From: Peter Ehlers <ehlers_at_ucalgary.ca>

Date: Wed, 09 Mar 2011 08:21:21 -0800

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. Received on Wed 09 Mar 2011 - 16:25:48 GMT

Date: Wed, 09 Mar 2011 08:21:21 -0800

On 2011-03-09 07:53, Richard and Barbara Males wrote:

> Thank you for your prompt reply, I apologize for posting as an R

*> Commander question. Your response is pointing me in the right
**> direction, but I am still not quite there. The triangle package has
**> a qtriangle and dtriangle. The formal arguments are a, b, and c.
**> (formals(qtriangle)) When I use R Commander as:
**>
**> qqPlot(Transfer5000$Transfer.Rate, dist="triangle", a=3000,b=5000,c=4000)
**>
**> I get the error message:
**>
**> Error in qqPlot.default(Transfer5000$Transfer.Rate, dist = "triangle", :
**> argument 5 matches multiple formal arguments
**>
**> and I am unclear as to how to specify that the "c" argument needs to
**> pertain specifically to the qtriangle (or perhaps dtriangle) function
**> arguments, that is, how to avoid a conflict with other arguments of
**> qqPlot that are ambiguous when passed "c"..
**>
**> Again, sorry to post here, as this has clearly wandered into other
**> territory. My exploratory searches to resolve this take me well
**> beyond my current ability in R. If there is not an obvious answer, I
**> will re-post specifically on the topic of specifying formal arguments
**> of distributions to qqPlot.
*

Dick,

I think that the author of the triangle package has chosen an unfortunate name for one of the parameters. Here's a work-around:

## define two new functions dtri() and qtri():

dtri <- function(q, a=0, b=1, cc=.5) dtriangle(q, a, b, cc) qtri <- function(p, a=0, b=1, cc=.5) qtriangle(p, a, b, cc)

## now use "tri" as the distribution to pass to qqPlot:

qqPlot(x, "tri", a=3000, b=5000, cc=4000)

Peter Ehlers

*>
*

> Thanks.

*>
**> Dick Males
**>
**> On Tue, Mar 8, 2011 at 11:19 AM, John Fox<jfox_at_mcmaster.ca> wrote:
**>> Dear R. Males,
**>>
**>> This isn't really an R Commander question, since the qqPlot() function is in
**>> the car package and is just invoked by the R Commander.
**>>
**>> From ?qqPlot: "distribution: root name of comparison distribution - e.g.,
**>> "norm" for the normal distribution ... Any distribution for which quantile
**>> and density functions exist in R (with prefixes q and d, respectively) may
**>> be used." Thus, if there's a qtriangle() and dtriangle(), I suppose that you
**>> should be able to get a QQ plot. Further from ?qqPlot: " ... arguments
**>> such as df to be passed to the appropriate quantile function." Thus, you
**>> should *name* the arguments to be passed to qtriangle() -- perhaps (of
**>> course, you should use the correct names) min=3000, max=5000, mode=4000.
**>>
**>> I hope this helps,
**>> John
**>>
**>> --------------------------------
**>> John Fox
**>> Senator William McMaster
**>> Professor of Social Statistics
**>> Department of Sociology
**>> McMaster University
**>> Hamilton, Ontario, Canada
**>> http://socserv.mcmaster.ca/jfox
**>>
**>>
**>>
**>>
**>>> -----Original Message-----
**>>> From: r-help-bounces_at_r-project.org [mailto:r-help-bounces_at_r-project.org]
**>>> On Behalf Of Richard and Barbara Males
**>>> Sent: March-08-11 10:49 AM
**>>> To: r-help_at_r-project.org
**>>> Subject: [R] R Commander QQ Plot with triangular distribution
**>>>
**>>> I am attempting to use the R Commander Graphs Quantile-Comparison
**>>> functionality on a dataset, to compare with a triangular distribution.
**>>> I have the package triangle. My question is on the syntax of how
**>>> to specify the parameters of the theoretical distribution in the
**>>> Parameters field of the dialog box. For example, the theoretical
**>>> distribution has min of 3000, max of 5000, mode of 4000. When I
**>>> enter this info as 3000,5000,4000 in the parameters field, I get:
**>>>
**>>> qqPlot(EmpiricalData$Value, dist="triangle", 3000,5000,4000)
**>>>
**>>> it produces a plot, but I am not sure that this is correct.
**>>>
**>>> I have searched for examples, not found anything. Any help much
**>>> appreciated.
**>>>
**>>> R. Males
**>>> Cincinnati, Ohio, USA
**>>>
**>>> ______________________________________________
**>>> 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.
**>>
**>>
**>
**> ______________________________________________
**> 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.
*

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