subset with two factors

Hey Michael,

Thank you very much. It works!

Best,

Martin

-------- Original-Nachricht --------
Datum: Fri, 10 Dec 2010 22:35:56 +1100
Von: Michael Bedward <michael.bedward at gmail.com>
An: Martin Spindler <Martin.Spindler at gmx.de>
CC: r-help at r-project.org
Betreff: Re: [R] subset with two factors
Hello Martin,

You were almost there :)

T1 <- subset(daten1, Geschlecht=="M" & GG=="A")

Hope this helps.

Michael

On 10 December 2010 22:25, Martin Spindler <Martin.Spindler at gmx.de> wrote:
Dear all,

I have a dataframe of the following strucutre

?numacc_b coverage_b Geschlecht GG
1 ? ? ? ?0 ? ? ? ? ?1 ? ? ? ? ?W ?A
2 ? ? ? ?0 ? ? ? ? ?1 ? ? ? ? ?M ?A
3 ? ? ? ?0 ? ? ? ? ?1 ? ? ? ? ?M ?B
4 ? ? ? ?0 ? ? ? ? ?1 ? ? ? ? ?M ?B
5 ? ? ? ?0 ? ? ? ? ?1 ? ? ? ? ?W ?A
6 ? ? ? ?0 ? ? ? ? ?1 ? ? ? ? ?M ?B

I would like to form a subset consisting of all entries with
Geschlecht=M and GG=A.
Using

T1 <- subset(daten1, Geschlecht=="M", GG=="A")
delievers

data frame with 0 columns and 6 rows

T1 <- subset(daten1, Geschlecht=="M")
delievers

?numacc_b coverage_b Geschlecht GG
2 ? ? ? ? 0 ? ? ? ? ?1 ? ? ? ? ?M ?A
3 ? ? ? ? 0 ? ? ? ? ?1 ? ? ? ? ?M ?B
4 ? ? ? ? 0 ? ? ? ? ?1 ? ? ? ? ?M ?B
6 ? ? ? ? 0 ? ? ? ? ?1 ? ? ? ? ?M ?B
9 ? ? ? ? 0 ? ? ? ? ?1 ? ? ? ? ?M ?B
10 ? ? ? ?0 ? ? ? ? ?1 ? ? ? ? ?M ?B

But I want to select the dataframe according to both factos.

What can I do?

Thank you answers in advance!

Best,

Martin
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