[R] get top n rows group by a column from a dataframe

2010-09-16 Thread Tan, Richard
Hi, is there an R function like sql's TOP key word? I have a dataframe that has 3 columns: company, person, salary How do I get top 5 highest paid person for each company, and if I have fewer than 5 people for a company, just return all of them? Thanks, Richard

Re: [R] get top n rows group by a column from a dataframe

2010-09-16 Thread RICHARD M. HEIBERGER
tmp - data.frame(matrix(rnorm(30), 10, 3, dimnames=list(letters[1:10], c(company, person, salary tmp company person salary a -1.04590176 -0.7841855 1.07150503 b -1.06643101 0.6545647 0.43920454 c

Re: [R] get top n rows group by a column from a dataframe

2010-09-16 Thread Tan, Richard
-project.org Subject: Re: [R] get top n rows group by a column from a dataframe tmp - data.frame(matrix(rnorm(30), 10, 3, dimnames=list(letters[1:10], c(company, person, salary tmp company person salary

Re: [R] get top n rows group by a column from a dataframe

2010-09-16 Thread Phil Spector
] Sent: Thursday, September 16, 2010 11:53 AM To: Tan, Richard Cc: r-help@r-project.org Subject: Re: [R] get top n rows group by a column from a dataframe tmp - data.frame(matrix(rnorm(30), 10, 3, dimnames=list(letters[1:10], c

Re: [R] get top n rows group by a column from a dataframe

2010-09-16 Thread Henrique Dallazuanna
list. I don't see how your way can work? Thanks, Richard From: RICHARD M. HEIBERGER [mailto:r...@temple.edu] Sent: Thursday, September 16, 2010 11:53 AM To: Tan, Richard Cc: r-help@r-project.org Subject: Re: [R] get top n rows group by a column from a dataframe tmp - data.frame

Re: [R] get top n rows group by a column from a dataframe

2010-09-16 Thread Tan, Richard
Thanks, it works. Richard From: Henrique Dallazuanna [mailto:www...@gmail.com] Sent: Thursday, September 16, 2010 1:56 PM To: Tan, Richard Cc: RICHARD M. HEIBERGER; r-help@r-project.org Subject: Re: [R] get top n rows group by a column from a dataframe You can try this: (Using

Re: [R] get top n rows group by a column from a dataframe

2010-09-16 Thread William Dunlap
-Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Tan, Richard Sent: Thursday, September 16, 2010 8:39 AM To: r-help@r-project.org Subject: [R] get top n rows group by a column from a dataframe Hi, is there an R function like

Re: [R] get top n rows group by a column from a dataframe

2010-09-16 Thread Dennis Murphy
Hi: You already have some good solutions; here is another using the plyr package, based on a slight modification in salary from Phil Spector's test data: sdata = data.frame(company=sample(LETTERS[1:8],1000,replace=TRUE), person=1:1000, salary=