[MATH-1022] Confused by the API docs for org.apache.commons.math3.analysis.function

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.2
• Fix Version/s: 3.3
• Assignee: Unassigned
• Reporter: David Tonhofer
• Created: 13/Aug/13 09:57
• Updated: 19/May/14 15:13
• Resolved: 13/Aug/13 16:48

Description

Something is wrong or unclear...

We read:

http://commons.apache.org/proper/commons-math/apidocs/org/apache/commons/math3/analysis/function/Logistic.Parametric.html

"Parametric function where the input array contains the parameters
of the logit function, ordered as follows: "

--> But the "logit" function is not the "logistic" function.

http://commons.apache.org/proper/commons-math/apidocs/org/apache/commons/math3/analysis/function/Sigmoid.Parametric.html

"Parametric function where the input array contains the parameters of
the logit function, ordered as follows: "

--> But the "logit" function is not the "sigmoid" function, and what is
the difference between the Logistic Function snd the Sigmoid function?

http://commons.apache.org/proper/commons-math/apidocs/org/apache/commons/math3/analysis/function/Logit.Parametric.html

"Parametric function where the input array contains the parameters of
the logit function, ordered as follows: "

--> That sounds correct.

References:

http://en.wikipedia.org/wiki/Logistic_function
http://en.wikipedia.org/wiki/Logit
http://en.wikipedia.org/wiki/Sigmoid_function