| armd {nlmeU} | R Documentation |
armd Data (867 x 8)
Description
Data from Age-Related Macular Degeneration (ARMD) clinical trial
Format
The armd data frame has 867 rows and 8 columns. It contains
data for n=234 subjects stored in a long format with up to four rows for one
subject.
- 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
Examples
summary(armd)