Type  Description  Example 

Summary functions, including measures of count, center, spread and position  mean 2 3 5 1 6 3.5 

Probability distributions, discrete and continuous 
⍝ probability of 2 heads in four tosses 4 .5 binomial 2 

Relational Functions, such as eq, ne, gt, lt, between; these functions return a value of 1 (true) or 0 (false)  2 < 3 1 

Logical Functions: not, and, or and if  (2 lt 3) and (4 gt 2) 0 