[R] Can't compute row means of two columns of a dataframe.
Ebert,Timothy Aaron
tebert @end|ng |rom u||@edu
Sat Jun 8 22:05:48 CEST 2024
Can this problem be made more direct?
xxxz$Average.20 <- (xxxz$Low20 + xxxz$High20)/2
That is literally the mean of two columns. Functions can be useful if there will be more columns, but with just two this seems easier.
I will point out that the average daily temperature based on the midpoint between minimum and maximum contains a fair bit of error because that is only roughly how heating and cooling respond. I admit that sometimes there are no other choices and we work with available data.
Tim
-----Original Message-----
From: R-help <r-help-bounces using r-project.org> On Behalf Of Sorkin, John
Sent: Saturday, June 8, 2024 1:38 PM
To: r-help using r-project.org (r-help using r-project.org) <r-help using r-project.org>
Subject: [R] Can't compute row means of two columns of a dataframe.
[External Email]
I have a data frame with three columns, TotalInches, Low20, High20. For each row of the dataset, I am trying to compute the mean of Low20 and High20.
xxxz <- structure(list(TotalInches =
c(58, 59, 60, 61, 62, 63, 64, 65,
66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76), Low20 = c(84, 87,
90, 93, 96, 99, 102, 106, 109, 112, 116, 119, 122, 126, 129,
133, 137, 141, 144), High20 = c(111, 115, 119, 123, 127, 131,
135, 140, 144, 148, 153, 157, 162, 167, 171, 176, 181, 186, 191
)), class = "data.frame", row.names = c(NA, -19L)) xxxz
str(xxxz)
xxxz$Average20 <- by(xxxz[,c("Low20","High20")],xxxz[,"TotalInches"],mean)
warnings()
When I run the code above, I don't get the means by row. I get the following warning messages, one for each row of the dataframe.
Warning messages:
1: In mean.default(data[x, , drop = FALSE], ...) :
argument is not numeric or logical: returning NA
2: In mean.default(data[x, , drop = FALSE], ...) :
argument is not numeric or logical: returning NA
Can someone tell my what I am doing wrong, and how I can compute the row means?
Thank you,
John
John David Sorkin M.D., Ph.D.
Professor of Medicine, University of Maryland School of Medicine; Associate Director for Biostatistics and Informatics, Baltimore VA Medical Center Geriatrics Research, Education, and Clinical Center; PI Biostatistics and Informatics Core, University of Maryland School of Medicine Claude D. Pepper Older Americans Independence Center; Senior Statistician University of Maryland Center for Vascular Research;
Division of Gerontology and Paliative Care,
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
Cell phone 443-418-5382
______________________________________________
R-help using 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.
More information about the R-help
mailing list