Non-linear least-squares regression results

ParameterAsymptotic standard errort-statistic for H0 (Parameter = 1)
Citing year effects (Base = 1977)
 19781.1150.034493.32
 19791.2230.037955.88
 19801.3080.039437.80
 19811.4000.042179.48
 19821.5110.0463711.01
 19831.5230.0484210.80
 19841.6060.0520911.64
 19851.6820.0562712.12
 19861.7530.0607312.40
 19871.8910.0672913.24
 19881.9040.0708512.76
 19892.0450.0786813.29
 19901.9330.0779511.97
 19911.9050.0797111.36
 19921.9940.0862711.52
 19931.9560.0891810.73
Cited year effects (Base = 1963–1965)
  1966–19700.7470.02871−8.82
  1971–19750.6910.02820−10.97
  1976–19800.7090.03375−8.62
  1981–19850.6470.03647−9.69
  1986–19900.7280.04752−5.72
Technological field effects (Base = all other)
  Drugs and medical1.4090.0179822.73
  Chemicals excluding drugs1.0490.013313.65
  Electronics, optics, and nuclear1.3600.0160122.51
  Mechanical1.0370.013702.69
Citing country effects (Base = United States)
  Canada0.6470.00938−37.59
  European Economic Community0.5060.00534−92.49
  Japan0.4420.00542−102.99
  Rest of world0.5060.00824−59.93
University/corporate differential by cited time period
  19651.1910.128381.49
  1966–19700.9300.04148−1.70
  1971–19751.1690.024197.00
  1976–19801.2160.0176512.26
  1981–19851.2500.0171814.55
  1986–19901.0620.017463.57
Federal government/corporate differential by cited time period
  1963–19650.7200.04592−6.11
  1966–19700.7390.02498−10.45
  1971–19750.7440.01531−16.71
  1976–19800.7590.01235−19.51
  1981–19850.7540.01284−19.15
  1986–19900.7090.01551−18.78
β1*0.2130.0024786.28
β2*3.86E-061.97E-0719.61
  • Total observations, 26,975; R-square = 0.5161. 

  • t-statistic is for H0, parameter = 0.