What's New in Stata 9: Other Features

Non-statistical new features

There are many new features of Stata 9, among them we will mention a few here:

*exploring command mean
use http://www.ats.ucla.edu/stat/stata/notes/hsb2, clear
mean write read math
mean write math, cluster(ses)
mean write, over(female)
test [write]female = [write]male
*exploring command ratio
webuse fuel, clear
list
ratio mpg1 / mpg2 
ratio myratio: mpg1/mpg2 /*naming issue*/
test _b[myratio] = 1
*exploring command proportion
use http://www.ats.ucla.edu/stat/stata/notes/hsb2, clear
proportion ses

*exploring command total

total write
total write, over(ses)
gen hiwrite = write > 60
total hiwrite
total hiwrite, over(female)
*exploring slogit, mprobit and asmprobit

slogit ses female write
slogit ses female write, dim(2) 
mlogit ses female write, basecat(3) /*same as slogit above*/
mprobit ses female write
* asmprobit (Maximum simulated-likelihood alternative-specific multinomial probit models)
webuse travel
clist in 1/10
asmprobit choice traveltime termtime, casevars(income) case(id) alternatives(mode)
*exploring multiple graphics windows
use http://www.ats.ucla.edu/stat/stata/notes/hsb2, clear
graph twoway scatter write math
graph twoway scatter write math, name(g1)
histogram write, name(g2)
*new feature of merge
use http://www.ats.ucla.edu/stat/stata/notes/hsb2, clear
foreach var of varlist write math read science socst {
     preserve
     keep id `var'
     sort id
     save `var', replace
     restore
}
use read, clear
drop if _n<=10
save, replace
use write
merge id using math read science socst
tablist _merge*
clear
use read, clear /*nonsymmetric bahavior of _merge*/
merge id using write math science socst
tablist _merge*
*xml stuff, IT IS COOL!!!!
use http://www.ats.ucla.edu/stat/stata/notes/hsb2, clear
xmlsave hsb2, doc(excel) replace
/*hsb2.xml can be opened by excel directly*/
/*file saved as .xml file in Excel can be read into Stata directly 
  using xmluse*/
xmluse hsb2, doc(excel) first 
xmlsave hsb2_dta, doc(dta) dtd
*other other stuff
viewsource qreg.ado
copysource qreg.ado

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