The flexmix Package - NexTag Supports Open Source Initiatives
The flexmix Package - NexTag Supports Open Source Initiatives
The flexmix Package - NexTag Supports Open Source Initiatives
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32 patent<br />
logLik-methods<br />
Methods for Function logLik in <strong>Package</strong> ‘<strong>flexmix</strong>’<br />
Description<br />
Evaluate the log-likelihood. This function is defined as an S4 generic in the stats4 package.<br />
Methods<br />
object = <strong>flexmix</strong> Evaluate the log-likelihood of an <strong>flexmix</strong> object<br />
patent<br />
Patents and R&D spending<br />
Description<br />
Usage<br />
Format<br />
Details<br />
<strong>Source</strong><br />
Number of patents, R&D spending and sales in millions of dollar for 70 pharmaceutical and biomedical<br />
companies in 1976.<br />
data("patent")<br />
A data frame with 70 observations on the following 4 variables.<br />
Company Name of company.<br />
Patents Number of patents.<br />
RDS R&D spending per sales.<br />
lgRD Logarithmized R&D spendings (in millions of dollars).<br />
<strong>The</strong> data is taken from the National Bureau of Economic Research R&D Masterfile.<br />
P. Wang, I.M. Cockburn and M.L. Puterman (1998): Analysis of Patent Data - A Mixed-Poisson-<br />
Regression-Model Approach. Journal of Business & Economic Statistics 16 (1), pages 27-41.<br />
References<br />
B.H. Hall, C. Cummins, E. Laderman and J. Mundy (1988): <strong>The</strong> R&D Master File Documentation.<br />
Technical Working Paper 72, National Bureau of Economic Research. Cambridge, MA.
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