Displaying 5 results from an estimated 5 matches for "hesicaia".
2008 Jul 08
3
extracting index list when using tapply()
Hello,
The quick version of my question is how can I extract a matrix instead of
a vector using tapply()? I would like to be able to access both the results
of tapply() and also the index variables.
In case further explanation would help: I am analyzing a large (3million
rows x 9 columns) spatial/temporal dataset and am attempting to calculate
the number of unique years containing any data
2008 Dec 07
2
subsetting large data frames.
Hi all,
I have a question regarding subsetting of large data frames. I have two
data frames ?catches? and ?tows? and they both have the same 30 variables
(columns). I would like to select rows in the data frame ?tows? where all 5
specific variables are NOT matched in ?catches. That is to say, the
combination of these 5 variables is unique. One or more of the variables
could be the same but the
2009 Aug 13
2
glm.nb versus glm estimation of theta.
Hello,
I have a question regarding estimation of the dispersion parameter (theta)
for generalized linear models with the negative binomial error structure. As
I understand, there are two main methods to fit glm's using the nb error
structure in R: glm.nb() or glm() with the negative.binomial(theta) family.
Both functions are implemented through the MASS library. Fitting the model
using these
2008 Jul 08
0
Fwd: Re: extracting index list when using tapply()
...tions and show us what you'd
like, we can then more easily help.
ctu at bigred.unl.edu wrote:
> Hi,
> How about using "subset"?
> x1<-tapply(subset(years, length(area)>20), function(x) length(unique(x)))
>
> I hope this works
> Chunhao
>
>
> Quoting hesicaia <dboyce at dal.ca>:
>
>>
>> Hello,
>> The quick version of my question is how can I extract a matrix instead of
>> a vector using tapply()? I would like to be able to access both the results
>> of tapply() and also the index variables.
>>
>> In c...
2009 Apr 27
3
Formatting numbers
...t; 51. Install packages not working in latest version?
> (Neotropical bat risk assessments)
> 52. Re: Install packages not working in latest version? (Uwe Ligges)
> 53. comparing matrices (Esmail)
> 54. doubt in vglm output (priyabrata panigrahi)
> 55. figure layout (hesicaia)
> 56. Re: ANOVA/statistics question (drmh)
> 57. Re: comparing matrices (ONKELINX, Thierry)
> 58. Problem with create a tree (Grze?)
> 59. Re: THE EQUIVALENT OF SQL INNER TABLE JOIN IN R
> (Wacek Kusnierczyk)
> 60. Re: Memory issues in R (David Winsemius)
>...