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st: tetrachoric correlation
Thanks Austin, Maarten and Daniel. However, I am still having difficulties.
When I write matrix list r(Rho), the answer is matrix r(Rho) not found.
When I use the following procedure:
matrix C = r(Rho)
local n = r(N)
factormat C, n(`n')
the answer is: matrix C has missing values.
I donīt know what is happening, since the codebook shows that there is no missing values.
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