Table 2.

Parameter estimates for the citation model for zi,p in Eq. 8 using only the publications with yp2003

DatasetAlnapRptplnNi(tp)lnSi(tp)Nobs.Adj. R2
All3770.263±0.0240.202±0.0230.061±0.0040.062±0.0660.065±0.07268,5890.27
(Std. coeff.)0.135±0.0120.129±0.0150.039±0.0030.044±0.0460.050±0.055
P value0.0000.0000.0000.3470.367
Biology (Top)1000.263±0.0390.213±0.0330.029±0.0070.138±0.1020.062±0.11222,1350.12
P value0.0000.0000.0000.1770.578
Biology (Other)550.579±0.0530.152±0.0660.031±0.0150.179±0.0950.211±0.0944,8010.20
P value0.0000.0260.0400.0650.029
Physics (Top)1000.139±0.0430.230±0.0440.070±0.0070.277±0.1180.119±0.13522,6730.19
P value0.0020.0000.0000.0210.380
Physics (Other)1220.272±0.0420.235±0.0490.060±0.0080.082±0.0950.017±0.10418,9800.19
P value0.0000.0000.0000.3890.870
  • Each fixed-effects model was calculated using robust SEs, implemented by the Huber/White/sandwich method. Values significant at the p0.04 level are indicated in boldface. Std. coeff., the estimates of the standardized (beta) coefficients; All, the combination of all datasets.