution, certainly not the most elegant way, is to use the extended macro function word i of. A sample solution is:

local varlist1 "x1 x2 x3 .... xn" 
local varlist2 "a b c .... n" 

local numitems = wordcount("`varlist1'")

forv i=1/`numitems' {
    local old_name : word `i' of `varlist1'
    local new_name : word `i' of `varlist2'
    rename `old_name' `new_name'
} 

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for and foreach loops in Perl : CodesDope, Start from basic and ask your doubts and questions : CodesDope. In foreach loop also, we use a variable to take the value of every element of the array. Now I want to make 4 separate regressions for each time period one using the foreach/forval function. I tried the following: forval i=105/108 {regress var1 var2 if congress== 'i'} unfortunately this does not yield to the right result, as Stata still runs the regression on all time periods combined. Thanks a lot for you help. Best Luk


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