search for: by2

...ello all, I would appreciate your thoughts on a seemingly simple problem. I have a database, where each row represent a single record. I want to aggregate this database so I use the aggregate command : D<-read.csv("C:\\Users\\test.csv") attach(D) by1<-factor(Class) by2<-factor(X) W<-aggregate(x=Count,by=list(by1,by2),FUN="sum") The results I get following the form: >W Group.1 Group.2 x 1 1 0.1 4 2 2 0.1 7 3 3 0.1 1 4 1 0.2 3 5 3 0.2 4 6 3 0.3 4 However, what I...

...king/merging two dataframes in R? I want to stack them piece-wise, not simply add one whole dataframe to the bottom of the other. I want to create as follows: x.frame: aX1 bX1 cX1 ... zX1 aX2 bX2 cX2 ... zX2 ... ... ... ... ... aX99 bX99 cX99 ... zX99 y.frame: aY1 bY1 cY1 ... zY1 aY2 bY2 cY2 ... zY2 ... ... ... ... ... aY99 bY99 cY99 ... zY99 new.frame: aX1 bX1 cX1 ... zX1 aY1 bY1 cY1 ... zY1 aX2 bX2 cX2 ... zX2 aY2 bY2 cY2 ... tY2 ... ... ... ... ... aX99 bX99 cX99 ... tX99 aY99 bY99 cY99 ... tY99 I have tried to use a for loop (simply assigning and also with...

...code suggests that the hist.constructor function (which does not seem to be easily accessible). Any suggestion for computing the density values of foo$x in the following example will be welcome. require(lattice) set.seed(12345) foo1 <- data.frame(x=rnorm(100,0,0.1),grp=1,by=rep(1:2,each=50),by2=rep(1:2,times=50)) foo2 <- data.frame(x=rnorm(100,2,1),grp=2,by=rep(1:2,each=50),by2=rep(1:2,times=50)) foo <- rbind(foo1,foo2) xplot <- histogram(~x,data=foo, type='density') PS: the present question relates to a workaround for another problem previously submitted to the list (...

Hola compañeros, estaba utilizando la función "aggregate" y quería que tuviese en cuenta los NAs. He leido la documentación de dicha función y aparece esto: # and if you want to treat NAs as a group fby1 <- factor(by1, exclude = "") fby2 <- factor(by2, exclude = "") aggregate(x = testDF, by = list(fby1, fby2), FUN = "mean") (http://stat.ethz.ch/R-manual/R-patched/library/stats/html/aggregate.html) Pero el argumento exclude de la función factor, para que tenga en cuenta NAs (según la documentación de factor,...

...nd space only works for months and years. The solution (or my solution at any rate) is to change if (valid <= 5) by <- c(1, 60, 3600, 86400, 7 * 86400)[valid] to if (valid <= 5) { by <- c(1, 60, 3600, 86400, 7 * 86400)[valid] if (length(by2) == 2) by <- by * as.integer(by2[1]) } in the seq.POSIXt code. Thanks to those who worked to add the DateTimeClasses. I have only started making use of these recently, but am finding them very useful. David Middleton Dr David A. J. Middleton, Stock Assessment Scientist Fisheries Department...

Hi all, A suggestion derived from discussions amongst a number of R users in my research group: set the default column names produced by aggregate () equal to the names of the objects in the list passed to the 'by' object. ex. it is annoying to type with( my.data ,aggregate( my.dv ,list( one.iv = one.iv ,another.iv = another.iv ,yet.another.iv = yet.another.iv )

...returns invisibly (which makes sense as one doesn¹t assign panel.abline to a variable) so my guess is the answer is no. The only thing I could find in the archives had the calculations done manually within panel.groups ( http://www.nabble.com/add-trend-line-to-each-group-of-data-in%3A-xyplot(y1%2 By2-~-x-|-grp...-td3344023.html#a3382909) but that was a few versions back. Other suggestions? Thanks, Bryan ************* Bryan Hanson Professor of Chemistry & Biochemistry DePauw University, Greencastle IN USA [[alternative HTML version deleted]]