Dirk Enzmann wrote:
> The command tab2 generates crosstables displaying different information
> in its cells (a.o. counts, row- and column-percentages). What can I do
> to have additionally a display of adjusted standardized residuals? Is it
> possible to extend the options of tab2 (or writing an ado that uses
> tab2) such that adjusted standardized residuals can be displayed?
>
> Note: Up to now I never did programming in Stata.
-tab2- is a caller of -tabulate- and can therefore not be rewritten to display
quantities that are not part of -tabulate- itself. If you want to write a
program you need to start from scratch, I am afraid.
I don't know whether I found the formula you had in mind, but a starting
point could be a solution that starts with -poisson-:
-----------------------------
sysuse auto, clear
// Make Frequence Data of 2 way table
contract rep78 for, freq(n) nomiss
fillin rep78 for
replace n = 0 if _fillin
drop _fillin
// Estimate "Independence Model"
xi: poisson n i.for i.rep78
// Calculate Expected Frequency of Independence Model
predict nhat
// Calculate Residual
gen res = n - nhat
// Calculate standardized residuals (check Formula?)
gen res_s = res/sqrt(nhat)
// Calculate adjusted standardized residuals (check Formula?)
gen N = sum(N)
replace N = N[_N]
by rep78, sort: gen na = sum(n)
by rep78: replace na = na[_N]
by for, sort: gen nb = sum(n)
by rep78: replace nb = nb[_N]
gen res_as = res/sqrt(na * nb * (1-na)/N * (1-nb)/N) // <- Adjusted?
// Table with observed freq, expected freq, raw, standard., adjusted
tabdisp rep78 for, cellvar(n nhat res res_s res_as)
Hope that helps
Uli
--
kohler@wz-berlin.de
+49 (030) 25491-361
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