I recently downloaded the following program to compute moving averages. I have never used a nonstandard stata program before and cannot get it to work. I created a folder c:\ado\personal and copied the code into a file named mavg.ado. I have version 7 of stata if that makes a difference. I get an error when stata tries to load the command. Any ideas?
thanks!
mavg <varname>, generate(<newvarname>) t(n)
Where n is the number of preceding observations you want to average.
/* mavg begins here */
program mavg
version 8.0
syntax varname(numeric) , Generate(string) t(string) [missing]
capture confirm new variable `generate'
if _rc {
di as err "`generate' invalid new variable name"
exit 198
}
capture confirm integer number `t'
if _rc {
di as err "t() must be an integer"
exit 198
}
local k = `t' - 1
local N = _N
tempvar copyvar sumvar
qui gen double `copyvar' = `varlist'
if "`missing'" == "" {
qui replace `copyvar' = 0 if `copyvar' >= .
}
quietly gen double `sumvar' = .
*-------
* handle _n >= t
forvalues obs = 1/`N' {
local sum = 0
forvalues i = 0/`k' {
local sum = `copyvar'[`obs'-`i'] + `sum'
}
quietly replace `sumvar' = `sum' in `obs'
}
quietly generate `generate' = `sumvar' / `t'
*-------
* handle observations 1 - `t'
forvalues j = 1/`k' {
local sum = 0
forvalues i = 1/`j' {
local sum = `copyvar'[`i'] + `sum'
}
quietly replace `sumvar' = `sum' in `j'
quietly replace `generate' = `sumvar' / `j' in `j'
}
end
/* mavg.ado ends here */
*
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