# Tagged Questions

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19 views

### Determining the Repeatability and Reproducibility (Gage R&R) in Minitab within a General Linear Model

I am doing some rather complex data analysis and I was wondering if it was possible to determine the reproducibility and repeatability of a measurement system within a GLM in Minitab. In this data, ...
25 views

### Random effects for multiple social partners

I am a behavioral scientist attempting to estimate the degree to which animal subjects in my dataset exhibit consistent individual differences ('personality') in their social behavior. The dataset ...
8 views

### Increasing sensor resolution by repeat measurement

I have a thermometer which has resolution of 1C. The temperature is measured, the thermometer is reset, and the temperature is measured again. I'm looking for a formula to calculate how many ...
86 views

### Completely different results after each cross validation

I'm running some classification algorithms in MATLAB and validating them with a 10-fold cross validation. The problem is that every time I execute the cross validation, it gives a very different ...
31 views

### Warning message after a MCMCglmm call in R

I have a Warning message after a MCMCglmm call in R. Let me first write about the aims of the study : 1) describe whether a set of seven different behavioural traits vary (or are consistent) in time ...
27 views

### Is it appropriate to transform a dependent variable twice?

Is it appropriate to transform a dependent variable twice, say a lnY and then cubing the ln. The final transformation will be [ln(Y)]^3. I know how to back-transform the results with only the log ...
83 views

### Statistical significance, repeatability, and sample size (50 shades of grey)

Reading about the problems with significance I wondered how one would approach an experiment in the right way, considering that in practice the sample size cannot be arbitrarily large. While some ...
61 views

### Assessing Repeatability of a Multivariate Measurement

I have a measurement that was taken 10 times on a sample. The measurement has roughly 11K points. If you're curious, I'm looking at mass spectrum data. I want to determine the repeatability of the ...
171 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 ...
60 views

### Confidence interval for Repeatability from a lme mixed model

I have a (lme) mixed model of this type: ...
51 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 ...
274 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: ...
252 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 ...
37 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. ...
72 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 ...
2k 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 ...
165 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: ...
659 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 ...
541 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 ...
545 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 ...
136 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 ...