At 02:05 PM 10/10/02 +0200, Jan Malte Wiener wrote: >hi, >hopefully a simple one -> > >let's assume i have data like this: >subject A: 1,0,1,1,0,1,1,1 -> mean=6/8=0.75 >subject B: 1,1,1 -> mean=3/3=1 > >weighted arithmetic mean of A+B-> (8*0.75 + 3*1)/11 = 0.82 >-> well that was easy, but what if i do have 20 subjects like this and i >want to compare their weighted arithmetic mean to the weighted mean of >another group of 20 subjects ?? i guess i need to weight every single >subject-mean before running any stat-test. and here is my problem: how >do i weight the individual subject means ??
if you are comparing, say, using a t test for differences in means as an example, the means have been weighted already if mean 1 is based on n=20 and mean 2 is based on n=15 ... the means have n taken into account the problem arises f someone asks you what is the average of the TWO groups ... and you just take mean 1 + mean 2 and divide by 2 other than that, i am not quite sure what you are referring to >thanks for any help, >jan >. >. >================================================================= >Instructions for joining and leaving this list, remarks about the >problem of INAPPROPRIATE MESSAGES, and archives are available at: >. http://jse.stat.ncsu.edu/ . >================================================================= Dennis Roberts, 208 Cedar Bldg., University Park PA 16802 <Emailto: [EMAIL PROTECTED]> WWW: http://roberts.ed.psu.edu/users/droberts/drober~1.htm AC 8148632401 . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
