I have not said that it is.

I didn't meant to imply you did, I just wanted to emphasise that data is gained by the racial breakdown. Especially in the American context, race sits at the strange junction of appearance, class, heritage, ethnicity, religion and subculture. And its hard to capture it by any of these metrics.

I am not sure what exact sociological data we may extract from the survey, but in any case, the comparison to standard American sociological datasets will be problematic because the LW data are contaminated by presence of non-Americans and there is no way to say how much, because people were not asked about that.

Once we have data on how many are American (and this is something we really should have) this will be easier to say.