Re: Numerical recipes in statistics ???

2002-02-26 Thread David Duffy
. What I > essentially require is a textbook which presents algorithms like Monte > Carlo, Principal Component Analysis, Clustering methods, > MANOVA/MANACOVA methods etc. and provides source code (in C , C++ or > Fortran) or pseudocode together with short explanations of the > algorit

Re: test differences between proportions

2002-02-11 Thread David Duffy
nikolov <[EMAIL PROTECTED]> wrote: > i want to test the difference between two proportions. The problem is that > some elements of these proportions are dependent (i can not isolate them). > That is, the t-statistics does not work. How could i do? Do other kind of > tests exist? Is there a book o

Re: random versus fixed factor

2002-01-15 Thread David Duffy
nd ed is ISBN 0-13-200048-2) this may answer a,b and c at least ;) -- | David Duffy. ,-_|\ | email: [EMAIL PROTECTED] ph: INT+61+7+3362-0217 fax: -0101/ * | Epidemiology Unit, The Queensland Institute of Medical Research \_,-._/

Re: Who said "Correlation does not imply causation".

2001-12-04 Thread David Duffy
;, in time-series data, as it happens. They don't give a source for the actual phrase, but quote a section from GBS's The Doctors Dilemma 1906 with the same sense. Yule GU (1926) Why do we sometimes get nonsense-correlations between time-series? J

Re: Kappa negative, doubt?

2001-09-02 Thread David Duffy
Ivan Balducci <[EMAIL PROTECTED]> wrote: > I would like to understand the meaning of negative Cohens Kappa value > (1960). I got it from the following data (from Dental Radiology): > Magnetic resonance versus Facial Pain > Yes No > Yes 1 4 > No 11 30 > Kappa = -