Dear List
I tried to post this yesterday but dont think it worked.
The following program is one for a sample size calculation. I am not
using sampsi because I want to extend the program later. However, on
running it in stata it returns an error which I can't seem to spot at
the moment.
program define sampsi1
version 7.0
syntax [, ZAlpha (real 1.645) ZPower (real 0.8416) HRatio (real 1.5)
Censor (real 0.8) PControl (real 0.5)]
if "`ZAlpha'"=="{
ret local errmess "zalpha required"
exit 198
}
if `zalpha'<=0 {
ret local errmess "zalpha() out of range"
exit 198
}
if "`ZPower'"=="{
ret local errmess "zpower required"
exit 198
}
if `zpower'<=0 {
ret local errmess "zpower() out of range"
exit 198
}
if "`HRatio'"=="{
ret local errmess "hratio required"
exit 198
}
if `hratio'<=0 {
ret local errmess "hratio() out of range"
exit 198
}
if "`CEnsor'"=="{
ret local errmess "censor required"
exit 198
}
if `censor'<0 | `censor'>1 {
ret local errmess "censor() out of range"
exit 198
}
if "`PControl'"=="{
ret local errmess "pcontrol required"
exit 198
}
if `pcontrol'<0 | `pcontrol'>1 {
ret local errmess "pcontrol() out of range"
exit 198
}
tempname N0 N1 N2 N
scalar `N0' = (`ZAlpha'+`ZPower')^2
scalar `N1'=(log(`HRatio'))^2
scalar `N2'=`Censor'*`PControl'*(1-`PControl')
scalar `N'=`N0'/(`N1'*`N2')
return N=`N'
end
exit
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