clear
set more off
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* type "help log" in the command window to see help on command log
* log using mystatasession.txt, replace
*
* the previous line can be used to save a log in an interactive session
******
drawnorm x y, n(100)
describe 
summarize
list x
scatter y x
gen dep=2*x+y^2
scatter dep x
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* not the kind of heteroskedasticity i want
* generate another variable
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* gen dep=2*x+y*exp(x) * this generate an error!
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* first must drop, then can replace
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drop dep
gen dep=2*x+y*exp(x)
scatter dep x
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* clear heteroskedasticity!
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regress dep x
twoway (lfitci dep x) (scatter dep x)
hettest 
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* heteroskedasticity test: strongly reject H0
* type "help hettest" in the command window to see help on command hettest
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rvfplot
* log close