A longitudinal study comparing a new drug with a standard drug for treatment of 340 subjects suffering mental depression (Koch et al., 1977, Agresti, 2013). The patients are classified according to the severity of the initial diagnosis (mild and severe), the treatment type they received (standard and new drugs) and the responses on the depression assessment (normal and abnormal) at three occasions: after one week (R1), two (R2), and four weeks (R3) of treatment.
data(depression)A data frame whose columns contain:
R3A factor with levels: N as normal, A as abnormal
R2A factor with levels: N as normal, A as abnormal
R1A factor with levels: N as normal, A as abnormal
TreatmentA factor with levels: standard, new drug
DiagnosisA factor with levels: mild, severe
FreqA numeric vector of frequencies
Agresti A (2013) Categorical Data Analysis (third edition). Wiley.
Koch GG, Landis JR, Freeman JL, Freeman DH and Lehnen RG (1977) A general metodology for the analysis of experiments with repeated measurement of categorical data. Biometrics, 38, 563-595.
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data(depression)
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