Thank you for explanation. Bu my question was unclear therefore let me ask again. I invented an exapmle.
I have 10 questions in a questionnaire. These questions are my 10 variables. A consumers fill this questionnaire for each 15 products e.g cars. Because 10 variables (X1, X2, ...,X10) are correlated with each other I use factor analysis and (for convinence I ordered it) I get Factor1: X1,X2,X3,X4,X5,X6,X7 Factor2: X8,X9,X10 I can e.g put X1 into 2-D space, because I know that X1= -1*F1+ (-1*F2). It means that X1 has co-ordinates X1=(-1,-1). It's simple. But I'm not interested in positioning X1. For me it's important where there are products (cars) in 2-D space. Therefore my question is how to do it. I heard (but I do not know) that using e.g variable X1,...X10 mean and factor loadings I can do it i.e. for car1: I multiple factor loadings and variables mean (suitable) and I get this position Could you help me verify this? I would be very appreciate Regards Huxley Uzytkownik "John Uebersax" <[EMAIL PROTECTED]> napisal w wiadomosci [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > A program like SAS or SPSS will calculate factor scores for you. A > factor score is an estimated location of an object (not a variable) > relative to a factor. If your factors are orthogonal, then you can > plot each case using that case's score on Factor 1 and the score on > Factor 2 as the X- and Y- coordinates of in a 2-dimensional space. > > I believe the formula for estimating factor scores of a common-factor > model is not trvial (unless all communalities are 1). Therefore one > might as well let the software calculate factor scores. The topic is > well explained in the SAS manual (PROC FACTOR)--perhaps also in the > SPSS manual. > > -------------------------------------------------------------------------- ------ > John Uebersax, PhD (805) 384-7688 > Thousand Oaks, California (805) 383-1726 (fax) > email: [EMAIL PROTECTED] > > Agreement Stats: http://ourworld.compuserve.com/homepages/jsuebersax/agree.htm > Latent Structure: http://ourworld.compuserve.com/homepages/jsuebersax > Existential Psych: http://members.aol.com/spiritualpsych > Diet & Fitness: http://members.aol.com/WeightControl101 > -------------------------------------------------------------------------- ------ > > "Huxley" <[EMAIL PROTECTED]> wrote in message news:<a2u3sa$q3e$[EMAIL PROTECTED]>... > > Hi, > > I've got a question. Does anyone know how to set object in 2-factor > > dimensional space ... > > I heard that factor score for a product is equal to product of the suitable > > factor loadings and variables mean. i.e. > > f(m,p)=a(1,m)u(1,p) +a(2,m)u(2,p)+ ...+a(j,m)u(j,p) > > where: f(m,d) - factor score for m-factor, p-th - consumer product , u(*) - > > mean for variable j and product p. > > Could you tell me is this true? How to proof this formally ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at http://jse.stat.ncsu.edu/ =================================================================
