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Using JMP - SAS

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Appendix B Formula Functions Reference 401<br />

Trigonometric Functions<br />

LGamma<br />

Is the natural log of the result of the gamma function evaluation. You get the same result using the Log<br />

(natural log) function with the Gamma function. However, the LGamma function computes more<br />

efficiently than do the Log (natural log) and the Gamma functions together. NChooseK is implemented<br />

using LGamma functions. The result is not always an exact integer. If the result is close to an integer, it is<br />

rounded up using the Floor function.<br />

Digamma<br />

The logarithmic derivative of the Gamma function.<br />

Trigamma<br />

The derivative of the Digamma function, or the logarithmic second derivative of the Gamma function.<br />

Arrhenius<br />

Calculates the non-specific component of the Arrhenius relationship that is then multiplied by the<br />

activation energy in the Arrhenius equation.<br />

Arrhenius Inv<br />

The inverse of the Arrhenius function:<br />

Logit<br />

-------------------------<br />

11605<br />

T + 273.15<br />

11605<br />

-------------- <br />

y <br />

– 273.15<br />

Applies the logit transformation to the argument using<br />

logit( x)<br />

Scheffe Cubic<br />

x<br />

= log---------- 1 – x<br />

Is used in fitting certain models. Scheffe Cubic (X1, X2) is equivalent to X1*X2*(X1-X2).<br />

Trigonometric Functions<br />

You can create a formula that supports transcendental functions, such as logarithmic functions for any base,<br />

functions for combinatorial calculations, the Beta function, and several gamma functions. See the Scripting<br />

Guide for details about syntax.

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