### What's New in Stata 9: Mata

Here is information about Stata 9 Mata -- Matrix program

**
use http://www.ats.ucla.edu/stat/stata/notes3/hsb2, clear
mata
X = .
st_view(X,.,("read","math","science"))
meanx = mean(X, 1)
meanx
meanx'
varx = variance(X, 1)
varx
corx = corr(varx)
corx
Y = .
st_view(Y,.,("write"))
meany = mean(Y, 1)
xx = crossdev(X,meanx,X,meanx)
xy = crossdev(X,meanx,Y,meany)
b = invsym(xx)*xy
b = b \ meany-meanx*b
b
end
regress write read math science**

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