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Assessing Repeatability: Random and Systematic Error

I am analyzing a study where my goal is to assess the quality (precision) of several machines. I have just one true value (measured with the goldstandard) and made 30 runs for every single machine. ...
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1answer
21 views

Repeatability estimation using a mixed model with repeated measures by four raters

I am a medical doctor and definitely not an expert in statistics, although I think I do okay and I am familiar with R. I have discussed the following issue with a statistician but I am still not sure ...
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22 views

Intra-rater reliability for categorical (non-binary) data with variable observations

Here's what my data look like: From a mark-recapture study on a population of birds, I have data on the coloration score for each individual bird. The coloration score is a simple visual score that ...
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68 views

Interpreting summary of ICC results in R package “psych”

I have a dataframe "all.st.icc", where 27 subjects have measures of social behavior for each of 8 different years. First four rows of data are as follows: ...
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1answer
124 views

Computing repeatability from overdispersed zero-inflated negative binomial GLMMM in R

I'm trying to compute repeatability of a count response variable from a Generalized linear mixed model with multiple fixed effects and individual ID as a random effect. I'm dealing with both ...
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34 views

What measurements or tests should I take for testing stability of patterns?

I have a dataset containing behaviours of users. Let's say we have 1000 users and 40 similar tasks. The tasks are similar but the difficulty level vary.To do a task, people can follow 10 patterns. ...
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63 views

What is a “subject” in ICC?

I have been working in R and have finally got some code working regarding intraclass correlation coefficients. In the output I get something called "subjects". I thought it was to do with the number ...
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1answer
1k views

How to compare repeatability (ICC) of different groups?

I have calculated the ICC values for two groups and would now like to compare the ICC values to determine if the groups differ in their repeatability. In the literature people have simply used t-tests ...
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122 views

Determine individual consistency from mixed model?

To investigate the difference between three tasks I tested 30 individuals on each of the three tasks and ran the linear model as follows: ...
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450 views

How to analyze intra-rater reliability with 31 raters who all rated 4 subjects twice

I'm trying to analyze the intra-rater reliability of an occupational therapy assessment. The assessment consists of 57 items, where some items are ratio data and some items are ordinal data. In my ...
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5answers
493 views

How to assess repeatability of multivariate and method-specific outcomes?

Method "A" describes biological samples using multivariate "fingerprints" that consist of about 30 different variables. Different variables show different typical distribution and many of them closely ...
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1answer
479 views

The use of xtmixed with the quickicc command

I am attempting to do a icc using the quickicc command following the use of xtmixed. I'm attempting to check repeatability in a ...
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2answers
127 views

How to assess whether experimental measurements obtained from different technicians are biased?

Suppose I have a list of measurements from an experiment; for example, 34 31 55 18 19 22 44 48 23 . . . But I then learn that these experiments were conducted by two different technicians, so I ...
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2k views

Computing repeatability of effects from an lmer model

I just came across this paper, which describes how to compute the repeatability (a.k.a. reliability, a.k.a. intraclass correlation) of a measurement via mixed effects modelling. The R code would be: ...
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492 views

Confidence intervals for repeatability

I have calculated the repeatability of individuals' responses to a stimulus using the methodology of Lessells & Boag (1987) Auk 104:116, where repeatability r = among-groups variance component / ...