Re: Chi Square Areas

*To*: mathgroup at smc.vnet.net*Subject*: [mg110922] Re: Chi Square Areas*From*: Norbert Marxer <marxer at mec.li>*Date*: Sun, 11 Jul 2010 06:21:36 -0400 (EDT)*References*: <i199d5$q45$1@smc.vnet.net>

On Jul 10, 10:01 am, Steve <s... at epix.net> wrote: > Hi, > > 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 athttp://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 ? > > Thanks so much. Hello You can use the built-in functions: InverseCDF[ChiSquareDistribution[8], 0.95] InverseCDF[ChiSquareDistribution[5], 0.9] which will give you the numbers 15.5073 and 9.23636. But note, these numbers represent the critical values! The areas (to the right) are given by 0.05 (5%) and 0.10 (10%) respectively. Best Regards Norbert Marxer