Search the FAQ Archives

3 - A - B - C - D - E - F - G - H - I - J - K - L - M
N - O - P - Q - R - S - T - U - V - W - X - Y - Z
faqs.org - Internet FAQ Archives

comp.ai.neural-nets FAQ, Part 1 of 7: Introduction
Section - What are cases and variables?

( Part1 - Part2 - Part3 - Part4 - Part5 - Part6 - Part7 - Single Page )
[ Usenet FAQs | Web FAQs | Documents | RFC Index | Sex offenders ]


Top Document: comp.ai.neural-nets FAQ, Part 1 of 7: Introduction
Previous Document: How are layers counted?
Next Document: What are the population, sample, training set,
See reader questions & answers on this topic! - Help others by sharing your knowledge

A vector of values presented at one time to all the input units of a neural
network is called a "case", "example", "pattern, "sample", etc. The term
"case" will be used in this FAQ because it is widely recognized,
unambiguous, and requires less typing than the other terms. A case may
include not only input values, but also target values and possibly other
information. 

A vector of values presented at different times to a single input unit is
often called an "input variable" or "feature". To a statistician, it is a
"predictor", "regressor", "covariate", "independent variable", "explanatory
variable", etc. A vector of target values associated with a given output
unit of the network during training will be called a "target variable" in
this FAQ. To a statistician, it is usually a "response" or "dependent
variable". 

A "data set" is a matrix containing one or (usually) more cases. In this
FAQ, it will be assumed that cases are rows of the matrix, while variables
are columns. 

Note that the often-used term "input vector" is ambiguous; it can mean
either an input case or an input variable. 

User Contributions:

Comment about this article, ask questions, or add new information about this topic:

CAPTCHA




Top Document: comp.ai.neural-nets FAQ, Part 1 of 7: Introduction
Previous Document: How are layers counted?
Next Document: What are the population, sample, training set,

Part1 - Part2 - Part3 - Part4 - Part5 - Part6 - Part7 - Single Page

[ Usenet FAQs | Web FAQs | Documents | RFC Index ]

Send corrections/additions to the FAQ Maintainer:
saswss@unx.sas.com (Warren Sarle)





Last Update March 27 2014 @ 02:11 PM