[R] Problem: No p-value for a point-baserial correlation with R

John Kane jrkrideau at inbox.com
Sat Apr 16 15:54:44 CEST 2016

Hi Dominik
Welcome to R-help 

Please have a look at
http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example and/or http://adv-r.had.co.nz/Reproducibility.html for some suggestions on how to ask questions here.

In particular we probably need to know what packages have the biseral.cor() & cor.biseral() functions and some sample data.

Read the part about dput() carefully. This is the best way to provide sample data to R-help.

BTW try a str(mydata) and check to see that you have the factor levels you think you do.

John Kane
Kingston ON Canada

> -----Original Message-----
> From: d.maiori at windowslive.com
> Sent: Sat, 16 Apr 2016 11:39:47 +0200
> To: r-help at r-project.org
> Subject: [R] Problem: No p-value for a point-baserial correlation with R
> Dear community
> I'm pretty new to R and I'm trying to do a Point-baserial correlation for
> a nominal dichotomous variable with a interval scaled variable. It works
> fine, but the output just shows me the correlation and nothing else
> (p-Value would be important).
> I tried it with the following codes:
> - biseral.cor()
> - cor.biseral()
> - I also tried a polyserial() I've found on this question page:
> http://stackoverflow.com/questions/35880910/point-biserial-and-p-value
> Problem: It's not working (telling me y has fewer than 2 levels) and it
> would also be for a ordinal dichotomous variable, but I only have a
> nominal dichotomous variable.
> In the forum if found following Syntax that I've tried out:
> https://stat.ethz.ch/pipermail/r-help/2003-April/031852.html
> It seams to work because I don't get any error messages but I'm not
> getting an output either.
> I'm really thankful for every help I could get on this topic or tips
> where I can find out and learn how to find a correlation with a p-value
> in R for a nominal dichotomous and an interval scaled variable.
> Thanks in advance and have a nice weekend!
> 	[[alternative HTML version deleted]]
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