A variable that records something about a study unit in a longitudinal study that changes over the course of the study.
Questions tagged [time-varying-covariate]
358 questions
4
votes
1 answer
How do I model the variation over time?
The data: Each year, during the months from January to July, a select number of plants had a certain "thing" measured. Each month, this was done almost every day for some plants, and maybe weekly or so, for other plants. This was done for 5 years,…
Bono
- 41
2
votes
1 answer
In longitudinal data, what can be gained from modelling "time" as a covariate?
Imagine some data set where subjects $1, ..., K$ had a response $Y$ measured repeatedly over a period of time (say, 2000-2015).
Now, in order to study effects like "does the month of the measurement matter?", or "is there a trend over the years?",…
Jaood
- 141
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vote
0 answers
Repeated measures analysis and autocorrelation
Imagine 10 people.
In year 2016, the first 5 people have a response $Y$ measured on days randomly allocated throughout the months of January to July. The days were random for each individual.
In year 2017, the other 5 people were again measured on…
Dani
- 11
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Interpretation of Cox time-varying covariate
I have fitted the Cox model with time-varying covariates and the results are here
where gdp_time is time-varying covariate.
and here are the values for gdp_time time1 = 0, time2 = 1, time3 = 0.
When I calculate the result with
h(t|Z) =…
