Estimates variance based on a sample. In addition to numbers, text and logical values such as TRUE and FALSE are included in the calculation.
Value1,value2, ... are 1 to 30 value arguments corresponding to a sample of a population.
- VARA assumes that its arguments are a sample of the population. If your data represents the entire population, you must compute the variance using VARPA.
- Arguments that contain TRUE evaluate as 1; arguments that contain text or FALSE evaluate as 0 (zero). If the calculation must not include text or logical values, use the VAR worksheet function instead.
- VARA uses the following formula:
Suppose 10 tools stamped from the same machine during a production run are collected as a random sample and measured for breaking strength. The sample values (1345, 1301, 1368, 1322, 1310, 1370, 1318, 1350, 1303, 1299) are stored in A2:E3, respectively. VARA estimates the variance for the breaking strength of the tools.
VARA(A2:E3) equals 754.3