Flavour of the month seems to be revised Ancestry DNA test results, which seem to be more blunt, and to offer less insight into ethnicity before records began.
I have been thinking about a blog on this topic, but it seems to me that, unless we have data to show the stratification of the samples, we cannot know the skewness. In other words, when revised estimates show stronger or weaker association with various ethnicities is that simply because the overall sample has been “swamped” by the predominant ethnicities among those with the inclination and resources to submit a test, and to relate the results to hard facts about actual ancestors? The great majority of matches thrown up by Ancestry have yet to attach a tree.
- if my English, red-haired, blue-eyed, fair-skinned ancestors were from Scandinavia via Normandy (as opposed to direct from Denmark);
- and no one from Normandy is tested (I gather it is illegal in France);
- and other white English and American folk like me have tests in their droves;