# Questions tagged [repeatability]

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### Confidence interval Standar Error of the Mean

I´m doing a repeatability study with 10 subjects that repeat 4 measures. Calculate Standard Error of the Mean(SEm) = SD(4 measures)/Sq(4), for each subject. Example: 234 226 239 244 Mean= 238 SEm = 2....
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### Mean difference Confidence interval Repeated measures anova

I´m doing 4 repeated measures (T1, T2, T3 and T4) with each subject in the same conditions to calculate repeatability. I have 10 subjects. Could be correct to report posthoc mean differences 95% ...
11 views

### Repeatability for more than 2 measures

I´m trying to calculate repeatability for 4 measures. I see that one of the measures to do this is coefficient of repeatability (CR). The problem is that CR is used in test-retest experiments, for 2 ...
33 views

### Repeatability coefficient and Standard error of Measurement

The repeatability coefficient (CR) (Bland Altman) is used to report repeatability understood as the index that compares measurements with the same subject, the same observer and in a short space of ...
10 views

### Validity, reliability and repeatability

I want to validate an anemometer in a wind tunnel VS gold standard. Thinking in validity, reliability and repeatability. The dependent variable is wind speed. I can test 3 different units of the same ...
22 views

### Identify the distribution of data [closed]

I did one experiment two times with the same subject. I want to find the repeatability of my result. repeatability in a sense is the fraction of behavioural variation that is due to differences ...
1 vote
103 views

### Explanation needed for different ways of calculating precision (ISO-5725 and CLSI EP05-A2)

I'm trying to get along with calculating precision of analytical method. I'm a chemist not a mathematician. ICH M10 guideline requires that: Accuracy and precision should be determined by analysing ...
25 views

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### 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 ...
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### 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 ...
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### 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 ...
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751 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 ...
• 264
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### 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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1 vote
473 views

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

I have a (lme) mixed model of this type: ...
• 125
1 vote
463 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 ...
1 vote
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### 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 ...
1 vote
49 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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### 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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### 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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### 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 ...
973 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 ...
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### 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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### 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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### 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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