> On Oct 6, 2017, at 6:17 PM, Akram Alhadainy <akram2004hatem at
gmail.com> wrote:
>
> Hi,
> I need to write two inequalities depend on cumulative distribution (CDF) of
> beta binomial distribution where alpha and beta are unknown and need to
> find them.
> CDF of betabinomial(2,10,alpha,beta) <0.3<=CDF of
> betabinomial(3,10,alpha,beta)
> and
> CDF of betabinomial(5,10,alpha,beta) <0.8<=CDF of
> betabinomial(6,10,alpha,beta)

It remains unclear what this apparent homework problem us supposed to be
teaching you to do. I see no constraints on alpha and beta, and you have shown
no effort to submit complete code.
> How I can do that using r studio package?
> I tried to do that using pbetabinom but it gives error and could not
> discover this function? How I can define this distribution in r studio?

I'm not a regular user of the rstudio IDE but maybe it incorporates a search
function? In a non-rstudio environment I would suggest:
install.packages("sos")
library(sos)
findFn("betabinomial")
# should also succeed in rstudio.
> Thank you,
> Akram
>
> [[alternative HTML version deleted]]

And learn to post in plain text. Also read these documents.
>
> 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.

David Winsemius
Alameda, CA, USA
'Any technology distinguishable from magic is insufficiently advanced.'
-Gehm's Corollary to Clarke's Third Law