I am trying to find the mean for the elements in the vector
Incubation=as.POSIXlt(OnsetTime)-as.POSIXlt(MealTime)
where
OnsetTime=c(NA,"1940-04-19 00:30","1940-04-19 00:30","1940-04-19
00:30",NA,"1940-04-18 22:30","1940-04-18 22:30","1940-04-19
02:00","1940-04-19 01:00","1940-04-18 23:00",N
Thanks for all the help. I'll do some more reading.
Brian
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> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of
> [EMAIL PROTECTED]
> Sent: Thursday, August 21, 2008 12:15 PM
> To: r-help@r-project.org
> Subject: [R] mean for vector with NA
>
> I am trying to find the mean for
Hi,
[EMAIL PROTECTED] wrote:
I have tried
mean(Incubation)
and
mean(as.numeric(Incubation))
what about
mean(Incubation, na.rm=TRUE)
?
I get the following result:
> mean(Incubation, na.rm=TRUE)
Time difference of 4.295455 hours
>
but I think that, since there are so many NA values in Incu
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