|
From: | Tony Richardson |
Subject: | [Octave-bug-tracker] [bug #57606] geometric distribution documentation |
Date: | Wed, 15 Jan 2020 11:54:53 -0500 (EST) |
User-agent: | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.117 Safari/537.36 |
URL: <https://savannah.gnu.org/bugs/?57606> Summary: geometric distribution documentation Project: GNU Octave Submitted by: amrichardson Submitted on: Wed 15 Jan 2020 04:54:51 PM UTC Category: Octave Forge Package Severity: 3 - Normal Priority: 5 - Normal Item Group: Documentation Status: None Assigned to: None Originator Name: Anthony Richardson Originator Email: Open/Closed: Open Discussion Lock: Any Release: 5.1.0 Operating System: Any _______________________________________________________ Details: The help documentation for the geo* statistical functions says that the random variable X is the total number of trials until the the first success. The actual functions returns results that assume that X is the number of failures until the first success (there is on off by one difference). The documentation needs to be changed to be consistent with the implementation. You will find both definitions in the literature. The current Octave implementation seems to be consistent with the MATLAB implementation (based on my looking at the MATLAB documentation). For geopdf the help documentation says: The geometric distribution models the number of failures (X-1) of a Bernoulli trial with probability P before the first success (X). I believe this should be changed to: The geometric distribution models the number of failures (X) of a Bernoulli trial with probability P before the first success. _______________________________________________________ Reply to this item at: <https://savannah.gnu.org/bugs/?57606> _______________________________________________ Message sent via Savannah https://savannah.gnu.org/
[Prev in Thread] | Current Thread | [Next in Thread] |