Hi all,
Assume that I have a data set (xcv) with several variables and some of
the variables have a missing observation represented by -9 as shown below.
I want to exclude these observations from the analysis ( as a NA). Is
there a command that I can do it for the entire data set rather than one by
one for each variable ( tmp <- xcv[xcv$v1 != -9, ])
V1 v2 v3 v4
11 23 14 -9
12 -9 21 3
-9 30 41 25
15 07 -9 10
and I want the results as follows
V1 v2 v3 v4
11 23 14 NA
12 NA 21 3
NA 30 41 25
15 07 NA 10
The second question is I want to calculate the number of days between two
dates
Start end number of days
20020626 20020805 40
20030101 20030421 110
How do I do it in R?
Thanks in advance
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