On page 1078 the equation for bias B″ contains some errors. The correct version of the equation is given below:
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20160921044650206-0159:S003329171100170X:S003329171100170X_eqnU1.gif?pub-status=live)
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20160921044650206-0159:S003329171100170X:S003329171100170X_eqnU2.gif?pub-status=live)
Published online by Cambridge University Press: 26 August 2011
On page 1078 the equation for bias B″ contains some errors. The correct version of the equation is given below: