Altair® Panopticon

 

Stdevp

The Population Standard Deviation of the selection.

The Stdevp deals with the complete population whereas Stdev deals with a population sample only.

The formula:

http://www.mathsisfun.com/data/images/standard-deviation-formula.gif

 

Sample 1:

Population: A set of data that is all inclusive.

Populations are often very large. For simplicity, imagine the following as an example:

12,6,12

Compute the Stdevp:

Steps:

1.     Determine the mean of the sample

12+6+12/3=10

2.     Square the difference between each item and the mean

(12-10)^2 =4

(6-10)^2 =16

(12-10)^2 =4

3.     Calculate the average

4+16+4/3=24/3

4.     Calculate the square root

√8 or 2.8284


 

Sample 2

Given the following sample fields:

Number

Arbitrary

Negative Values

Positive Values

One

Binary

Currency

Decimal

1

3

-1

1

1

0

$1.00

1.01

2

2

-2

2

 

1

$10.00

2.02

3

1

-3

3

 

0

$100.00

3.03

4

0

-4

4

 

1

$1,000.00

4.04

5

-1

-5

5

 

0

$10,000.00

5.05

6

-2

-6

6

 

1

-$1.00

6.06

7

-3

-7

7

 

0

-$10.00

7.07

8

0

-8

8

 

 

-$100.00

8.08

9

0

-9

9

 

 

-$1,000.00

9.09

10

0

-10

0

 

 

$0.00

0.00

Sample fields.

The Stdevp for each field:

Number

Arbitrary

Negative Values

Positive Values

One

Binary

Currency

Decimal

2.8723

1.6733

2.8723

2.8723

0

0.4949

$3,033.4832

2.9010

The results per field.