st: too many macros?!

[Rufus Peabody <rufus.peabody@gmail.com>]

I ran the following code, but got the error message "too many  
macros".  What I'm trying to do is create a macro that includes the  
regressors to use for that specific time through the loop.  It  
includes a different number of regressors each time.  For each  
"tm_gmid_yr" I'm looping through, I  want the regressors to be all  
lags possible within that year (by week--so L`i'., L`i+7'.,..., where  
i is based on the remainder when dividing "tm_gmid_yr" by 7 ).   
Anybody have any idea how to get around this problem?

local mark=mark
forvalues year=2000/2007 {
	forvalues tm_gmid_yr=7/156 {
		foreach v of local ratevars {
			cap gen `v'_norm_pred=.
			cap gen `v'_norm_pred2=.
			tempvar pred1 pred2
			local regressors "lweek_`v'_norm"
			local x=mod(`mark',`tm_gmid_yr')
			local regressors "`"`regressors' L`x'.lweek_`v'_norm"'"
			local y=floor(mark/7)
			while(`y'>=1) {
				local num=(7*`y')+`x'
				local regressors "`"`regressors' L`num'.lweek_`v'_norm"'"
				local y=`y'-1
			}
			regress nweek_`v'_norm `regressors' if tm_gmid_yr<=tm_gmid_yr+7 &  
tm_gmid_yr>=tm_gmid_yr-7 & year<=`year'
			predict `pred1' if year==`year' & tm_gmid_yr==`tm_gmid_yr'
			regress nweek_`v'_norm `regressors' if year<=`year'
			predict `pred2' if year==`year' & tm_gmid_yr==`tm_gmid_yr'
			replace `v'_norm_pred=`pred1' if year==`year' &  
tm_gmid_yr==`tm_gmid_yr'
			replace `v'_norm_pred2=`pred2' if year==`year' &  
tm_gmid_yr==`tm_gmid_yr'
			drop `pred1' `pred2'
		}
	}
}
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