how to convert factor levels to integer in r

Question

I have following dataframe in R

  ID      Season      Year       Weekday
  1       Winter      2017       Monday
  2       Winter      2018       Tuesday
  3             


        

Answer 1

Once you have converted the season, year and weekday to factors, use this code to change to dummy indicator variables

contrasts(factor(dat$season) 
contrasts(factor(dat$year)
contrasts(factor(dat$weekday)