How to calculate mean?

Question

I would like to calculate the temperature mean for each country. I have a data.frame of 10 countries and their respective temperatues. As you see:

    Country amp_temperature
1   France  17,6
2   France  17,2
3   Italy   17,4
4   Slovenia    18,6
5   Slovenia    18,3
6   Estonia 23,8
7   Estonia 22,7
8   Estonia 21,5
9   Estonia 23,1
10  Estonia 23,7
11  Estonia 23,8
12  Estonia 22,9
13  Estonia 23,6
14  Norway  21,4

Thank you very much for your help!

not sure what the question here.. algorithm, actual code? what have you tried? — Karoly Horvath, Oct 03 '13 at 15:15

score 2 · Accepted Answer · edited May 23 '17 at 11:58

2

Suppose your data is DF, aggregate function should be one good alternative.

> aggregate(amp_temperature~Country, FUN=mean, data=DF)
   Country amp_temperature
1  Estonia         23.1375
2   France         17.4000
3    Italy         17.4000
4   Norway         21.4000
5 Slovenia         18.4500

You can check this answer which gives several anternatives to do what you need.

edited May 23 '17 at 11:58

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answered Oct 03 '13 at 15:25

Jilber Urbina

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@Rinot you might want to accept an answer as the correct one, click in the tick mark right below to the score. – Jilber Urbina Oct 08 '13 at 16:40

score 1 · Answer 2 · answered Oct 03 '13 at 15:32

1

tapply(mydata$amp_temperature,mydata$Country,mean)

answered Oct 03 '13 at 15:32

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How to calculate mean?

2 Answers2