Regression analysis in R: backward selection

Selecting variables for a linear model is dicey. Let's get started! If this vid helps you, please help me a tiny bit by mashing that 'like' button. For more #rstats joy, crush that 'subscribe' button!

[@EquitableEquations]

You can find materials supporting this vid (and others) at github.com/equitable-equations/youtube.

[@louiseweschler1746]

Got it! Thank you very much. Now I can work through another great vid in your Regression series of vids (*all* your vids are excellent!).

[@Ammarsays]

Great video. Please also make a video on selection in logistic regression. And also how we can automate the removal of variables based on a criteria.

[@umagenetics3975]

plz make video abour forward stepwise

[@brazilfootball]

I heard you mention this wouldn't be devoted to inference, but wondered if you could help me understand the pitfalls of stepwise elimination as its summarized in this sentence I found: "If you remove the insignificant terms and then refit, the inference results (p-values) would not include the "effect" of the previous selection". I can't wrap my head around what this means practically and what the implications might be. Any corrections or thoughts? Thank you, I really enjoy your videos!

[@EquitableEquations]

Hi! Yes, that's a reasonable way of describing it. As a result of the process used to get them, the p-values of the remaining terms will be low after variable selection. You shouldn't use their lowness to draw conclusions about statistical significance.

[@brazilfootball]

Oh, ok! I don’t know why that was so hard for me to get. Thanks again! 😅

[@louiseweschler1746]

Please give a link to the data set (performance.csv).

[@EquitableEquations]

Added to github. Thanks!

Really interesting topic. Great video, really well explained!

[@DrGKumar-me7bx]

My humble request you to make videos regarding ggplot2 with tools geom_ point, geom_bar, geom_line, pie chart, geom_area and others geom relates charts with one single dataset with every charts all the syntax. It will be useful as a beginner. Thank you so much for your great effort. ❤❤❤❤

[@EquitableEquations]

Hi! I've got vids on most of those geoms, including point (kzbin.info/www/bejne/Y5yYoamurt6cbtE) and bar (kzbin.info/www/bejne/fqeygnmHr66aa8U). You might also be interested in my ggplot overview (kzbin.info/www/bejne/g5SvaoCDrNJ8kLs), which covers a lot of geoms using only a few data sets.

[@evanspencer3819]

Thanks for the great video. Really well done.

[@EquitableEquations]

Thanks man!

[@DrGKumar-me7bx]

Thank you sir.

[@7ooda2620]

Thank you for the very helpful video, and I have a question: Why do we need linear regression when there are machine learning methods?

[@EquitableEquations]

Regression *is* a machine learning method, in fact the most important one. Anyhow my goal here is understanding, not just black-box prediction.