Tuesday, December 9, 2008

Violation of homoskedasticity?

Photobucket

Sorry if it is not okay to ask this outright, but does this look okay?  I went ahead and tried the transformations and it got progressively worse. Should I include in my write-up that I tried to transform but it got worse, or should I just say this is "good enough" and only include my first tests of assumptions?

1 comment:

Mari said...

Note that you tried transformations, but that the violations were not improved but in fact worsened.

The issue with this distribution is really pretty confined to the four observations to the far left of the graph. The rest of it is really fine, so I wouldn't worry too much about the four.