Difference between revisions of "Manuals/calci/CHIDIST"
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4.Here CHIDIST=P(X>x),where X is a X^2 random variable. | 4.Here CHIDIST=P(X>x),where X is a X^2 random variable. | ||
| − | ** | + | **CHIDIST(-2,1)=Error,because x is negative. |
| − | ** | + | **CHIDIST(2,-1)=Error, because df<1 |
==Examples== | ==Examples== | ||
Revision as of 05:17, 12 November 2013
CHIDIST(x,df)
- 'X' is the value for which distribution is evaluated and df is the number of degrees of freedem.
Description
- This function gives the one_tailed probability of the chi-squared distribution.
- It is denoted by X^2 distribution.Normally categorical datas may displayed in tables.
- The X^2 static used to compare the observed value in each table to the value
- which would be the expected under the assumption. The conditions of X^2 test is
1.The table should be 2x2 or more than 2x2 2.Each observations should not be dependent 3.All expected values should be 10 or greater. The test statistic is: X^2=summation(Oi-Ei)^2/Ei The degrees of freedom are: (r–1)(c–1) r =No. of rows and c = No. of columns Where: Oi-the observed value in the ith cell Ei- the expected value in the ith cell Also this function will the result as Error when 1.The x&df values are nonnumeric 2.The x value is negative or df value is not an integer 3. The df <1or df>10^10 4.Here CHIDIST=P(X>x),where X is a X^2 random variable.
- CHIDIST(-2,1)=Error,because x is negative.
- CHIDIST(2,-1)=Error, because df<1
Examples
| CHIDIST(x,df) | x | df | RESULT |
|---|---|---|---|
| CHIDIST(18,2) | 18 | 2 | 0.0001234098 |
| CHIDIST(15,1) | 15 | 1 | 0.0001075112 |
| CHIDIST(2,1) | 2 | 1 | 0.157299207050 |
| CHIDIST(-2,1) | (-)2 | 1 | error |
| CHIDIST(2,-1) | 2 | (-)1 | error |