The VARA function returns the variance of a supplied set of values which represent a sample of a population.
=VARA(num_1,[num_2], … )
Note: Beginning with Excel 2007, you can enter up to 255 number arguments to the function. Excel 2003 would only accept up to 30 number arguments.
|num_1||The first number, cell references or range argument corresponding to a population|
|[num_2], …||Optional. Additional numbers, cell references or ranges for which you want the variance, up to a maximum of 255|
Note: The number arguments must provide a minimum of 2 numeric values to the function.
|14||=VARA(A2:A11)||626.23||Variance of values provided using the VARA function, which assumes that 10 is only a sample population|
Note: The VARA function is used when calculating the variance for a sample of a population. If you are calculating the variance for an entire population, you need to use the VARPA function.
Common Function Error(s)
|Problem||What went wrong|
|#VALUE!||Occurs if any values that are supplied directly to the function are text values that cannot be interpreted as numeric values|
|#DIV/0!||Occurs if fewer than 2 numeric values have been supplied to the function|
Variance is a statistical measure commonly used across a set of values, to identify the amount that the values vary from the average.
When your data set is a sample of a population, rather than an entire population, you should use a slightly modified form of variance, known as the Sample Variance.
The equation for VARA is:
where x is the sample mean of the set of values and n is the sample size.
See Wikipedia for more information on variance.