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There are many new features of Stata 9, among them we will mention a few here:
Multiple do-file editors;
Multiple Viewer windows;
support links
support text search
Multiple graphics windows using the name() option
Multiple lines of code can be copied into command window
Merge can handle multiple data files in one step
Viewsource and copysource command
*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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