+ Reply to Thread
Page 2 of 2 FirstFirst 1 2
Results 16 to 20 of 20

Thread: Polychoric Principal Component Analysis

  1. #16
    Points: 38, Level: 1
    Level completed: 76%, Points required for next Level: 12

    Posts
    7
    Thanks
    1
    Thanked 0 Times in 0 Posts

    Re: Polychoric Principal Component Analysis




    Quote Originally Posted by spunky View Post
    what about calculating a factor/principal component score on the PC that represents "wealth"? i'm assuming "wealth" is a latent variable here where you're using items as proxies, so certain proxies would be more correlated with this PC that stands for "wealth"? if you get a PC score, you would get a measure of this "wealth" per individual.
    Yes, I just wanted to retain the first principal component as an indicator of wealth, so I could work with this PC as a measure of "wealth" per individual as you said.
    But when I used the principal function I got PC1 for each of my "items" (variables).

    http://imgur.com/gcqREq8

    How do I get a PC for every individual?

  2. #17
    Points: 38, Level: 1
    Level completed: 76%, Points required for next Level: 12

    Posts
    7
    Thanks
    1
    Thanked 0 Times in 0 Posts

    Re: Polychoric Principal Component Analysis

    Yes, I want to get a PC of "wealth" per individual, but when I use the principal function I get a PC score for every variable and not for every individual/observation. Is there a way to do that?

    http://s17.postimg.org/51ygmy233/Scr...7_47_22_PM.png

  3. #18
    TS Contributor
    Points: 22,359, Level: 93
    Level completed: 1%, Points required for next Level: 991
    spunky's Avatar
    Location
    vancouver, canada
    Posts
    2,135
    Thanks
    166
    Thanked 537 Times in 431 Posts

    Re: Polychoric Principal Component Analysis

    what about the option that i mentioned to you regarding calculating principal component scores from the principal component that implies the latent variable 'wealth'?

    that way you would obtain a reading of 'wealth' for each participant.

    other than that, i cannot see any other possibility to get information of 'wealth' per individual. if the scores don't work for you i don't think principal component is then the technique you should be using to get the information you want.
    for all your psychometric needs! https://psychometroscar.wordpress.com/about/

  4. #19
    Points: 38, Level: 1
    Level completed: 76%, Points required for next Level: 12

    Posts
    7
    Thanks
    1
    Thanked 0 Times in 0 Posts

    Re: Polychoric Principal Component Analysis

    Yes I want to do that, but I don't know how to do it. I know this isn't a space for R questions, but the only result I get is the one (the picture) I uploaded in the post above.

    This are the only functions I am using:

    ses <- read.table("SES_matrix_edit.txt", fill = T)
    Poly_cor <- polychoric(ses)$rho
    principal(Poly_cor, nfactors = 1)

    Thank you again.

  5. #20
    TS Contributor
    Points: 22,359, Level: 93
    Level completed: 1%, Points required for next Level: 991
    spunky's Avatar
    Location
    vancouver, canada
    Posts
    2,135
    Thanks
    166
    Thanked 537 Times in 431 Posts

    Re: Polychoric Principal Component Analysis


    Quote Originally Posted by JavierM88 View Post
    but I don't know how to do it.
    i think all the info you need about principal component scores can be found here
    for all your psychometric needs! https://psychometroscar.wordpress.com/about/

+ Reply to Thread
Page 2 of 2 FirstFirst 1 2

           




Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts






Advertise on Talk Stats