Thank you. That did it. I would still like to read more. What does one call this? What are the correct buzzwords to search for. Do you know of any blog posts / articles?
On Fri, Oct 20, 2017 at 2:28 PM Cook, Malcolm <[email protected]> wrote: > > > Result.dt<-dt[ , list(sd.dtable=dtable(.SD)), by=trichotomous.variable] # > untested > > > > will return a Result.dt with 2 columns: trichotomous.variable and sd.dtable > > > > The value of Result.dt[1,sd.dtable][[1]] will give the 1st groups dtable > results > > > > [email protected] > > > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Farrel > Buchinsky > *Sent:* Friday, October 20, 2017 1:14 PM > *To:* [email protected] > *Subject:* [datatable-help] Generating data.tables from a j function > > > > I am relatively certain that data.table can handle a function in the J > position that generates a data.frame or a data.table. However, how does one > handle the output? Can you please point me to a url that discusses the > capability? > > > > For instance, I sometimes use the package dtables to generate descriptive > statistics. It generates a table for > > > > So one could go > > > > library(dtables) > > dtable(dt) > > > > But what if one wanted to get descriptive statistics by a trichotomous > variable > > > > dt[ , dtable(.SD), by=trichotomous.variable] > > > > *I am looking for a general article or blogpost about how to handle > outputs that are not single numbers or two numbers. *There are functions > that yield data.tables or lists or specialized objects such a models. Any > suggestions? > > > > I know one can simply print the output to the console > > > > dt[ , print(dtable(.SD)_, by=trichotomous.variable] > > > > But that does not let me do anything intelligent afterwards. > > -- > > Farrel Buchinsky > > (412) 567-7870 (gets me everywhere) > -- Farrel Buchinsky (412) 567-7870 (gets me everywhere)
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