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Date:   Tue, 11 Apr 2000 09:11:55 -0700
Reply-To:   Ed Sloat <ESloat@PEORIAUD.K12.AZ.US>
Sender:   "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:   Ed Sloat <ESloat@PEORIAUD.K12.AZ.US>
Subject:   Re: point-biserial
Comments:   To: abdalla alsmadi <alsmadi@MUTAH.EDU.JO>
Content-Type:   text/plain; charset="iso-8859-1"

Since all of the items in your data set are dichotomous (0,1), and the total score is the sum of these dichotomous items (having a characteristic of a continuous variable - provided the number of items is large), the SPSS procedure for the standard Pearson correlation of each item to the total score will be a point-biserial. This is very common in testing as an a measure (or index) of item discrimination.

************************************************************************ ********************************* Ed Sloat, Director PUSD Web Site: www.peoriaud.k12.az.us Office of Research and Planning Research Web Site: research.peoriaud.k12.az.us Peoria Unified School District 6330 West Thunderbird Road Glendale, Arizona 85306 Phone: (623)486-6077 Fax: (623)486-6111 Pager: (602)498-9031

-----Original Message----- From: abdalla alsmadi [mailto:alsmadi@MUTAH.EDU.JO] Sent: Tuesday, April 11, 2000 1:24 PM To: SPSSX-L@LISTSERV.UGA.EDU Subject: point-biserial

Hi evrybody I have 75 binary items(0,1), and a Total score. I need to compute the point biserial for each item, I couldn't figure it out, is it because I have the student version of spss???? can you help? Thanks Abdalla Alsmadi,Ph.D Dep.of Psychology, College of Educational Sciences p.o.Box 7 M'utah University - Karak - JORDAN


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