Artificial data set of 70 subjects with 5 items, 4 time points and 3 groups for LLRA.
Usage
llraDat2
Arguments
encoding
UTF-8
Details
This is a data set as described in Hatzinger and Rusch (2009). 5 items
were measured at 4 time points (in columns). Each persons answers to the
items are recorded in the rows. There are 2
treatment groups and a control group. Treatment group 2 has size, 10,
treatment group 1 has size 20 and the control group has size 40. Item 1 is dichotomous, all others
are polytomous. Item 2, 3, 4 and 5 have 3, 4, 5, 6 categories
respectively.
References
Hatzinger, R. and Rusch, T. (2009) IRT models with relaxed assumptions
in eRm: A manual-like instruction. Psychology Science Quarterly, 51,
pp. 87--120,
http://erm.r-forge.r-project.org/psq_1_2009_06_87-120.pdf