Using JMP - SAS

400 Formula Functions Reference Appendix B
Transcendental Functions
Squish
Is an efficient computation of the function 1 / (1+e -x ), where x is any numeric column, variable, or
expression.
Root
Calculates the root of its argument as specified by the index. Root initially shows with an index of 2. To
change the index, highlight the index argument and enter the value that you want.
Factorial
Returns the product of all numbers 1 through the argument that you specify. For example, Factorial(5)
evaluates as 120.
NChooseK
Returns the number of n things taken k at a time (n select k) and is computed in the standard way using
factorials, as n! / (k!(n – k)!). For example, NChooseK(5,2) evaluates as 10.
NChooseK Matrix
Returns a matrix of n things taken k at a time (n select k)
Beta
Adds the two parameter Beta function and is written terms of the Gamma function as:
Bmn) ( , )
=
Γ( m)Γ( n)
------------------------
Γ( m + n)
Gamma
Adds the Gamma function, denoted Γ(i), and is defined as:
∞
Γ() i = ( x i – 1 )( e – x )dx
0
Gamma with a single argument is the same as Gamma(x, infinity). The optional second argument changes
the upper integer from infinity to the value that you enter. Other interesting gamma function relationships
are
• for any α > 1, Γ(α) = (α–1) • Γ(α–1)
• for any positive integer, n, Γ(n) = (n-1)!
• Γ(0.5) = the square root of π