rdchem

Wooldridge Source: From Businessweek R&amp;D Scoreboard, October 25, 1991. Data loads lazily.

datasets

Students learning both econometrics and R may find the introduction
to both challenging. The wooldridge data package aims to lighten the task by efficiently
loading any data set found in the text with a single command. Data sets have been
compressed to a fraction of their original size. Documentation files contain page numbers,
the original source, time of publication, and notes from the author suggesting avenues for
further analysis and research. If one needs an introduction to R model syntax, a
vignette contains solutions to examples from chapters of the text.
Data sets are from the 7th edition (Wooldridge 2020, ISBN-13 978-1-337-55886-0),
and are backwards compatible with all previous versions of the text.

Justin Shea

wooldridge

115 Data Sets from "Introductory Econometrics: A Modern
Approach, 7e" by Jeffrey M. Wooldridge

Justin M. Shea

Kennth H. Brown

rdchem function

A data.frame with 32 observations on 8 variables:<ul>
<li>rd: R&amp;D spending, millions</li>
<li>sales: firm sales, millions</li>
<li>profits: profits, millions</li>
<li>rdintens: rd as percent of sales</li>
<li>profmarg: profits as percent of sales</li>
<li>salessq: sales^2</li>
<li>lsales: log(sales)</li>
<li>lrd: log(rd)</li>
</ul>

Format

It would be interesting to collect more recent data and see whether the R&amp;D/firm size relationship has changed over time.
Used in Text: pages 64, 139-140, 159-160, 204, 218, 327-329, 339

rdchem: rdchem

Description

Usage

Arguments

Format

Notes

Examples