Fit a Cox proportional hazards model and check proportional-hazards assumption with Stata®

Learn how to fit a Cox proportional hazards model in Stata using the stcox command. We also demonstrate how to check the proportional-hazards assumption statistically using estat phtest and graphically using stphplot and *stcoxkm*.
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[@deraragirma1522]

very helpful, STATA is really a friendly software.

[@Tbone913]

Useful and clear thank you

[@zewditudenu7939]

Very helpful and clear video thanks!

[@plasticcarnage]

Very helpful

[@fernandosilvarivas7138]

thanks chuck I expect you to upload some material on Hosmer-Lemeshov GOF after logistic regression and ROC analysys you´re great, thanks again

[@angelinakancheva3990]

So is the idea here that we don't want the two lines to be crossing each other? What about if they exhibit a non-random pattern against the variable time? Some more detail regarding the interpretation would be very very much appreciated! :)

[@phutingwepe]

Very great video man. Thanks alot

[@charlottemc4201]

Great video, how to you add the interaction between age and drug to the fit model?

[@xiaochenqu5219]

Thank you very much for the very informative video! Sorry it the question is stupid: at 2:56 you added another variable of age. But why the result for drug have changed afterwards? Before adding age, the haz.ratio was 0.133, and 95% conf. interval was (0.045, 0.314), and after they became 0.105 and (0.043, 0.256)?

[@manthizen]

Hi xiao did you find the answer for this? Im here cuz I got this question while doing an analysis.

[@farajakillahb3065]

Good❤

[@vanc_n_zosyn1651]

I saw someone using an i. before the initial independent variable, what does this exactly means? Thank you!

[@balaramkrishnahanumanthu5869]

mateo is that you?

[@vanc_n_zosyn1651]

@@balaramkrishnahanumanthu5869 jajajjajajja yes...before I discovered the beauty of the the factor variable commands

[@marcushollington297]

For categorical variables

[@diahpradnyadewi1961]

very helful! please add some subs