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Friday, May 14, 2010

VARP Function (Functions in Excel)



Values
Values
Values
10
10
10
10
10
11
9
11
9
10
10
12
0.1875
0.1875
1.25
 =VARP(C4:C7)
 =VARP(E4:E7)
 =VARP(G4:G7)

What Does It Do ?
This function calculates the variance of a list of values.
The variance is calculated on the basis that the values represent the entire population.
Syntax
=VARP(Range1,Range2,Range3 through to Range30)
Formatting
No special formatting is needed.
Example
The table below was used by a company interested in buying a new machine
to pack washing powder.
A trial run a just four boxes per machine were produced.
The boxes were weighed and the =VARP() function used as these boxes
represented the entire test run.
The machine with the smallest variance was the most consistent.

Soap Powder Box Filling Machine Test Results
Test 1
Test 2
Test 3
Test 4
Variance
Machine 1
1.4
1.5
1.6
1.5
0.0050
 =VARP(D32:G32)
Machine 2
1.5
1.5
1.4
1.5
0.0019
 =VARP(D33:G33)
Machine 3
1.5
1.6
1.7
1.8
0.0125
 =VARP(D34:G34)


The smallest variance is :
0.0019
 =MIN(H32:H34)
The machine with the smallest variance is :
Machine 2
 =INDEX(C32:C34,MATCH(MIN(H32:H34),H32:H34,0))

Explanation of formula:
This finds the lowest value.
 =(MIN(H32:H34)
This finds the position of the lowest value.
 =MATCH(MIN(H32:H34),H32:H34,0)
This looks down the Machine column to
 =INDEX(C32:C34,MATCH(MIN(H32:H34),H32:H34,0))
find the machine name.

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