armd0: armd0 Data (1107 x 8)

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

armd0 Data (1107 x 8)

Description

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

Usage

armd0

Format

A data frame with 1107 rows and 8 columns:

subject

A factor with 240 levels: 1, 2, 3, 4, 5, ...

treat.f

A factor with 2 levels: Placebo, Active

visual0

An integer vector with values from 20 to 85

miss.pat

A factor with 9 levels: ----, ---X, --X-, --XX, -XX-, ...

time.f

A factor with 5 levels: Baseline, 4wks, 12wks, 24wks, 52wks

time

A numeric vector with values from 0 to 52

visual

An integer vector with values from 3 to 85

tp

A numeric vector with values from 0 to 4

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

armd, armd.wide

Examples

data(armd0, package = "nlmeU")
summary(armd0)

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