Inter- and intra-subject reliability

Posted by tbing on Apr 14, 2014; 12:51pm
URL: http://spssx-discussion.165.s1.nabble.com/Inter-and-intra-subject-reliability-tp5725425.html

Hi, I would like to measure the inter- and intra-subject reliability of 9 subjects in preparing three different thicknesses of liquids (i.e. mild, moderate & extreme). Subjects were asked to prepare each sample 3 times (i.e mildly-thick x 3, moderately-thick x 3, and extremely-thick x 3). Here's the data I get:


Previous study used replication reliability analysis (see attachment) but I can't find any info about it.
Variability_among_speech-language_pathologists.pdf

Inter-subject reliability: Variability between the subjects in preparing the liquids
Intra-subject reliability: Variability within the subject in preparing the liquids

My questions are:
1. How can I measure the inter- and intra-subject reliability using SPSS?
2. Is it correct to use intraclass correlation (ICC) to measure inter-subject reliability? If so, how to key in the data in SPSS?

Thank you.

Bing