Calculates the standard deviation of the values in the given column of the given dataset, or the standard deviation for a series of numbers specified as arguments. When looking up the standard deviation in a dataset, the column may be specified as an index or as a column name. Any null values in the column are ignored. If there are no rows in the dataset, zero is returned.

stdDev(dataset, column OR number, number...)

For example, suppose you had a table with this dataset in it: