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[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) **[Unsubscribe from this filter](http://stackexchange.com/email/unsubscribe-filter/46499/1553612417?code=sLu%2bnabss4JOGgiRpohiMXEmFU6A%2b%2fNOUsaLvwh9lzo%3d) or change your email preferences by visiting your [filter subscriptions page on stackexchange.com](http://stackexchange.com/users/44512d26-f3c9-4c8d-9f4b-9e5035a76ba1?tab=subscriptions).** _________________________________________________________________________ Questions? Comments? Let us know on our [feedback site][9]. If you no longer want to receive mail from Stack Exchange, [unsubscribe from all stackexchange.com emails][7]. Stack Exchange, Inc. One Exchange Plaza, 26th Floor, NY NY 10006 <3 [7]: http://stackexchange.com/email/manage/32179/50c7b797e95587cf7a3fe93ea9f9f3c7c01ca47b809ac13d6452ad1f766b38c4 [8]: http://stackexchange.com [9]: http://meta.stackoverflow.com
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