We need run an ANCOVA checking Weight v Length/Site(SPSS, weight=dependent, site=factor, length=covariante).

After checking assumptions of equal variance we had to log transform the data. Variances were checked again yet were still not equal p<0.05.

Any ideas on how we should attempt to analyse this data as litereature seems to rule out the idea of using any standard non-parametric tests.

Thanks

Roy