maybe I should get a vote on this one :-)
-----Original Message-----
From: Chelminski, Iwona
Sent: Monday, September 18, 2006 7:55 AM
To: 'Spousta Jan'
Subject: RE: Re: ROC
Hi Jan,
Thank you very much for your reply. I'm not sure what to do b/c some suggest
not to use the overlapping groups of people, and others, including you,
think the best way is to keep all cases...
Thanks again,
Iwona
-----Original Message-----
From: Spousta Jan [mailto:
[hidden email]]
Sent: Monday, September 18, 2006 2:49 AM
To: Chelminski, Iwona;
[hidden email]
Subject: RE: Re: ROC
Hi Iwona,
In my opinion, the best way is to keep all cases and make 3 subsequent
analyses:
* 1 or 2 against 3+
* 1 - 4 against 5+
* 1 - 5 against 6+
Otherwise you'll throw out information without reason.
Greetings
Jan
-----Original Message-----
From: SPSSX(r) Discussion [mailto:
[hidden email]] On Behalf Of
Chelminski, Iwona
Sent: Friday, September 15, 2006 5:02 PM
To:
[hidden email]
Subject: Re: ROC
Hi Folks,
I'm resending this, hoping that someone might give me a suggestion
(please
:-)
Thanks in advance
> -----Original Message-----
> From: Chelminski, Iwona
> Sent: Thursday, September 14, 2006 1:35 PM
> To: SPSS list (E-mail)
> Subject: ROC
>
> Hi group,
> I have two instruments-one (let's call it X) measures a number of
> different symptoms of an illness and the other measure (let's call it
> Y) allows to rate an overall impression of the illness (there are 7
> numbers on the Y that capture 4 levels of the illness: none (1-2),
> mild (3-4), moderate (5), severe (6-7). I want to identify the cut off
> scores on the X total score for adjacent severity levels on the Y by
using ROC analyses.
> Should I include only these cases who scored within those adjacent
> levels, or all cases? For example, for None vs. Mild I'm including
> only those that scored 1 or 2 (=none) or 3 or 4 (=mild) on the Y (i.e,
> excluding those who scored 5, 6, and 7), right?
> Or should I use all cases and split the sample between "1 or 2" (for
> none) and "GE 3" (for the rest)?
> Thanks in advance!!!
> Iwona
>
Locked
