What is an acceptable intraclass correlation coefficient?

What is an acceptable intraclass correlation coefficient?

Under such conditions, we suggest that ICC values less than 0.5 are indicative of poor reliability, values between 0.5 and 0.75 indicate moderate reliability, values between 0.75 and 0.9 indicate good reliability, and values greater than 0.90 indicate excellent reliability.

What does a negative ICC mean?

Negative ICC estimates are possible and can be interpreted as indicating that the true ICC is low, that is, two members chosen randomly from any class vary almost as much as any two randomly chosen members of the whole population.

What does an ICC tell you?

In statistics, the intraclass correlation, or the intraclass correlation coefficient (ICC), is a descriptive statistic that can be used when quantitative measurements are made on units that are organized into groups. It describes how strongly units in the same group resemble each other.

How do you interpret ICC in SPSS?

Run the analysis in SPSS.

1. Analyze>Scale>Reliability Analysis.
2. Select Statistics.
3. Check “Intraclass correlation coefficient”.
4. Make choices as you decided above.
5. Click Continue.
6. Click OK.
7. Interpret output.

What is icc1 and icc2?

In general, ICC(1) is an estimate of effect size indicating the extent to which individual ratings are attributable to group membership, whereas ICC(2) estimates the reliability of mean ratings furnished by a group of judges.

How do I report an ICC?

A: Yes, any individual, group or organisation can send information on alleged crimes to the Office of the Prosecutor (OTP) of the ICC. These are referred to as “communications.” They can be sent by post, by fax or by e-mail to [email protected].

What does an ICC of zero mean?

Like most correlation coefficients, the ICC ranges from 0 to 1. A high Intraclass Correlation Coefficient (ICC) close to 1 indicates high similarity between values from the same group. A low ICC close to zero means that values from the same group are not similar.

How is ICC calculated in Anova?

Very generally speaking, the ICC is calculated as a ratio ICC = (variance of interest) / (total variance) = (variance of interest) / (variance of interest + unwanted variance). It may be noted that this theory is based on the analysis of variance (ANOVA), assuming normal (Gaussian) distributions.

What does ICC mean statistics?

Intraclass correlation coefficients
Intraclass correlation coefficients (ICC) are recommended for the assessment of the reliability of measurement scales. However, the ICC is subject to a variety of statistical assumptions such as normality and stable variance, which are rarely considered in health applications.

How do you calculate ICC from variance?

Calculation. The ICC is calculated by dividing the random effect variance, σ2i, by the total variance, i.e. the sum of the random effect variance and the residual variance, σ2ε.

What is a high ICC?

A high Intraclass Correlation Coefficient (ICC) close to 1 indicates high similarity between values from the same group. A low ICC close to zero means that values from the same group are not similar.

Is Cronbach’s alpha the same as ICC?

Cronbach’s alpha is written as an ICC formula, using the well-known property that taking the average value of a number of ratings increases the reliability of a measurement. We illustrate with an example that the ICC formulas for average measurements of multiple raters and the SB formula give similar results.

What does low intraclass correlation mean?

A dot plot showing a dataset with low intraclass correlation. There is no tendency for values from the same group to be similar. In statistics, the intraclass correlation, or the intraclass correlation coefficient (ICC), is a descriptive statistic that can be used when quantitative measurements are made on units that are organized into groups.

What is intraclass correlation coefficient r?

Intraclass Correlation Coefficient in R. The Intraclass Correlation Coefficient (ICC) can be used to measure the strength of inter-rater agreement in the situation where the rating scale is continuous or ordinal. It is suitable for studies with two or more raters.

Can intraclass correlation (ICC) be negative?

For small or 0 underlying values in the population, the ICC calculated from a sample may be negative. Beginning with Ronald Fisher, the intraclass correlation has been regarded within the framework of analysis of variance (ANOVA), and more recently in the framework of random effects models. A number of ICC estimators have been proposed.

Is the intraclass correlation coefficient a good measure of inter-observer variability?

Since the intraclass correlation coefficient gives a composite of intra-observer and inter-observer variability, its results are sometimes considered difficult to interpret when the observers are not exchangeable.