mediansdevn

mediansdevn

The mediansdevn function returns the median value and standard deviation of a general lua table that may contain a multi-dimensional array or a mixture of numbers, strings, named keys, and sub-tables. Only numeric values found in the table are used in the calculation. The mediann function returns only the medianvalue. The related mediansdev function calculates the median and standard deviation of a 1-dimensional array, CImage, or list of numbers. Since an array is a specific type of table that contains only numbers or sub-tables, this function can also be used for arrays.

Syntax

nMedian, nStdDev = mediansdevn( tbl )

tbl is a general lua table.

nMeian is the median value of the data.

nStdDev is the standard deviation of the data.

Examples

The following script returns the median and standard deviation of a 1-dimensional array containing 1 million random numbers.

t = random( 1000000 )	-- create an array of numbers
v, s = mediansdevn( t )	-- find the median & standard deviation
Printf("Median=%lg, Sdev = %lg\n", v, s )	-- list the result

The next example computes the median and standard deviation of an ugly, complex table:

t = { 6, -2, 15, "a", {5,"b"}, c="5.4" }
v, s = mediansdevn(t)	-- find the meian and standard deviation
Printf("M = %lg, S = %lg\n", v, s )	-- result: M = 5.5, based on only 4 numbers

Syntax

Examples

Related Topics