aStep1

Derives the first set of observation numbers for forsearch in linear models

 manip 

Identifies potential data outliers and their impact on estimates and
analyses. Tool for evaluation of study credibility. Uses the forward
search approach of Atkinson and Riani, "Robust Diagnostic Regression
Analysis", 2000,<ISBN: o-387-95017-6> to prepare descriptive statistics
of a dataset that is to be analyzed by functions lm {stats}, glm {stats},
nls {stats}, lme {nlme}, or coxph {survival}, or their equivalent in
another language. Includes graphics functions to display the
descriptive statistics.

William Fairweather

forsearch

Diagnostic Analysis Using Forward Search Procedure for Various
Models

aStep1 function

<dl> <dt>yesfactor</dt>
<dd>Logical. TRUE if there are factors in the X matrix</dd> <dt>df1</dt>
<dd>Data frame being analyzed by forward search.</dd> <dt>df1.ls</dt>
<dd>List, each element of which is a factor subset of df1</dd> <dt>inner.rank</dt>
<dd>Rank of X matrix of lm analysis on entire database</dd> <dt>initial.sample</dt>
<dd>Number of random samples from which to take set of
 initial observations</dd> <dt>formulaA</dt>
<dd>Fixed parameter formula of lm function</dd> <dt>nofactform</dt>
<dd>2-sided formula excluding factor variables</dd> <dt>ycol</dt>
<dd>Response column number</dd> <dt>b.d</dt>
<dd>Index of point to begin diagnostic listings</dd></dl>

Arguments

Author

Create Set of Observation Numbers in Step 1 for Linear Model 
Analysis — aStep1

<dl>

 <dt>yesfactor</dt>
<dd>Logical. TRUE if there are factors in the X matrix</dd>

 <dt>df1</dt>
<dd>Data frame being analyzed by forward search.</dd>

 <dt>df1.ls</dt>
<dd>List, each element of which is a factor subset of df1</dd>

 <dt>inner.rank</dt>
<dd>Rank of X matrix of lm analysis on entire database</dd>

 <dt>initial.sample</dt>
<dd>Number of random samples from which to take set of
 initial observations</dd>

 <dt>formulaA</dt>
<dd>Fixed parameter formula of lm function</dd>

 <dt>nofactform</dt>
<dd>2-sided formula excluding factor variables</dd>

 <dt>ycol</dt>
<dd>Response column number</dd>

 <dt>b.d</dt>
<dd>Index of point to begin diagnostic listings</dd>

</dl>

aStep1: Create Set of Observation Numbers in Step 1 for Linear Model Analysis

Description

Usage

Value

Arguments

Author

Details