search for: trend2

I have two vectors: both have possible values of 1,-1, or 0 trend1 <- c(1,1,1,1,1,1,-1,-1,-1,-1,-1,-1) trend2 <- c(1,1,1,1,1,1,1,1,1,1,1,1,1,1,) i want to create a third vector that is conditional upon these two vectors: if (trend2 == 1 && trend1 == 1) {position <- 1} elseif (trend2 == -1 && trend1== -1) {position <- 1} else {position <- 0} based on this two conditions, the p...

...tml .... RESPONSE: Since I'm in the process of switching from SAS to R, this was a good exercise for me. An R program to work the example you cited is appended. I hope this meets your needs. Chuck White # R program for working example at: # http://www.gseis.ucla.edu/courses/ed230bc1/cnotes4/trend2.html # # Copy and paste the example data from the web to a plain text editor # and save as 'example.txt'. Read the data as follows: example<-read.table("example.txt", header = FALSE, col.names=c('y','grp','o1','o2','o3')) example # Mak...

...results in output tables is so much easier in R than what I've had to do in SAS that it's incredible. An R program to work the example you cited is appended. I hope this meets your needs. Chuck White # R program for working example at: # http://www.gseis.ucla.edu/courses/ed230bc1/cnotes4/trend2.html # # Copy and paste the example data from the web to a plain text editor # and save as 'example.txt'. If this program is copied and passted into # the R Console then the program is expected to run without further # operator intervention. #Read the data as follows: example<-read.tab...