Bland-Altman

Correction: apologies for the mistake in the comment about 16:20 where I said the new method consistently underestimates, which should be the opposite - the new method consistently OVERestimates compared to the old one as most of the new values are higher than the old ones, resulting in the negative bias given the subtraction is old minus new, not the other way around. I also corrected this in the subtitle. Hope this makes sense.