Index from Principal component analysis and then a tobit model

[Olive Bat]

I run a tobit..with the index (gained from using principal component analysis) . This index is my dependent variable and also specify the ul( the highest values in the index).here are my command
tobit sav_index for_remitt_hh DRatio i.sex_hh i.age_group_hh i.edu_hh i.eco_activity_hh i.married_hh i.hhsize i.religion_hh i.District_Code i.land_acresnew i.type_of_house_hh i.type_of_fuel i.bank_acc_hh, ul(of the index)
i want to know we run the margins with three different command as mentioned below .. which one to report. is my question
margins,dydx(*)atmeans predict (e(0,.))
margins,dydx(*)atmeans predict(ystar(0,.))
margins, dydx(*) predict(p(0,.))

[Nick Cox]

I am trying to create an index using principal component analysis as i lot of variable for investment. ….

do i need to standard these variables is my question?

You already asked this and got some reactions at https://www.statalist.org/forums/for...onent-analysis

Good practice in a technical forum includes

* cross-posting previous threads that remain pertinent to a new thread you start

* revising (e.g. expanding) your question if a previous version didn't resolve your uncertainty

* explaining why previous answers aren't satisfactory from your point of view.

I have to say that if you're still asking this, then you need to study multivariate statistics textbooks to get a better understanding of PCA -- this is one of the first questions about how to apply it precisely -- and/or to seek help locally from your supervisor, advisor, or course teachers.

[Olive Bat]

Okay i just checked your reply sorry for reposting ..but still query remains on tobit.. any reading or any help on that..