We have a tradition of telling Statalist members about new releases of
Stata before anyone else, so here it is:
I am pleased to be the one to announce the release of Stata 9.
Stata 9 begins shipping on April 27th.
Highlights include
o New matrix language Mata, with 620-page manual.
Mata is a full-blown matrix programming language that compiles
what you type into byte-code, optimizes it, and executes it fast.
You can use Mata interactively, or you can use Mata to implement
big systems. We used Mata to implement many of the new features
of Stata 9.
o New survey features, including balanced repeated replications
(BRR) and jackknife variance estimates, multistage designs, and
poststratification.
o Linear mixed models, including two-way, multilevel, and
hierarchical random-effects -- random intercepts and
random coefficients.
o Multinomial probit models, including support for several
correlation structures and support for user-defined correlation
structures.
o Probit and tobit with endogenous regressors, including
maximum-likelihood and two-step estimators.
o Stereotype logistic regression (relaxes the assumption of
proportional odds).
o Zero-truncated Poisson and negative binomial.
o Multivariate analysis, including multidimensional scaling,
correspondence analysis, biplots, tetrachoric correlations, and
Procrustean analysis, along with the ability to analyze proximity
matrices and raw data.
o Seasonal ARIMA models, including robust standard errors.
o Nonlinear least squares that is now as easy to use as linear
least squares, and including clustered-robust standard errors.
o Bootstrapping and jackknifing that is easier to use, including
full VCE estimates. (You can now just add -vce(bootstrap)- or
-vce(jackknife)- to your estimation command.)
o XML support.
o Enhanced GUI, including multiple Do-file editors, multiple
Viewers, multiple Graph windows, all of which can move outside
the main Stata window; multiple windowing preferences; dockable
windows; copy text to HTML; etc.
o More 64-bit support, including 64-bit Windows and 64-bit Linux on
Itanium, Opteron, Athlon 64, and EM64T. (Still available are
AIX, IRIX, Solaris, and Tru64.)
I've just given the highlights. Other features include rolling and
recursive regressions; robust and clustered-robust SEs for random-
effects and fixed-effects regression; mean, ratio, total, and proportion
estimators for groups with full VCE; paired-coordinate plot types;
value labels up to 32,000 characters, etc.
For more information, visit http://www.stata.com/. You can order
from there, or you can send email to [email protected].
Just do not send email directly to me -- [email protected]. I'm heading
off to the German users meeting and will not see your email until I
return.
-- Bill
[email protected]
P.S. Every time I announce a new release, a few people are concerned
that, having just bought Stata, they need to buy again. Not true.
There is special upgrade pricing for those who purchased recently.
The rule is simple: if you purchased in January, February, March,
or April, you get the upgrade for the difference in cost, and
there is a discount for those who purchased in December.
In these special cases, the easiest way to order is to call
1-800-STATAPC or send email to [email protected].
Of course, you can always call or send email if you have
questions.
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