Manuals/calci/CHIDIST

CHIDIST (Number,DegreeOfFreedom)

• is the value for which distribution is evaluated.
• is the number of degrees of freedom.
• CHIDIST(), returns the one-tailed probability of the chi-squared distribution.

Description

• This function gives the one_tailed probability of the chi-squared distribution.
• It is denoted by distribution.
• Normally categorical data's may displayed in tables.
• The static used to compare the observed value in each table to the assumed value.
• The conditions of 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: The degrees of freedom is: (r–1)(c–1)

• r = No. of rows
• 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 & values are non-numeric
2. The value is negative or value is not an integer
3. The or 4. Here CHIDIST=P(X>x),where X is a random variable.
• CHIDIST(-2,1)=Error, because Number is negative.
• CHIDIST(2,-1)=Error, because Degreeoffreedom<1

ZOS

• The syntax is to calculate CHIDIST in ZOS is CHIDIST(Number,Degreeoffreedom).
• is the value for which distribution is evaluated.
• is the number of degrees of freedom.
• For e.g.,CHIDIST(10..12,5.1..7.1..0.6)
Chi-squared Distribution

Examples

 x df RESULT CHIDIST(Number,Degreeoffreedom) 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 #N/A (NUMBER > 0) CHIDIST(2,-1) 2 -1 null

Related Videos

Chi-Square Distribution