rdchem

Description

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

Usage

data('rdchem')

Format

A data.frame with 32 observations on 8 variables:

• rd: R&D spending, millions

• sales: firm sales, millions

• profits: profits, millions

• rdintens: rd as percent of sales

• profmarg: profits as percent of sales

• salessq: sales^2

• lsales: log(sales)

• lrd: log(rd)

Notes

It would be interesting to collect more recent data and see whether the R&D/firm size relationship has changed over time.

Used in Text: pages 64, 139-140, 159-160, 204, 218, 327-329, 339

Source

https://www.cengage.com/cgi-wadsworth/course_products_wp.pl?fid=M20b&product_isbn_issn=9781111531041

Examples

 str(rdchem)