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Re: Chi Square Areas

• To: mathgroup at smc.vnet.net
• Subject: [mg110909] Re: Chi Square Areas
• From: Bill Rowe <readnews at sbcglobal.net>
• Date: Sun, 11 Jul 2010 06:19:13 -0400 (EDT)

On 7/10/10 at 4:01 AM, s123 at epix.net (Steve) wrote:

>Can someone show me how to get Mathematica to provide the areas to
>the right of a given critical value of the Chi Square distribution ?

>The table entries shown at
>http://www2.lv.psu.edu/jxm57/irp/chisquar.html are what I need to
>compute.

>For example, given 8 degrees of freedom and a probability value of
>0.05 the result would be 15.51.

>And given 5 degrees of freedom with probability 0.1 the result is
>9.24.

>How can I produce these results in Mathematica ?

Use Quantile. For example,

In[3]:= Quantile[ChiSquareDistribution[8], .95]

Out[3]= 15.5073

In[5]:= Quantile[ChiSquareDistribution[5], .9]

Out[5]= 9.23636