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Note: STDEV.S replaces the older STDEV function, but has identical behavior. If data represents an entire population, use the STDEV.P function. The STDEV.S function is meant to estimate standard deviation in a sample. I have Males/Females as my x Coordinate and Seated/Walking/Jogging as my Y coordinates and created my double bar graph perfectly with 3 groups of males and females. The STDEV.S function calculates the standard deviation in a sample set of data. Standard deviation is a measure of how much variance there is in a set of numbers compared to the average (mean) of the numbers. HI, I have calculated the means and my std dev of my data points.