Hi,
I have a dataset with many observations some days while only one others. I
would like to calculate a mean value per day and then do regression analysis
on the means.
This is what I have:
YearDayTimeherring.density
200747 10.36 2.2
200747 11.50
Hi,
Look at ?aggregate.
df - read.table(textConnection(Year Day Time herring.density
2007 47 10.36 2.2
2007 47 11.50 1.1
2007 47 14.24 1.4
2007 66 9.35 2.5), header=TRUE)
You could do this:
aggregate(herring.density~Year+Day, data=df, FUN=mean)
And for the second question:
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