'FALSE' is a string, which somehow when converted to a boolean
evaluates as True.
How do you like:
>>> kwargs={'df':25,'lower.tail':False}
>>> print ro.r['qt'](0.05, **kwargs)
[1] 1.708141
2009/2/4 Lindsey Bangay <l.ban...@ru.ac.za>:
> HI
>
> I am new to rpy2, but I would appreciate some assistance on this problem
>
> I want to calculate the quantile of the t-distribution, using the upper tail:
>>>>import rpy2.robjects as ro
>>>>kwargs={'df':25,'lower.tail':'FALSE'}
>>>>print ro.r['qt'](0.05, **kwargs)
>
> but this is what I get :
>
> Warning message:
>
> In function (p, df, ncp, lower.tail = TRUE, log.p = FALSE) :
> NAs introduced by coercion
>
> [1] -1.708141
>
> I am using the latest rpy2, R version 2.8.1 (2008-12-22)
> and python2.6
>
> Any help or insight, particularly if it is simple finger trouble on my part,
> appreciated.
>
> I do realise that I can easily workaround this to get what I want from this
> answer, but I do not understand why it is not producing the expected answer
> that I would get in R, as in
>> qt(p=0.05, df=25,lower.tail=FALSE)
> [1] 1.708141
>
>
> Thanks
> Lindsey
> --
> Lindsey Bangay
> Dept of Statistics, Rhodes University, Grahamstown
> South Africa
> +27 46 6038347 (work)
> +27 46 6222723 (fax)
>
>
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