[IPAC-List] Question on LXR Software

[Joel Wiesen]

Several people have asked, back-channel, so let me give more detail.

The difference in SPSS and LXR item-total correlations is not due to 
including or not including the item in question from the total score. 
(The SPSS item-total correlations from the Reliability command exclude 
the item from the total.)

The SPSS item-total correlations agree with correlation calculations in 
Excel, to many decimal places.

The correlation between the SPSS item-total correlations and the LXR 
item-total correlations is .998.  However, the mean absolute difference 
between the correlations is .05, which is too large to be due to 
rounding error. The largest differences between the SPSS and LXR 
item-total correlations are more than .10, which is a large difference 
for an individual item.

Has anyone had success in verifying the item-total correlations in LXR 
against some other software package, or by hand?

Thanks.

Joel


- -
Joel P. Wiesen, Ph.D., Director
Applied Personnel Research
62 Candlewood Road
Scarsdale, NY 10583-6040
http://www.linkedin.com/in/joelwiesen
(617) 244-8859
http://appliedpersonnelresearch.com




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On 9/2/13 3:10 PM, Joel Wiesen wrote:

> LXR is giving me item total correlations that I cannot reproduce with

> SPSS or Excel.

>

> Has anyone run into this?

>

> Is there something unusual about the way LXR calculates item total

> correlations?

>

> Thanks.

>

> Joel

>

>

>

>