Programming the statistical procedures from SAS

How to correct for sample selection bias in proc mdc?

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How to correct for sample selection bias in proc mdc?

Greeting to SAS communities,

My question is how to correct for sample selection bias in discrete choice modeling done by proc mdc? My research has two steps: Step 1) Predict whether a household chooses to purchase an internet connection in their home or not (yes vs no: binary logit), Regressors for step 1 includes household characteristic such as age, education, income, etc. Step 2) If a household chooses to purchase an internet connection, predict a choice of an internet package available in a household's area. (say five choices: conditional logit model). Regressors for step 2 includes household characteristics and choice characteristics such as monthly price, download speed and upload speed.

I am currently using doing only step 2 by proc mdc. However, my professor comments that my estimation may be biased. He suggests adding step 1 into estimation. Although proc qlim has a selection bias correction option, it cannot fit proc mdc-like dataset (dataset that have number of rows equal to number of choices for an individual). Could you pls suggest me an idea? Thank so much for every help.

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