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Mar 22, 2018 at 16:05 comment added AdamO This should probably be closed as off-topic, this comes up a lot on the site. Coding of dummy variables uses $k-1$ factors for $k$ levels.
Mar 22, 2018 at 15:55 answer added Isabella Ghement timeline score: 2
Mar 22, 2018 at 8:16 history asked Jos Antonio Sanabria Fernndez CC BY-SA 3.0