armd: armd Data (867 x 8)

In nlmeU: Functions and Data Supporting 'Linear Mixed-Effects Models: A Step-by-Step Approach'

armd Data (867 x 8)

Description

Data from Age-Related Macular Degeneration (ARMD) clinical trial

Usage

armd

Format

A data frame with 867 rows and 8 columns:

subject

A factor with 234 levels: 1, 2, 3, 4, 6, ..., 240

treat.f

A factor with 2 levels: Placebo, Active

visual0

An integer vector with values ranging from 20 to 85

miss.pat

A factor with 8 levels: ----, ---X, --X-, --XX, -XX-, ..., X-XX

time.f

A factor with 4 levels: 4wks, 12wks, 24wks, 52wks

time

A numeric vector with values 4, 12, 24, 52

visual

An integer vector with values ranging from 3 to 85

tp

A numeric vector with values 1, 2, 3, 4 corresponding to time points 4, 12, 24, 52, respectively

Details

The ARMD data arise from a randomized multi-center clinical trial comparing an experimental treatment (interferon-alpha) versus placebo for patients diagnosed with ARMD.

Source

Pharmacological Therapy for Macular Degeneration Study Group (1997). Interferon alpha-IIA is ineffective for patients with choroidal neovascularization secondary to age-related macular degeneration. Results of a prospective randomized placebo-controlled clinical trial. Archives of Ophthalmology, 115, 865-872.

See Also

armd0, armd.wide

Examples

library(nlmeU)
data(armd)
summary(armd)

nlmeU documentation built on Aug. 25, 2025, 5:12 p.m.