[R] Questions about doing analysis based on time

[Rui Barradas]

Hello,

The only explanation I'm seeing is you are computing the SunScore 
averages using different datasets. With the dataset oyu've dput-ed I get 
your hand results.

aggregate(SunScore ~ h, data=dat, mean)
   h SunScore
1 0 131.0167
2 1 107.7436

# Another way of doing the same
sapply(split(dat$SunScore, h), mean, na.rm=TRUE)
        0        1
131.0167 107.7436

Also, please quote the message you're answering to, it's better to have 
context.

Rui Barradas

Em 28-06-2012 14:16, APOCooter escreveu:
> That is very helpful, and exactly what I was looking for!
>
> However, I seem to have some problems.  When I ran the following line:
>
> aggregate(SunScore ~ h, data=dat, mean)
>
> I got the following output:
>
>      h  SunScore
> 1   0 136.01389
> 2   1 135.27632
> 3   2 127.03704
> 4   3 127.17105
> 5   4 129.94545
> 6   5 113.70909
> 7   6 111.49020
> 8   7 109.51020
> 9   8  98.03922
> 10  9  88.40000
> 11 10  72.57407
> 12 11  63.41333
> 13 12  68.36170
> 14 13  68.28571
> 15 14  77.47761
> 16 15  93.18056
> 17 16 108.78161
> 18 17 112.39759
> 19 18 126.17241
> 20 19 126.98901
> 21 20 134.03896
> 22 21 131.48611
> 23 22 135.06024
> 24 23 136.02247
>
> But when I do the averages by hand, I get different numbers.  When I
> calculated the average of the scores from 0:00 to 0:59, I got a score of
> 131.01667.  However, R says the average for the same time period is
> 136.01389.  Why are these numbers so different? And how can I fix it?
>
> --
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