Have a look in Statistical Methods for Psychologists by David C. Howell for the arcsine transformation.
Graham ************************************************* Dr Graham D. Smith Psychology Division Park Campus University College Northampton Boughton Green Rd. Northampton NN2 7AL Tel: +44 (0) 1604 735500 Ext 2393 E-mail: [EMAIL PROTECTED] ************************************************* ----- Original Message ----- From: Tobias Richter <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, October 17, 2001 1:50 PM Subject: Transformation function for proportions > > > We have collected variables that represent proportions (i. e., the > proportion of sentences in a number of texts that belong to a certain > category). The distributions of these variables are highly skewed (the > proportions for most of the texts are zero or rather low). So my > question is: Is there a function that transforms the proportions into > symmetrically distributed variables? And is there a reliable statistics > text that discusses such transformations? > > Thank you very much, > > Tobias Richter > > > > -- > ------------------------------------------------------------- > Tobias Richter, Psychological Dpt. (General Psychology) > University of Cologne (Germany) > Phone +49-(0)221-470 38 48 E-Mail [EMAIL PROTECTED] > http://www.allg-psych.uni-koeln.de/richter/trichter.htm > > > ================================================================= > Instructions for joining and leaving this list and remarks about > the problem of INAPPROPRIATE MESSAGES are available at > http://jse.stat.ncsu.edu/ > ================================================================= ================================================================= Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =================================================================
