Traffic

An experiment was performed in Sweden in 1961--2 to assess the
 effect of a speed limit on the motorway accident rate. The
 experiment was conducted on 92 days in each year, matched so that
 day <code>j</code> in 1962 was comparable to day <code>j</code> in 1961. On some days
 the speed limit was in effect and enforced, while on other days
 there was no speed limit and cars tended to be driven faster.
 The speed limit days tended to be in contiguous blocks.

datasets

Functions and datasets to support Venables and Ripley,
"Modern Applied Statistics with S" (4th edition, 2002).

Brian Ripley

MASS

Support Functions and Datasets for Venables and Ripley's MASS

Bill Venables

Kurt Hornik

Albrecht Gebhardt

David Firth

Traffic function

This data frame contains the following columns:<dl>
 <dt><code>year</code></dt>
<dd>1961 or 1962.</dd> <dt><code>day</code></dt>
<dd>of year.</dd> <dt><code>limit</code></dt>
<dd>was there a speed limit?</dd> <dt><code>y</code></dt>
<dd>traffic accident count for that day.</dd> 
</dl>

Format

Effect of Swedish Speed Limits on Accidents — Traffic

This data frame contains the following columns:<dl>
 <dt><code>year</code></dt>
<dd>1961 or 1962.</dd>

 <dt><code>day</code></dt>
<dd>of year.</dd>

 <dt><code>limit</code></dt>
<dd>was there a speed limit?</dd>

 <dt><code>y</code></dt>
<dd>traffic accident count for that day.</dd>

 
</dl>

Traffic: Effect of Swedish Speed Limits on Accidents

Description

Usage

Arguments

Format

References