Wide to long format part 2 - Pivoting with multivariate data

Описание к видео Wide to long format part 2 - Pivoting with multivariate data

depression_wide dataset: quantpsych.net/data/depression_wide.csv
gaming dataset: quantpsych.net/data/gaming.csv
link to R document: quantpsych.net/data/11b-pivoting.R

Objectives
1. what complications non time-varying complications add
2. know what time varying variables are
3. Know how to use starts_with, ends_with, etc for pivoting
4. Know how to use gsub
5. Two ways to merge datasets

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