Following up on this post printing some comments from Professor Michael McDonald on the Katz expert report in the Washington state gubernatorial litigation, McDonald has written this post to the election law list that begins: “With regards to my earlier analysis of Jonathan Katz expert report in the Washington recount case, which is linked to in Rick’s news of the day, I must perform a mea culpa. In my analysis, I did not convert percentages back into ballots and thus drew an incorrect conclusion. Dr. Katz’s measures of uncertainty appear to be correct, as far as I can tell without the benefit of examining the actual data.”