Data from studies or processes with multiple observations over time. Econometrics is a typical topic where such data would be collected and analyzed. Proper analysis will take into account auto-correlation and cross-correlation.
Questions tagged [longitudinal]
262 questions
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2 answers
Assistance with reshaping intensive longitudinal data in R
Apologies if I'm not posting correctly. I'm new to R and this is my first post to stackoverflow. I've read as much as can to find a solution to my problem, but haven't been able to find something I can use.
I have some intensive longitudinal data…
Dullsey
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1 answer
Median number of observations per person
I have a data frame in long format showing repeated measures of height on a group of individuals.
The mean number of observation is calculated 2000/500 = 4 observations per child.
How can I calculate the median and interquartile range for the number…
aelhak
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2 answers
Collapsing Rows in Longitudinal Dataset
I have a data set where I had multiple rows all corresponding to baseline measures. I want to collapse these rows by record id so that each individual only has one row for baseline measures. This means I have to collapse across all variables, some…
Michael
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1 answer
first and last ID syntax in spss
My previous organisation used SAS, but my current one uses SPSS.
I have longitudinal dataset to analyse.
What is the SPSS equivalent syntax for first.ID and last.ID? In SAS, the syntax goes,'if first.ID and last.ID then do....;'
I apologised if…
Meill
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2 answers
How can I calculate the difference between two last values in R?
My data roughly appears like the following and I want to calculate a variable for each participant (v001) with the difference between the last two available measurements (from lnslope1 to lnslope9). Every subject has at least two measurements.
My…
guaguncher
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2 answers
How to match data from six data files in wide format in SPSS
I'm currently preparing some longitudinal data for analysis in SPSS and I've got six data files. How do I combine them into the wide format for analysis?
Wendeekay
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Convert 4 Hex byte GPS data to degrees latitude and longitude c#
I have my Longitude in Hex FF676980(4 bytes), I want to convert it into degrees in c#, how can I do it?
Roshan
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