Description

Wooldridge Source: See RDCHEM.RAW Data loads lazily.

Usage

Format

A data.frame with 29 observations on 6 variables:

• rd: R&D spending, millions $

• sales: firm sales, millions $

• rdintens: rd as percent of sales

• lrd: log(rd)

• lsales: log(sales)

• salessq: sales^2

Notes

According to these data, the R&D/firm size relationship is different in the telecommunications industry than in the chemical industry: there is pretty strong evidence that R&D intensity decreases with firm size in telecommunications. Of course, that was in 1991. The data could easily be updated, and a panel data set could be constructed.

Used in Text: not used

Source

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

Examples