RDD.
stats
Return a StatCounter object that captures the mean, variance and count of the RDD’s elements in one operation.
StatCounter
New in version 0.9.1.
a StatCounter capturing the mean, variance and count of all elements
See also
RDD.stdev()
RDD.sampleStdev()
RDD.variance()
RDD.sampleVariance()
RDD.histogram()
pyspark.sql.DataFrame.stat()