[datatable-help] New data.table questions for Sep 9 - Stack Exchange

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1 new question in [data.table filter](http://stackexchange.com/filters/7853/data-table) on stackexchange.com

[Tabulations and insertions with data\.table](http://stackoverflow.com/questions/7367965/tabulations-and-insertions-with-data-table)
I am trying to take a very large set of records with multiple indices, calculate an aggregate statistic on groups determined by a subset of the indices, and then insert that into every row in the ...
Tagged:  r  data.table   by [Iterator](http://stackoverflow.com/users/805808/iterator) on [stackoverflow.com](http://stackoverflow.com)




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