Difference between revisions of "Manuals/calci/STDEVA"

Revision as of 13:34, 28 February 2018

STDEVA(n1,n2,n3…)

This function gives the Standard Deviation based on a given sample including the logical value and text.
Standard Deviation is a quantity expressing by how much the members of a group differ from the mean value for the group.
It is the used as a measure of the dispersion or variation in a distribution.
It is calculated as the square root of variance.
In $STDEVA(n1,n2,n3...)$ , $n1,n2,n3...$ , are numbers to find the standard deviation. *Here $n1,$ is required. $n2,n3,..$ are optional.
Instead of numbers we can use the single array or a reference of a array.
$STDEVA$ is defined by the formula:

$S.D={\sqrt {\frac {\sum (x-{\bar {x}})^{2}}{(n-1)}}}$ where ${\bar {x}}$ is the sample mean of x and n is the total numbers in the given data.

It is calculated using "n-1" method.
This function consider our given data as the sample population.
Suppose it consider the data as the entire population, we can use the STDEVPA function.
The arguments can be be either numbers or names, array,constants or references that contain numbers.
Also we can give the text representations of numbers or logical values , like TRUE or FALSE, in a reference.
Suppose the arguments containing TRUE which is evaluate as 1, and the arguments containing FALSE which is evaluate as 0.
Suppose the array contains the empty cells and text values like that values are not considered.
Suppose the function don't want to consider the logical values and text representations of numbers in a reference, we can use the STDEV function.
This function will return the result as error when

   1. Any one of the argument is non-numeric. 
   2. The arguments containing the error values or text that cannot be translated in to numbers.

Spreadsheet
	A	B	C	D	E	F	G
1	208	428	511	634	116	589	907
2	18	25	76	91	107

@@ Line 12: / Line 12: @@
 <math>S.D= \sqrt \frac {\sum(x-\bar{x})^2}{(n-1)} </math>
 where <math> \bar{x} </math> is the sample mean of x and n is the total numbers in the given data.
-*It is calculated using <math> "n-1" </math> method.
+*It is calculated using  "n-1"  method.
 *This function consider our given data as the sample population.
 *Suppose it consider the data as the entire population, we can use the  [[Manuals/calci/STDEVPA  | STDEVPA ]]    function.