[datatable-help] := and ':=" throwing errors

[carlsutton]

My goal is to create proportions for several variables, by group, and save
these in new columns.   So far I have spent most of the day researching
this, retaking the Data Camp data table course, and all iterations have
failed miserably.   Several google searches were not helpful.  Console out
put (code and error messages below.  Hopefully.
Proportions.R <http://r.789695.n4.nabble.com/file/n4718825/Proportions.R>  
<http://r.789695.n4.nabble.com/file/n4718825/Capture.png> 

Carl Sutton



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Carl Sutton
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