Re: [R] Finding Highest value in groups
Thanks a lot. Its really helpful Regards Saba On Saturday, 23 April 2016, 6:50, Giorgio Garziano wrote: Since the aggregate S3 method for class formula already has got na.action = na.omit, ## S3 method for class 'formula' aggregate(formula, data, FUN, ..., subset, na.action = na.omit) I think that to deal with NA's, it is enough: aggregate(Value~ID, dta, max) Moreover, passing na.rm = FALSE/TRUE is "don't care": aggregate(Value~ID, dta, max, na.rm=FALSE) result is: ID Value 1 1 0.69 2 2 0.99 3 3 1.00 4 4 1.00 5 5 0.50 which is the same of na.rm=TRUE. On the contrary, in the following cases: aggregate(Value~ID, dta, max, na.action = na.pass) ID Value 1 1 0.69 2 2 0.99 3 3 1.00 4 4NA 5 5 0.50 aggregate(Value~ID, dta, max, na.action = na.fail) Error in na.fail.default(list(Value = c(0.69, 0.31, 0.01, 0.99, 1, NA the result is different. -- Best, GG [[alternative HTML version deleted]] __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Finding Highest value in groups
Since the aggregate S3 method for class formula already has got na.action = na.omit, ## S3 method for class 'formula' aggregate(formula, data, FUN, ..., subset, na.action = na.omit) I think that to deal with NA's, it is enough: aggregate(Value~ID, dta, max) Moreover, passing na.rm = FALSE/TRUE is "don't care": aggregate(Value~ID, dta, max, na.rm=FALSE) result is: ID Value 1 1 0.69 2 2 0.99 3 3 1.00 4 4 1.00 5 5 0.50 which is the same of na.rm=TRUE. On the contrary, in the following cases: aggregate(Value~ID, dta, max, na.action = na.pass) ID Value 1 1 0.69 2 2 0.99 3 3 1.00 4 4NA 5 5 0.50 aggregate(Value~ID, dta, max, na.action = na.fail) Error in na.fail.default(list(Value = c(0.69, 0.31, 0.01, 0.99, 1, NA the result is different. -- Best, GG [[alternative HTML version deleted]] __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Finding Highest value in groups
Base R functions can handle this easily. It is preferable to use dput() as a
compact way of providing data on the list:
> dta <- read.table(text="IDValue
+ 10.69
+ 10.31
+ 20.01
+ 20.99
+ 31.00
+ 4NA
+ 40
+ 41
+ 50.5
+ 50.5
+ ", header=TRUE)
> dput(dta)
structure(list(ID = c(1L, 1L, 2L, 2L, 3L, 4L, 4L, 4L, 5L, 5L),
Value = c(0.69, 0.31, 0.01, 0.99, 1, NA, 0, 1, 0.5, 0.5)), .Names = c("ID",
"Value"), class = "data.frame", row.names = c(NA, -10L))
Then you just need the aggregate() function:
> aggregate(Value~ID, dta, max, na.rm=TRUE)
ID Value
1 1 0.69
2 2 0.99
3 3 1.00
4 4 1.00
5 5 0.50
See ?aggregate for the help page.
-
David L Carlson
Department of Anthropology
Texas A&M University
College Station, TX 77840-4352
-Original Message-
From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Tom Wright
Sent: Friday, April 22, 2016 9:13 AM
To: Saba Sehrish
Cc: R-help Mailing List
Subject: Re: [R] Finding Highest value in groups
Assuming your dataframe is in a variable x:
> require(dplyr)
> x %>% group_by(ID) %>% summarise(maxVal = max(Value,na.rm=TRUE))
On Fri, 2016-04-22 at 13:51 +, Saba Sehrish via R-help wrote:
> Hi
>
>
> I have two columns in data frame. First column is based on "ID" assigned to
> each group of my data (similar ID depicts one group). From second column, I
> want to identify highest value among each group and want to assign the same
> ID to that highest value.
>
> Right now the data looks like:
>
> IDValue
> 10.69
> 10.31
> 20.01
> 20.99
> 31.00
> 4NA
> 40
> 41
> 50.5
> 50.5
>
> I want to use R program to get results as below:
>
> ID Value
> 10.69
> 20.99
> 31.00
> 41
> 50.5
>
> Kindly guide me in this regard.
>
> Thanks
> Saba
>
> __
> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
__
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
__
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] Finding Highest value in groups
idvalues <- data.frame (ID = c(1, 1, 2, 2, 3, 4, 4, 4, 5, 5), Value = c(0.69, 0.31, 0.01, 0.99, 1.00, NA, 0,1, 0.5, 0.5)) aggregate(Value~ID, data=idvalues, max) ID Value 1 1 0.69 2 2 0.99 3 3 1.00 4 4 1.00 5 5 0.50 -- Best, GG [[alternative HTML version deleted]] __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Finding Highest value in groups
Assuming your dataframe is in a variable x: > require(dplyr) > x %>% group_by(ID) %>% summarise(maxVal = max(Value,na.rm=TRUE)) On Fri, 2016-04-22 at 13:51 +, Saba Sehrish via R-help wrote: > Hi > > > I have two columns in data frame. First column is based on "ID" assigned to > each group of my data (similar ID depicts one group). From second column, I > want to identify highest value among each group and want to assign the same > ID to that highest value. > > Right now the data looks like: > > IDValue > 10.69 > 10.31 > 20.01 > 20.99 > 31.00 > 4NA > 40 > 41 > 50.5 > 50.5 > > I want to use R program to get results as below: > > ID Value > 10.69 > 20.99 > 31.00 > 41 > 50.5 > > Kindly guide me in this regard. > > Thanks > Saba > > __ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
