Hi, everyone,
Would anyone help me with the problem below?
I have a dataset x including ID, Time, DV and ID2.
I can use
x$DV[x$Time==0]_0
to make DV=0 when Time is 0 but when I was trying to use command “x$ID2[x$Time==0]_"zero"”
to make ID2==zero when Time is 0, I received the following message”
Warning
messages:
replacement values not all in levels(x): NA's generated in: .A0[x$Time ==
0] <- "zero"
Why
is that? How can I do what I want to do? What would be effective command to
change DV=0 when time is 0,2 and 4. Thanks in advance.
Jenny
x_data.frame(ID=seq(1,10,1),Time=rep(c(0,1,2,3,4),2),DV=rnorm(10,0,1),ID2=rep(sample(letters,5),2))
x$DV[x$Time==0]_0
x$ID2[x$Time==0]_"zero"
Warning
messages:
replacement values not all in levels(x): NA's generated in: .A0[x$Time ==
0] <- "zero"