A count or summation can tell you a lot about particular fields of data, or your data as a whole.…

Inverted index pattern is used to generate an index from a data set to allow for faster searches or data…

A standard deviation shows how much variation exists in the data from the average, thus requiring the average to be…

Problem to Solve : Given a list of employees with there department and salary find the average salary in each…

Numerical Summarizations is a map reduce pattern which can be used to find minimum, maximum, average, median, and standard deviation…