parallel_mean

parallel_mean(mean_a, count_a, mean_b, count_b)

Compute the mean based on stats from two partitions of the data.

See “Parallel Algorithm” in https://en.wikipedia.org/wiki/Algorithms_for_calculating_variance

Parameters:

• mean_a – the mean of partition a

• count_a – the number of elements in partition a

• mean_b – the mean of partition b

• count_b – the number of elements in partition b

Returns:

the mean of the two partitions if they were combined