madras {lnMLE}R Documentation

Madras Longitudinal Schizophrenia Study data

Description

Data from a study of the natural history of schizophrenia. First-episode patients had disease symptoms recorded monthly for up to 12 months following initial hospitalization.

Usage

data(madras)

Format

A matrix containing 8 variables (columns) and 922 observations (rows) measured on a total of 86 patients.

id:
a vector that identifies the clusters which correspond to the binary response vector given by y.
y:
the binary response vector for presence or absence of schizophrenic symptoms
month:
symptom measurements were collected over the course of 12 months (0,...,11) following the initial hospitalization for schizophrenia
age:
a binary indicator for age at onset (1 = age < 20 years old)
gender:
0 = male, 1 = female
monthXage:
an interaction term (cross product) of month and age
monthXgender:
an interaction term (cross product) of month and gender
initial:
an indicator variable for month = 1 allowing alpha1 to be used in lag-2 transition models for both the second-order model and the initial state

References

Thara, R., Henrietta, M., Joseph, A., Rajkumar, S., and Eaton, W. (1994). Ten year course of schizophrenia - The Madras Longitudinal Study. Acta Psychiatrica Scandinavica {bf 90}, 329-336.


[Package lnMLE version 1.0-1 Index]