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st: scalar and calculations


From   "Tomas Lind" <tomas.lind@ki.se>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: scalar and calculations
Date   Fri, 16 Apr 2010 16:11:49 +0200

Dear listers,


Scalar can´t do calculations?


I am trying to do some simulations. In a simplified version of my code, this
works (part of code shown) where n is sample size:

scalar v = r(mean) 
return scalar v2 = (`v'+2) * `n'		// No error messages

But this does not work:
scalar v = r(mean) 
return scalar v2 = (`v'^2) * `n'		// Error, ^2 invalid name


This is part of the full code and I get an error for ^2.
summarize ln_large
scalar v = (r(sd)^2)/2
return scalar mlk = exp(r(mean)) * (1 + ((`n'-1)/`n') +
 ( ((`n'-1)^3)/(`n'^2*(`n'+1)*2*1 ) ) * (`v'^2/(    2*1) )  +
 ( ((`n'-1)^5)/(`n'^3*(`n'+1)*(`n'+3)*3*2*1 ) ) * (`v'^3/(  3*2*1) )  + 
 ( ((`n'-1)^7)/(`n'^4*(`n'+1)*(`n'+3)*(`n'+5)*4*3*2*1 ) ) * (`v'^4/(4*3*2*1)
) )

How shall I do to calculate the value for mlk?


/Tomas


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