Re: what is formula to find out chi-square
- From: iandjmsmith@xxxxxxx
- Date: Tue, 26 Jun 2007 07:29:50 -0700
On 26 Jun, 12:10, Tradeorganizer <tradeorgani...@xxxxxxxxx> wrote:
Hi
please help to find out the chi square distribution formula , as i am
hainv the value of observed frequecncy and expected frequency , since
i am trying to find out the chi - squre in programming language called
asp( active server pages ) in which you cannot use the formula of
excel.
its easy to find in Microsoft excel the formula is chidist( x , 1) and
its gives you the value , but using the scripting language i need the
exact formula how to find the chiquare without using excel
so if any body can suggest any link or exact forumla to find out chi -
square for the degree of one then i use that same in my script.
Regards
You can find Javascript code for the chi-square cdf at <http://
members.aol.com/iandjmsmith/CHI2EX.HTM>. This includes the file
<http://members.aol.com/iandjmsmith/myfunctions.js>.
Note Excel's CHIDIST(x,df) returns 1-cdf_chi_square(x,df).
If you really only want values for 1 degree of freedom then
CHIDIST(x,1) = 2*cdf_normal(-x*x)
This would allow you to cut out most of the code in <http://
members.aol.com/iandjmsmith/myfunctions.js>.
If you do not need great accuracy then you could probably get by with
a table of the normal cdf and simple interpolation.
Ian Smith
.
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