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Estimating from the monthly figures, the 3-month lag time for Oct and April 15 looks about right.

That does seem to make sense. The reason I came up with Nov 15 for the new Jan 15 bonds was because you said Feb was using Dec data. Sounds like Feb is actually using Nov data then (3 month lag)? I find that easier to accept -- it seemed like it was much too fast that they could use Dec data already.

Yep, now that I look closer, I see what they're showing. Feb 1 is starting with the Nov value of 197.6 as the "Ref CPI", and Feb 28 ends with 196.82857, which would be the last adjustment prior to the the Dec value of 196.8.

Also, now that I look at the monthly numbers, 198.4 (the value shown for that "dated date") is precisely in-between the Oct (1?) value of 199.2 and the Nov value of 197.6. So it all makes sense now.

Thanks, this was fun.

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