# Import data Study10.csv from https://osf.io/v9px7/Test-retest Reliability
Important
Before submission, please set eval: true in YAML.
You will use data from this paper: https://www.sciencedirect.com/science/article/pii/S1053811921011150, which contains person-level fMRI data from 120 participants with chronic back pain. The participants received pressure pain stimulation accross two time points.
Q1: Download the data and show a descriptive table of the rating (subjective pain ratings) and nps (Neurological Pain Signature) variables.
Q2: What construct does the nps variable measure?
Q3: Show the summary statistics of the rating and nps variables across the two time points.
Q4: Does it appear that nps across two time points are parallel measurement?
Q5: Show a scatterplot of the nps variables across the two time points (sessions).
# Include your codeQ6: What is the test-retest reliability of the rating and nps variables across the two time points? Use the psych::cor.ci() function to also obtain the confidence interval.
# Insert your R codeQ7: Using the Spearman-Brown formula, what is the estimated reliability if one obtain the mean of nps across three time points?