st: oblong correlations with makematrix

[Kit Baum <baum@bc.edu>]

As noted, cpcorr can generate oblong correlations, but applies listwise 
deletion on this hacked version of auto.dta:

. cpcorr price headroom \ displacement turn
(obs=64)

          displacement          turn
   price        0.5174        0.2990
headroom        0.4758        0.4369

"cpcorr2" includes my suggested pairwise option and does pairwise 
correlations:

. cpcorr2 price headroom \ displacement turn, pair
(obs=74)

          displacement          turn
   price        0.4916        0.3015
headroom        0.4792        0.4303

As Nick Cox notes, it is not necessary to build this feature into 
cpcorr, as it is feasible to generate those pairwise correlations using 
his 'makematrix' routine:

. makematrix, from(r(rho)) cols(displacement turn) listwise: corr price 
headroom

          displacement          turn
   price     .49158291     .30145184
headroom     .47921817     .43027963


Kit Baum, Boston College Economics
http://ideas.repec.org/e/pba1.html

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