[R] One silly question about "tapply output"

[Vito Muggeo (UniPa)]

dear Vincy,
Firstly, a suggestion: to increase the probability of getting help, you 
should provide reproducible code (people can do "copy-and-paste" of your 
code and to modify the code to obtain the response.. )

However a possible solution (not tested, of course..) could be simply

a<-tapply(rate, rating, mean)
d<-data.frame(rating=names(a),mean=a)


best,
vito


Il 27/10/2010 12.39, Vincy Pyne ha scritto:
> Dear R helpers
>
> I have a data which gives Month-wise and Rating-wise Rates. So the input file is something like
>
> month           rating           rate
> January        AAA             9.04
> February      AAA             9.07
> ..........................................
> ..........................................
> Decemeber     AAA            8.97
> January           BBB           11.15
> February         BBB            11.13
>
>
>
> January          CCC            17.13
> .............................................
> ............................................
> December       CCC           17.56
>
> and so on.
>
> My objective is to calculate Rating-wise mean rate, for which I have used
>
> rating_mean = tapply(rate, rating, mean)
>
> and I am getting following output
>
>> tapply(rate, rating, mean)
>        AAA           BBB                      CCC
>         9.1104       11.1361637            17.1606779
>
> which is correct when compared with an excel output.
>
> However, I wish to have my output something like a data.frame (so that I should be able to save this output as csv file with respective headings and should be able to carry out further analysis)
>
> Rating         Mean
> AAA            9.1104
> BBB           11.1361637
> CCC           17.1606779
>
>
> Please guide as how should I achieve my output like this.
>
> Thanking in advance.
>
> Regards
>
> Vincy
>
>
>
>
>
>
> 	[[alternative HTML version deleted]]
>
>
>
>
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-- 
====================================
Vito M.R. Muggeo
Dip.to Sc Statist e Matem `Vianelli'
Università di Palermo
viale delle Scienze, edificio 13
90128 Palermo - ITALY
tel: 091 23895240
fax: 091 485726/485612
http://dssm.unipa.it/vmuggeo