# Tagged Questions

80 views

### Analysis of longitudinal data with very few points

I'm trying to analyse some data I've recently gotten my hands on, but I'm not entirely sure which model to use. One suggestion has been a Mixed Model, Repeated Measurements ANOVA, but I'm not sure if ...
67 views

### Visualizing longitudinal data with binary outcome

For longitudinal data with a numeric outcome, I can use spaghetti plots to visualize the data. For example something like this (taken from the UCLA Stats site): ...
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### Sample size for one sample repeated measures

I am conducting a study in which I want to follow a group of subjects over time. My outcome of interest is continuous and I will measure it at 4 time points. I am trying to calculate the sample size ...
142 views

### Finding correlations in longitudinal data analysis

We are doing research on video lecture watching. We offer a course which lasts four 5 weeks, and there are 9 or 10 videos in each week. We organize group-watching activities. A group usually is ...
217 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 ...
288 views

### Plotting and presenting longitudinal data, options?

Hypothetical Scenario: A few continuous variables, each measured repeatedly at, say 12 time points, each with say, 150 observations. There are small fluctuations from one time point to another (i.e. ...
200 views

### Interpretation of interaction and main effect in a mixed model when one is significant and the other is not

I have repeated (x4) measurements on 90 subjects. The outcome is zero inflated. The model output gives these estimates: ...
992 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 ...
121 views

### Nested repeated measures analysis

I have a nested repeated measures question. I have 20 individuals grouped into 5 families. For each individual I have measurements on subsequent days pre, during, and post-treatment for a total of 6 ...
225 views

### The test procedure of significant differences in count data over time

The data below are from a health testing centre over 8 years so there are different people being tested there each year. All I really want to show is that the amount of females being tested is ...
468 views

### Is there an R package for continuous time longitudinal binary responses?

The bild package appears to be an excellent package for serial binary responses. But it is for discrete time. I would like to specify a smooth function of time ...
222 views

### How to model repeated measures with time-varying covariates in SPSS?

I wanted to test the effectiveness of a particular type of "talking" therapy on depression. I envisaged selecting ONE group of people and measuring their heart rate and scores on depression scale for ...
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### Looking for pointers on how/if to model a “low t and high n” longitudinal data set to evaluate outcome-predictors

Say you have a longitudinal data set with 5 measurement points, which begins at 200-300 participants and declines to about 50. There is an intervention between time-point 2 and 3. There's 3 continuous ...
313 views

### Repeated measures ANOVA

I have to apologise about my lack of experience but hopefully someone can clarify things for me. I am interested in looking at change in psychosocial functioning over time and compare it between ...
318 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 ...
713 views

### Repeated measures structural equation modeling

I need to analyse a dataset of clinical rehabilitation data. I am interested in hypothesis-driven relationships between quantified "input" (amount of therapy) and changes in health status. Although ...
925 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 ...
350 views

### Best model for change in scores over three time points

I have a response variable measured at three time points per individual (week 0, 18, and 36). I am interested in differences in the change of the response over the 36 weeks within some categorical ...