Manuals/calci/CHITEST

CHITEST(ar,er)

• $ar$ is the array of observed values
• $er$ is the array of expected values

Description

• This function gives the Average for given set of numbers.
• Average means Sum of all the given elements is divided by Number of the given elements.
• It is also called Arithmetic mean. i.e If n numbers are given and each number is denoted by a$i$, where $i$=1 to n, then $A.M={\frac {1}{n}}\sum _{i=1}^{n}(ai)={\frac {a1+a2+.....+an}{n}}$.
• In this function N1,N2,... are it can either be numbers,arrays,references of cells or we can enter the logical values directly.
• This function will show the result as Error, when the numbers are error values or text that cannot change into numbers.
• Also if the distribution is symmetric, then we can use this function to find the Central Tendency.
• The three most common measures of Central Tendency are: A.M, Median,& Mode.

A.M:  It is calculated by adding the given set of numbers and divided by the count of the given set of  numbers. 
E.g:Average of 2,4,2,7,2,3 and 5 is 3.6
Median: It is the middle number of a sorted list(Ascending order) of numbers. E.g:The median of 2,2,2,3,4,5,7 is 3
Mode: It is the most frequently  repeated number in a given set of numbers. E.g.The mode of 2,2,2,3,4,5 and 7 is 2

• Sometimes CHITEST returns the error value, when ‘a’ and ‘b’ have a different number of data points.

	Column1	Column2	Column3	Column4
Row1	45	38	0.000313
Row2	10	23
Row3	12	26
Row4	40.5	49.36
Row5	19.56	16.44
Row6	17.05	17.41

Let’s see an example

B C

45 38

10 23

12 26

40.5 49.36

19.56 16.44

17.05 17.41

CHITEST (a, b)

i.e. =CHITEST (B2; C4, B5:C7) is 0.003