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Re: Dollodon status questioned

On 25 March 2011 18:32, Denver Fowler <df9465@yahoo.co.uk> wrote:
> Forwarded for Liz Freedman
>>   I wonder if McDonald uses some more substantive reasoning (optimistically, 
>> I
>>assume he does) than in the abstract -- which is, let's face it, an abstract. 
>>haven't the paper, but will soon.
> Not really - he runs a PCA on a mere 3 measurements for each specimen
> (which would give any statistician a heart attack), and those 3
> measurements are all known to vary with the size of the specimen
> (i.e., likely ontogenetically). Axis 1 (80% of variance) is probably
> based entirely on the size of the specimen, with no real taxonomic
> value.


And do tell, how much variance does PC4 explain?