Fwd: What is the best approach for my research?

Posted by Benjamin Spivak (Med) on Feb 23, 2012; 1:13pm
URL: http://spssx-discussion.165.s1.nabble.com/What-is-the-best-approach-for-my-research-tp5507150p5508005.html

Hi Ryan,

Thank you very much, I will look at Rasch models and attempt to apply it to my work. Could I trouble you with another question. 

Say, I do find that there is a uni-dimensional construct underlying comprehension. How could this assist me to look for differences between conditions?

Regards,

Ben

On 23 February 2012 23:41, R B <[hidden email]> wrote:

Benjamin,

The first thing I would consider would be whether there is an underlying unidimensional construct underlying comprehension. You could fit a Rasch model via Winsteps, which allows for items with varying response options.

Ryan

On Thu, Feb 23, 2012 at 1:14 AM, Benjamin Spivak <[hidden email]> wrote:

Dear List,

 

Please help I am stuck. I am performing some jury research with some very strange result and I want to find the ideal statistical model to fit my data.

 

My study. Essentially a 2x3 jury simulation study measuring comprehension of law. I also have over 18 DV's (questions) for comprehension. I have considered condensing the questions into one variable. But Cronbach's alpha is quite low for any combination of questions that I can relate to one construct.

 

Distribution is extremely non-normal and there is a heterogeneity of variance between groups. Also, because the jury study uses deliberating groups I have violated the assumption of independence.

 

Considering all this, I am having real trouble determining what the best approach for analysis would be. I have tried multi-level linear modelling, but I get results that I cannot make sense of.

 

I am at my wits end. If somebody could help, I would be in their debt.

 

Regards,

 

Ben.

 

 

 

 I would like to analyze individual jury data, but clearly my model violates the assumption of independence. So I have to account for this.