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

Thread: Logistic regression diagnostic questions

  1. #16
    Fortran must die
    Points: 58,790, Level: 100
    Level completed: 0%, Points required for next Level: 0
    noetsi's Avatar
    Posts
    6,532
    Thanks
    692
    Thanked 915 Times in 874 Posts

    Re: Logistic regression diagnostic questions




    What software is that function created in (don't think I have seen that form).

    I need to know which variables are non-linear which from your comments I don't think you can tell from that.

    Amusingly since my variables are commonly binary in nature I don't have to run many of them.
    "Very few theories have been abandoned because they were found to be invalid on the basis of empirical evidence...." Spanos, 1995

  2. #17
    Devorador de queso
    Points: 95,754, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Awards:
    Posting AwardCommunity AwardDiscussion EnderFrequent Poster
    Dason's Avatar
    Location
    Tampa, FL
    Posts
    12,932
    Thanks
    307
    Thanked 2,629 Times in 2,245 Posts

    Re: Logistic regression diagnostic questions

    @JesperHP - You need to start math tags without the backslash so you want [math] Math here [/math]
    I don't have emotions and sometimes that makes me very sad.

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

    JesperHP (03-20-2013)

  4. #18
    Omega Contributor
    Points: 38,334, Level: 100
    Level completed: 0%, Points required for next Level: 0
    hlsmith's Avatar
    Location
    Not Ames, IA
    Posts
    6,998
    Thanks
    398
    Thanked 1,185 Times in 1,146 Posts

    Re: Logistic regression diagnostic questions

    Noetsi that sas link was great. I feel like an idiot at times, can someone explain the purpose of finding the non - linearity and what it actually is?

    Again, noetsi I appreciate your posts in that you seem to ask many of the questions that I have and usually beat them to death until you better understand them. Unfortunately I have difficulties becoming so unfettered and end up wallowing in my own ignorance. That and you are one of the sas folks around here.
    Stop cowardice, ban guns!

  5. #19
    TS Contributor
    Points: 7,081, Level: 55
    Level completed: 66%, Points required for next Level: 69

    Location
    Copenhagen , Denmark
    Posts
    515
    Thanks
    71
    Thanked 123 Times in 116 Posts

    Re: Logistic regression diagnostic questions

    Quote Originally Posted by Dason View Post
    @JesperHP - You need to start math tags without the backslash so you want [math] Math here [/math]
    thx I forgot how it was done ... tried editing turning slashes the other way didn't work either so I gave up .... figured you would tell me

  6. #20
    Fortran must die
    Points: 58,790, Level: 100
    Level completed: 0%, Points required for next Level: 0
    noetsi's Avatar
    Posts
    6,532
    Thanks
    692
    Thanked 915 Times in 874 Posts

    Re: Logistic regression diagnostic questions


    Quote Originally Posted by hlsmith View Post
    Noetsi that sas link was great. I feel like an idiot at times, can someone explain the purpose of finding the non - linearity and what it actually is?

    Again, noetsi I appreciate your posts in that you seem to ask many of the questions that I have and usually beat them to death until you better understand them. Unfortunately I have difficulties becoming so unfettered and end up wallowing in my own ignorance. That and you are one of the sas folks around here.
    I feel like an idiot all the time in stats

    Linearity between the logit and the IV (well the continuous IV) is an assumption of logistic regression. If you can assume linearity then the slope of the IV is true generally at all levels of the IV - that is it does not change. If this is not the case the relationship of the IV to the DV (that is the slope) will be different at different levels of the IV. Note there is a difference between the parameters being linear and the X for that parameter being linear but that is a conversation best left to others. The parameters (slopes) being non-linear is far harder to address.

    I beat things to death because I have serious doubts how well I understand much of this and am very afraid of making a mistake. I do this for work and if I make a mistake it could have serious consequence (well if anyone pays attention to what I do).
    "Very few theories have been abandoned because they were found to be invalid on the basis of empirical evidence...." Spanos, 1995

+ Reply to Thread
Page 2 of 2 FirstFirst 1 2

           




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