HP 17bII+ stats bug « Next Oldest | Next Newest »

 ▼ DSS Junior Member Posts: 1 Threads: 1 Joined: Jan 1970 11-13-2004, 03:00 AM (I originally posted this to comp.sys.hp48... with 2 ppl confirming that this is a bug, user beware... just glad i didn't find this while taking a test or something!) ---------------------------------------- This many simply be a misunderstanding of how the calculator works, but if you have one, can you please try the following? (I am using RPN mode) Create a list "X", 5 items: 10 15 20 25 30 Create a list "Y", 5 items: 1003 1005 1010 1011 1014 Do stat calculations on the lists. CALC->MORE->FRCST X Variable is "X" Y Variable is "Y" Switch to LINEAR mode (MODL->LIN) In the FRCST menu press "MORE" until you see the sumX, sumY, sumX2, sumY2... menu (Don't press CORR, M, or B at any point during this time) Verify: sumX = 100 sumY = 5,043 sumX2 = 2,250 sumY2 = 5,086,451 sumXY = 101,000 Now, press "MORE" until you get to the "X Y CORR M B" menu. Press "CORR" to calculate the correlation value. The value displayed should be 0.9826... Now, press "MORE" until you are back at the summation screen. See if the summation values show the following: sumX = 100 sumY = 5,043 sumX2 = 250 sumY2 = 81.20 sumXY = 140 Why did the last 3 sums change??? The same seems to happen if you choose M or B instead of CORR. The only way to get 101,000 for sumXY is to exit the FRCST menu completely and rechoosing the X Y lists again... Pilot error or bug???

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