R - Dummy Coding in Regression

[@pereexcel2475]

Hi and I am so happy to have found this channel and your website. Please I am a beginner in machine learning and would want to know in a situation where the levels are more than 10 and there are more than 3 columns with such kind of levels. Any information will be relevant trust me...:)

[@StatisticsofDOOM]

If you have 10 levels, you would need to include 9 columns to code all the levels. If you have three of those types of variables, you'd have to repeat the process three times (so you would end up with 27 columns).