# Tagged Questions

50 views

### Choosing test for longitudinal, repeated measures and clustered data

I'm a researcher within cardiovascular medicine, currently working on a study in endocrinology (diabetes). I have the following challenge, which I have discussed with several statisticians who all ...
52 views

### How to do mixed logistic regression with multiple repeated measures in R?

I have data from a psychology experiment in which participants were assigned to one of 3 training conditions and then gave responses for 16 trials for each combination of two within-subjects factors, ...
80 views

### Help with repeated measures regression (in R)

I have some small datasets (example data given below) where I am interested in describing relationships between $Y_1$ and $Y_2$ across a gradient $X$ at two time points (date = "early" & "late"). ...
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### GEE: Pairwise comparisons at different levels of a covariate?

I'm familiar with basic regression methods, but have no experience using GEEs. I use SPSS, and I'm trying to use a GEE for a dataset that I have, because there is a repeated measures component in my ...
214 views

### Moderation in repeated-measures design?

Context: Both dependent $(Y_1,~Y_2,~Y_3)$ and independent $(X_1,~X_2,~X_3)$ variables were measured repeatedly at three time points, $\text{Time}_1$, $\text{Time}_2$, and $\text{Time}_3$. Moderator ...
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### Repeated measures data

Suppose you have data where you measure a subject at 10 different time points but some subjects are measured at less than 10 time points. Can you still apply standard methods to model observations at ...
960 views

### Multiple regression with repeatedly measured independent variables?

Design and hypothesis: we measured wellbeing at Time-1 and Time-2, we want to see whether factor A (measured at Time-1 and ...
118 views

### Modeling measurement error (reliability?) using repeated measurements

I have a measurement protocol that seeks to characterise the visual sensitivity of a subject. I would like to assess how reliable the measurements from this procedure are. I have measured a small ...
321 views

### Conversion between units of measurement

I have two different measuring instruments, A and B, both measure the same physical quantity but with different unit of measures: $u_A$ and $u_B$. A is a reference instrument. I measured a reference ...
167 views

### Reference for dummy variable regression for repeated measurements

I want to analyze some repeated measures data using a dummy variable for each measurement unit. This is one approach to deal with the fact that the data is not i.i.D. when repeated-measurements are ...
374 views

### Logistic regression with repeated measures?

I would like to make a prediction for a (new) subject to have a certain outcome given the historical data and the model: ...
156 views

### Comparing means - 2 repeated measures variables, controlling for covariate with heterogeneous slope

I have a 2 level repeated measures DV of accuracy, and a covariate of response bias. As response bias increases, accuracy level 1 increases while level 2 decreases. I want to see if there is a ...
2k views

### Linear regression with repeated measures in R

I was unable to figure out how to perform linear regression in R in for a repeated measure design. In a previous question (still unanswered) it was suggested to me to not use ...
1k views

### Comparing means between two groups over three time points

I have two groups of ten observations each, where the weight are measured at three different points in time. LetÂ´s say baseline, 2 months and 5 months after baseline. Now I would like to draw a ...
314 views

### repeated measures regression

I was hoping that I could get some feedback in terms of keywords I should searching for, or concepts I need to consider with the following: I have non-experimental data that I would like to model in ...
146 views

### Which statistical method should be used in the study of stability of an enzyme?

I did a study monitoring the stability of an enzyme exposed to different conditions over time. Each day for 30 days, an aliquot was taken from each storage sample and analyzed in duplicate. I wanted ...
593 views

### How to specify Bayesian mixed effects model in BUGS

I posted this earlier in the week then retracted the question when I found a good source, not wanting to waste people's time. I haven't made much progress I'm afraid. In trying to be a good citizen ...
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### What type of regression analysis is best to model the relationship between self-efficacy and activity level over three time points?

I am conducting an orthopedic study to predict improvements in activity level (dependent variable) based on a type of self-efficacy scale (the independent variable). There are, however, other ...
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### How to analyse a study where measures are taken repeatedly from right and left legs in five walking conditions?

There are 13 subjects in this study, each subject was "repeatedly measured" right and left legs on five walking conditions. The variables of this data set is: ID, Y, Leg, Conditions. The research ...
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### Is it valid to include a baseline measure as control variable when testing the effect of an independent variable on change scores?

I am attempting to run an OLS regression: DV: Change in weight over a year (initial weight - end weight) IV: Whether or not you exercise. However, it seems reasonable that heavier people will lose ...
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### How to test the effect of condition on change scores for a possibly ordinal dependent variable?

I have a categorical independent variable (two levels: condition 1; condition 2) and ordinal(?) dependent variables (numerical magnitude shifts (e.g. -3 if there was a decrease in number magnitude ...
133 views

### Is it allowed to incorporate static covariates in Mixed effects models with time series data?

I was recently told that it is not allowed to include static covariates in mixed effect models. I can believe that this could be true, however, when I have time series data, and season is a grouping ...
919 views

### Longitudinal data: time series, repeated measures, or something else?

In plain English: I have a multiple regression or ANOVA model but the response variable for each individual is a curvilinear function of time. How can I tell which of the right-hand-side variables ...