Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
Kinal (1980) showed that k-class estimators for which k < 1 possess all necessary higher moments. A bias approximation to order T- 2 is derived for the general k-class estimator extending the earlier result for 2SLS of Mikhail (1972) thus improving our knowledge of a potentially interesting class of estimators.