+ Reply to Thread
Results 1 to 3 of 3

Thread: Discriminant Function Analysis reveals cut off score?

  1. #1
    Points: 150, Level: 2
    Level completed: 50%, Points required for next Level: 50

    Posts
    12
    Thanks
    5
    Thanked 0 Times in 0 Posts

    Discriminant Function Analysis reveals cut off score?




    Hi everyone,

    I have a research project where I am looking at the psychometric properties of a new questionnaire about body image.

    I have two samples: an eating disorder sample and an undergrad control sample.

    I wanted to see how well my questionnaire discriminates between clinical cases and controls. My committee member recommended using a discriminant function analysis (although maybe an ROC curve would have been more appropriate?)

    My committee member said that the discriminant function analysis would help me to figure out my "cutoff score", or the score at which you can classify people into one group or the other.

    However, I'm not sure where in the output/results to find this cutoff score? And I'm a bit too embarassed to ask him. I can't seem to find it anywhere.

    Thanks very much

  2. #2
    Points: 3,006, Level: 33
    Level completed: 71%, Points required for next Level: 44

    Posts
    177
    Thanks
    1
    Thanked 29 Times in 29 Posts

    Re: Discriminant Function Analysis reveals cut off score?

    its the mean of the mean of both groups (if you are using equal sample, otherwise you need to weight the given means).

    so you take the mean of the control group and the mean of your treatment, and then take the average of those two. That gives you your cut-off.

    Good luck.

  3. The Following User Says Thank You to the42up For This Useful Post:

    DefenceDoom (04-11-2016)

  4. #3
    Points: 150, Level: 2
    Level completed: 50%, Points required for next Level: 50

    Posts
    12
    Thanks
    5
    Thanked 0 Times in 0 Posts

    Re: Discriminant Function Analysis reveals cut off score?


    Thanks so much!!!

+ Reply to Thread

           




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