# Manuals/calci/STDEVA

STDEVA()

• Parameters are set of numbers.
• STDEVA(), estimates standard deviation based on a sample, including numbers, text, and logical values.

## Description

• 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 , Parameters are set of numbers to find the standard deviation.
• Here First parameter is required. From the second parameter are optional.
• Instead of numbers we can use the single array or a reference of a array.
• is defined by the formula: where 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.