[R] A small nag

[Joshua Wiley]

On Sun, Aug 14, 2011 at 7:21 PM, Chintanu <chintanu at gmail.com> wrote:
> Hi Joshua,
>
> SORRY for not making that clear. I wish to have the correlation values
> between each column of my "file" with the "LGD". For example:
>
> cor (Column 1, LGD)
> cor (column 2, LGD) ... so on.

Okay, you need to make a tractable example.  Create or give us data
where cor(Column1, LGD) works.  LGD is a vector of length 8, file is
probably some sort of matrix or data frame, which you are extracting
part of, but there are way too many possible ways to repeat,
transpose, twist, and otherwise manipulate the data into some sort of
correlatable form (using rep() is not sufficient---that just gives you
a really long vector).

If you are currently under the impression that it is possible to
correlate a 47231 x 1 matrix with a vector of length 8, read the
Wikipedia page so you understand how correlation works:
http://en.wikipedia.org/wiki/Correlation_and_dependence.

>
> The first one you have provided is producing an error :
>
>> sapply(file[1:47231, 3:10], FUN = cor, y = rep(LGD, 47231), method =
>> "pearson")
> Error in FUN(X[[1L]], ...) : incompatible dimensions
> Cheers,
> Chintanu
>
>
> ===============================================
>
> On Mon, Aug 15, 2011 at 12:09 PM, Joshua Wiley <jwiley.psych at gmail.com>
> wrote:
>>
>> Hi Chintanu,
>>
>> Do you want the correlation of columns 3:10 of file with the y vector
>> or do you want a correlation matrix of all variables?
>>
>> ## correlation between cols 3:10 and y
>> sapply(file[1:47231, 3:10], FUN = cor, y = rep(LGD, 47231), method =
>> "pearson")
>>
>> ## correlation matrix
>> cor(cbind(file[1:47231, 3:10], rep(LGD, 47231)), method = "pearson")
>>
>> HTH,
>>
>> Josh
>>
>>
>> On Sun, Aug 14, 2011 at 7:02 PM, Chintanu <chintanu at gmail.com> wrote:
>> > Hi,
>> >
>> > I am not sure how to fix the following error.
>> >
>> > LGD <-  c(11.6,   12.3,      15.8,      33.1,      43.5,      51.3,
>> > 67.3,      84.9)
>> >
>> > cor (x=(file [1:47231,3:10]), y= rep (LGD, 47231), method = "pearson")
>> >
>> > Error in cor(x = (file[1:47231, 3:10]), y = rep(LGD, 47231), method =
>> > "pearson") :
>> >
>> >  incompatible dimensions
>> >
>> >> sessionInfo()
>> >
>> > R version 2.13.0 (2011-04-13)
>> >
>> > Platform: i386-pc-mingw32/i386 (32-bit)
>> >
>> > locale:
>> >
>> > [1] LC_COLLATE=English_Australia.1252  LC_CTYPE=English_Australia.1252
>> >   LC_MONETARY=English_Australia.1252
>> > LC_NUMERIC=C                       LC_TIME=English_Australia.1252
>> >
>> > attached base packages:
>> >
>> > [1] stats     graphics  grDevices utils     datasets  methods   base
>> >
>> > loaded via a namespace (and not attached):
>> >
>> > [1] tools_2.13.0
>> >
>> > Thank you.
>> >
>> > Kind regards,
>> >
>> > Chintanu
>> >
>> >        [[alternative HTML version deleted]]
>> >
>> > ______________________________________________
>> > 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.
>> >
>>
>>
>>
>> --
>> Joshua Wiley
>> Ph.D. Student, Health Psychology
>> Programmer Analyst II, ATS Statistical Consulting Group
>> University of California, Los Angeles
>> https://joshuawiley.com/
>
>



-- 
Joshua Wiley
Ph.D. Student, Health Psychology
Programmer Analyst II, ATS Statistical Consulting Group
University of California, Los Angeles
https://joshuawiley.com/