On Thursday, August 28, 2003, at 02:33 AM, Kevin wrote:
I believe the below do-file should generate the data that SAS would
generate. The only problem I could not solve was how to get the last
observations exactly like it appeared in SAS. If you could explain
what the
below syntax does in SAS I believe I could recreate the results in
Stata.
BY INC,LN_MAX;
Below is the do-file.
clear
local logmax = log(360)
local inc = ((1+`logmax')/499.9)
local obs = 0
generate logtime = .
local logmax = `logmax' + `inc'
forvalues i = -1(`inc')`logmax' {
local obs = `obs' + 1
qui set obs `obs'
qui replace logtime = `i' in `obs'
}
gen months = exp(logtime)
gen year = months/12
This can (and probably should) be done without an explicit loop. Loops
are familiar to SAS users, but hardly appropriate in Stata's syntax:
clear
set obs 501
scalar logmax = log(360)
g obs = _n
g double inc = -1
replace inc = ((1+logmax)/499.9) in 2/l
g double logtime = sum(inc)
g double year = exp(logtime)/12
list in 499/l
Kit
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
