vision

The acuity of vision for seven subjects was tested. The response
is the lag in milliseconds between a light flash and a response in
the cortex of the eye. Each eye is tested at four different powers of lens.
An object at the distance of the second number appears to be at distance
of the first number.

datasets

Books are "Practical Regression and ANOVA in R" on CRAN, "Linear Models with R" published 1st Ed. August 2004, 2nd Ed. July 2014 by CRC press, ISBN 9781439887332, and "Extending the Linear Model with R" published by CRC press in 1st Ed. December 2005 and 2nd Ed. March 2016, ISBN 9781584884248.

Julian Faraway

faraway

Functions and Datasets for Books by Julian Faraway

vision function

A data frame with 56 observations on the following 4 variables.<dl>
 <dt><code>acuity</code></dt>
<dd>a numeric vector</dd> <dt><code>power</code></dt>
<dd>a factor with levels <code>6/6</code> <code>6/18</code> <code>6/36</code> <code>6/60</code></dd> <dt><code>eye</code></dt>
<dd>a factor with levels <code>left</code> <code>right</code></dd> <dt><code>subject</code></dt>
<dd>a factor with levels <code>1</code> <code>2</code> <code>3</code> <code>4</code> <code>5</code> <code>6</code> <code>7</code></dd> 
</dl>

Format

Acuity of vision in response to light flash — vision

A data frame with 56 observations on the following 4 variables.<dl>
 <dt><code>acuity</code></dt>
<dd>a numeric vector</dd>

 <dt><code>power</code></dt>
<dd>a factor with levels <code>6/6</code> <code>6/18</code> <code>6/36</code> <code>6/60</code></dd>

 <dt><code>eye</code></dt>
<dd>a factor with levels <code>left</code> <code>right</code></dd>

 <dt><code>subject</code></dt>
<dd>a factor with levels <code>1</code> <code>2</code> <code>3</code> <code>4</code> <code>5</code> <code>6</code> <code>7</code></dd>

 
</dl>

vision: Acuity of vision in response to light flash

Description

Usage

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Examples