Preserve zero-length groups

[hadley]

http://stackoverflow.com/questions/22523131

Not sure what the interface to this should be - probably should default to drop = FALSE.

[eipi10]

Thanks for opening up this issue Hadley.

[statwonk]

👍 ran into the same issue today, drop = FALSE would be a big help for me!

[wsurles]

Any idea on the time frame for putting a .drop = FALSE equivalent into dplyr? I need this for certain rCharts to render correctly.

In the mean time I DID get the answer in your link to work.
http://stackoverflow.com/questions/22523131

I grouped by two variables.

[jennybc]

+1 for option to not drop empty groups

[hadley]

May be some overlap with #486 and #413.

[slackline]

Not dropping empty groups would be very useful. Often needed when creating summary tables.

[mcfrank]

+1 - this is a deal-breaker for many analyses

[bpbond]

I agree with all the above--would be very useful.