[R] how to...

[casot at libero.it]

for example:
I have got these data, organized in a dataframe. 

		sample1	sample2	sample3	sample4	group
replicate1	1.00	0.02	0.35	0.50	A
replicate2	1.00	0.02	1.54	1.11	A
replicate3	1.00	0.02	1.54	1.11	A
replicate4	1.00	0.02	1.54	1.11	A
replicate5	1.00	0.10	0.18	0.72	B
replicate6	1000.00	0.75	0.86	7.26	B
replicate7	1000.00	0.75	0.18	0.36	B
replicate8	1000.00	0.75	12.09	0.74	B
replicate9	1000.00	0.75	12.09	0.84	C
replicate10	1000.00	0.98	0.65	0.50	C
replicate11	2.00	6.00	6.00	2.00	C
replicate12	6.00	6.00	2.00	6.00	C


the first four columns represent the diffent sample I have to test with ANOVA.the last column is related to the group of each entry. Using "aov()" I can run a test on each column. but I would like to run the ANOVAs for each colum (that in my case are hundreds) in an automated way. I can't set up a working script with the "loop" in this case, surely because of my scarce knowledge in programming. can you help me? 
the next problem is how to collect the results in a simple way. for example having them organized in a table such as


SAMPLE ANOVA
sample1 ok
sample2 ok
sample3 not significant
....

	
thank you so much


---------- Initial Header -----------

>From      : "Petr Pikal" petr.pikal at precheza.cz
To          : "casot at libero.it" casot at libero.it,"R Help" R-help at stat.math.ethz.ch
Cc          : 
Date      : Thu, 15 Mar 2007 20:38:25 +0100
Subject : Re: [R] how to...







> Hi
> 
> I suppose you will not get usefull response for such poorly specified 
> question. 
> 
> For automating procedures on data frames you can either do looping or 
> use lapply or maybe do.call can also provide some functionality.
> 
> If you elaborate what you did and in what respect it was 
> unsatisfactory maybe you will get better answer.
> 
> Anyway, before your next post you shall look to posting guide.
> 
> Regards
> Petr
> 
> 
> 
> On 15 Mar 2007 at 17:20, casot at libero.it wrote:
> 
> Date sent:      	Thu, 15 Mar 2007 17:20:57 +0100
> From:           	"casot at libero.it" <casot at libero.it>
> To:             	"R Help" <R-help at stat.math.ethz.ch>
> Subject:        	[R] how to...
> 
> > I have to perform ANOVA's on many different data organized in a
> > dataframe. I can run an ANOVA for each sample, but I've got hundreds
> > of data and I would like to avoid manually carrying out each test. in
> > addition, I would like to have the results organized in a simple way,
> > for example in a table, wich could be easy to export. thank you for
> > assistance
> > 
> > simone 
> > 
> > 
> > ------------------------------------------------------
> > Leggi GRATIS le tue mail con il telefonino i-mode  di Wind
> > http://i-mode.wind.it
> > 
> > ______________________________________________
> > R-help at stat.math.ethz.ch 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.
> 
> Petr Pikal
> petr.pikal at precheza.cz
> 
> ---------- Initial Header -----------

>From      : "Petr Pikal" petr.pikal at precheza.cz
To          : "casot at libero.it" casot at libero.it,"R Help" R-help at stat.math.ethz.ch
Cc          : 
Date      : Thu, 15 Mar 2007 20:38:25 +0100
Subject : Re: [R] how to...







> Hi
> 
> I suppose you will not get usefull response for such poorly specified 
> question. 
> 
> For automating procedures on data frames you can either do looping or 
> use lapply or maybe do.call can also provide some functionality.
> 
> If you elaborate what you did and in what respect it was 
> unsatisfactory maybe you will get better answer.
> 
> Anyway, before your next post you shall look to posting guide.
> 
> Regards
> Petr
> 
> 
> 
> On 15 Mar 2007 at 17:20, casot at libero.it wrote:
> 
> Date sent:      	Thu, 15 Mar 2007 17:20:57 +0100
> From:           	"casot at libero.it" <casot at libero.it>
> To:             	"R Help" <R-help at stat.math.ethz.ch>
> Subject:        	[R] how to...
> 
> > I have to perform ANOVA's on many different data organized in a
> > dataframe. I can run an ANOVA for each sample, but I've got hundreds
> > of data and I would like to avoid manually carrying out each test. in
> > addition, I would like to have the results organized in a simple way,
> > for example in a table, wich could be easy to export. thank you for
> > assistance
> > 
> > simone 
> > 
> > 
> > ------------------------------------------------------
> > Leggi GRATIS le tue mail con il telefonino i-mode  di Wind
> > http://i-mode.wind.it
> > 
> > ______________________________________________
> > R-help at stat.math.ethz.ch 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.
> 
> Petr Pikal
> petr.pikal at precheza.cz
> 
> 


------------------------------------------------------
Passa a Infostrada. ADSL e Telefono senza limiti e senza canone Telecom
http://infostrada.it