[R] Usage of vcd packages.

[Michael Friendly]

On 6/23/15 4:07 PM, My List wrote:
> All,
>
> I am new to the vcd package and new to R too.
Welcome to R and glad you found the vcd package.
>
> 1) I have a lickert analysis based data set.
> 2) I am doing a hypothesis tests on the variables ( like, is there a
> relationship between the choice of a Doctor based on the Patients Income ,
> that's just one example)
> 3) I am building contingency tables ( R x C) and running chiqsqr.test on
> these tables.
>
> These are mostly 2 x 2 tables. In some cases I am getting very low counts
> of the variables in these ( R x C )  tables. I wanted to know at what point
> do I need to use
Your questions are reasonable concerns for someone doing this sort of 
analysis with possibly small cell counts, but without any details,
you are really asking for statistical consulting help, rather than
R-help, and you would be better off posting your questions to
http://stats.stackexchange.com/


> How do I show if there is any association between the variables in the R x
> C setup?Should be I  using oddratio() or or assocstats() or should I use
> Cramers V test for 2 x 2 tables.
odds ratios, Cramer`s V etc. are different ways of quantifying the 
degree of association, with different metrics and different 
interpretations of the numbers.

>
> Please, advice or lead me to a source.
Perhaps the notes from my old short course on categorical data might be 
useful, particularly lecture 2

http://www.datavis.ca/courses/VCD/

More generally, since you`re using vcd, you may find more comfort with 
the visual methods fourfold(), mosaic() and friends than with the
numerical summaries.
>
> *Example of Case - Age of patients and If the Dr Justified a Diagnostic
> Test on them.*
>
>
>
>
>
>
>
> DrJustifyDgntTstNo
>
> DrJustifyDgntTstYes
>
>
>
> Age21-40
>
> 1
>
> 91
>
>
>
> Age41-50
>
> 4
>
> 30
>
>
>
> GtrThan51
>
> 3
>
> 50
>
>
>
>
>
>
>
>
> Thanks in advance,
> Harmeet
>
> 	[[alternative HTML version deleted]]
>