RDCHEM.DES

rd        sales     profits   rdintens  profmarg  salessq   lsales    lrd      

  Obs:    32

  1. rd                       R&D spending, millions $
  2. sales                    firm sales, millions $
  3. profits                  profits, millions $
  4. rdintens                 rd as percent of sales
  5. profmarg                 profits as percent of sales
  6. salessq                  sales^2
  7. lsales                   log(sales)
  8. lrd                      log(rd)

