In an interview with the Boston Globe, Raymond Bradley said that the hockey stick is built like an “outhouse”.
Bradley told the reporter that he’d built his outhouse out of brick – fancying himself, I guess, as the academic equivalent of the Third Little Pig.
No one has ever accused the Team of statistical sophistication and Bradley’s present distinction of reconstruction validity according (presumably) to the broad outhouse categories of brick, sticks and straw is perhaps an improvement on past statistical standards.
Most CA readers know that the MBH outhouse was actually built of bristlecone pine from the high and dry US southwest – the outhouse shown at left also coming from the high (9126 feet) dry US southwest (hike described here.)
The more recent Mann et al 2008 was built at least, in part, out of mud. While the part using mud may well have been built robustly, it was also built upside down. A definite disadvantage when the outhouse is put to use.
Update: Jeff Id reports the two-level outhouse shown in the following picture. As in MBH98-99, calibration is done on the upper level and verification on the lower level, with the verification statistics finding their own level. The canonical hockey stick shape is robustly derived from the altitude of the Team member as he climbs up the stairs in order to do his calibration.