From: tornanddesperate <MatthiasNeff_at_gmx.ch>

Date: Sat, 07 May 2011 11:24:18 -0700 (PDT)

Date: Sat, 07 May 2011 11:24:18 -0700 (PDT)

Hi its me again

I don't mean to get on your nerves, but the use of R proofs to be a bit more complicated than envisaged.

I would like to calculate the mean of a group of values, here "wage_accepted". The group is determined by the stage and period, so in the end there should be a column with the values of the wages in period 1 stage1, period 1 stage 2, period 2 stage1... Unfortunately, I haven't much of a clue on how to program this. Could you tell me how the function should roughly look like – if-else, loops included or not – in the end ?

treatment session period stage wage_accepted type

1 1 1 1 1 25 low 2 1 1 1 1 19 low 3 1 1 1 1 15 low 4 1 1 1 2 32 high 5 1 1 1 2 13 low 6 1 1 1 2 14 low 7 1 1 2 1 17 low 8 1 1 2 1 12 low

I am also very grateful if someone could point out a good internet tutorial resource for R functions such as if-else and loops and how to use them in conjunction with tables. It should contain simple examples if possible.

As ever indepted to you,

Matthias

-- View this message in context: http://r.789695.n4.nabble.com/how-to-calculate-the-mean-of-a-group-in-a-table-tp3505986p3505986.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help_at_r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.Received on Sat 07 May 2011 - 19:15:46 GMT

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