[R] statistic test plot

[Andrew Miles]

If you type:

class(z.ex)

you'll see that your z-test produces an object with a class "htest."   
Then type:

methods("plot")

you'll get a list of all the types of objects that the plot() function  
knows how to make plots for.  It doesn't look like plot has a sub- 
method for an htest object, so it probably doesn't know how to handle  
the type of data you are putting into it.

Andrew Miles
Department of Sociology
Duke University

On Sep 27, 2010, at 11:03 PM, Kie Kyon Huang wrote:

> Hi, I am a beginner in R and is trying to plot some dot plot from t  
> test
> result.
> I was following the example
>
> ## Example from z.test -- requires TeachingDemos package
> # library(TeachingDemos)
> # z.ex <- z.test(rnorm(25,100,5),99,5)
> # z.ex
> # plot(z.ex)
>
> but encounter this error for the last command
>
> Error in plot.window(...) : need finite 'xlim' values
>
> In addition: Warning messages:
> 1: In min(x) : no non-missing arguments to min; returning Inf
> 2: In max(x) : no non-missing arguments to max; returning -Inf
> 3: In min(x) : no non-missing arguments to min; returning Inf
> 4: In max(x) : no non-missing arguments to max; returning -Inf
>
> the z.ex looks fine though
>
>
>        One Sample z-test
>
> data:  rnorm(25, 100, 5)
> z = 0.7622, n = 25, Std. Dev. = 5, Std. Dev. of the sample mean = 1,
> p-value = 0.4459
> alternative hypothesis: true mean is not equal to 99
> 95 percent confidence interval:
>  97.80223 101.72216
> sample estimates:
> mean of rnorm(25, 100, 5)
>                  99.7622
>
> Can someone help me out here?
>
> 	[[alternative HTML version deleted]]
>
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