# How many ICC raters are there?

## How many ICC raters are there?

In most cases, the form will be 1, however if you want to test whether taking an average of 3 raters’ scores improves reliability, you might use form 2,3,4,etc. ICC(1,1) Each subject is assessed by a different set of randomly selected raters, and the reliability is calculated from a single measurement.

### What is ICC value?

The ICC is a value between 0 and 1, where values below 0.5 indicate poor reliability, between 0.5 and 0.75 moderate reliability, between 0.75 and 0.9 good reliability, and any value above 0.9 indicates excellent reliability [14].

What is ICC MLM?

The ICC is. the proportion of variance in the outcome variable that is explained by the grouping structure of. the hierarchical model. It is calculated as a ratio of group-level error variance over the total error.

How many raters do I need?

Usually there are only 2 raters in interrater reliability (although there can be more). You don’t get higher reliability by adding more raters: Interrarter reliability is usually measure by either Cohen’s κ or a correlation coefficient. You get higher reliability by having either better items or better raters.

## Do I need ICC(1) or ICC(2) in SPSS?

If your answer to Question 1 is yes and your answer to Question 2 is “sample”, you need ICC (2). In SPSS, this is called “Two-Way Random.” Unlike ICC (1), this ICC assumes that the variance of the raters is only adding noise to the estimate of the ratees, and that mean rater error = 0.

### What is intraclass correlation (ICC)?

Intraclass correlation (ICC) is one of the most commonly misused indicators of interrater reliability, but a simple step-by-step process will get it right. In this article, I provide a brief review of reliability theory and interrater reliability, followed by a set of practical guidelines for the calculation of ICC in SPSS.

Is an intraclass correlation a good measure of inter-rater reliability?

An intraclass correlation (ICC) can be a useful estimate of inter-rater reliability on quantitative data because it is highly flexible. A Pearson correlation can be a valid estimator of interrater reliability, but only when you have meaningful pairings between two and only two raters. What if you have more? What if your raters differ by ratee?

What is the output of SPSS reliability analysis procedure?

The output you present is from SPSS Reliability Analysis procedure. Here you had some variables (items) which are raters or judges for you, and 17 subjects or objects which were rated. Your focus was to assess inter-rater aggreeement by means of intraclass correlation coefficient.

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