G. Grothendieck questions

G. Grothendieck answers

• regsubsets is generating dummy variables from factor levels - can we make it not do that?
• Convert numeric date format (YYYYMMDD; 20150101) into Year-Month
• How to detect a gap in series data using R
• dplyr group by external variable [closed]
• Calculating a rolling 14 day average when dates are missing
• r subset dataset by date range over multiple years
• R sqldf - match.fun(asfn) 'c("as.labelled", "as.integer")' is not a function, character or symbol
• Is there an R equivalent of Python's '*'?
• Adding overall mean when using group_by
• Convert dplyr pipeline into SQL string