Please Help! Don't know which model to use


I'm not sure which model to use, I'm guessing it is some type of regression. If you could help, I'd greatly appreciate it!

The problem statement is: When a customer buys X, what's the likelihood they will buy Y?

Here's the kicker- We have hundreds of products for sale therefore there are a lot of potential independent & dependent variables.

What type of analysis would you recommend using?



Dark Knight
You could try many model here.
First you can create summary data like this
\( \begin{tabular}{c|cc}
& buys Y& Not buys Y \\ \hline
buys X & & \\
Not buys X & &

Or you could build a Logistic regression on the sales data where the customer buys X(Sale of Y will be your response)
I would like to know what are the differences between enter and stepwise method? which one is better? can you recommend me some links to check it, please?