In the Materials and Methods, sub-section headed Statistical analysis, the two equations given are not correct. They should read:
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20160329070010691-0450:S0021859613000051_eqnU1.gif?pub-status=live)
and
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20160329070010691-0450:S0021859613000051_eqnU2.gif?pub-status=live)
Published online by Cambridge University Press: 11 February 2013
In the Materials and Methods, sub-section headed Statistical analysis, the two equations given are not correct. They should read:
and