| represent.long {DTComPair} | R Documentation |
Long Representation of Results from Two Binary Diagnostic Tests
Description
Long representation of results from two binary diagnostic tests.
Usage
represent.long(d, y1, y2)
Arguments
d |
A numeric vector specifying the gold-standard results (1 = presence of disease, 0 = absence of disease). |
y1 |
A numeric vector specifying the results of diagnostic test 1 (1 = positive, 0 = negative). |
y2 |
An numeric vector specifying the results of diagnostic test 2 (1 = positive, 0 = negative). |
Details
Sometimes a long representation of data from a “paired” study of binary diagnostic tests is required, e.g. to run regression analyses.
In a wide representation each subject has 1 record in the dataset containing d, y1 and y2.
In a long representation each subjects has 2 records in the dataset, one for each test. The data format is shown below.
Value
A dataframe containing:
id |
A numeric vector specifying the patient identifier. |
d |
A numeric vector specifying the gold-standard results (1 = presence of disease, 0 = absence of disease). |
x |
A numeric vector specifying the diagnostic test (1 = test 1, 0 = test 2). |
y |
A numeric vector specifying the test results (1 = positive, 0 = negative). |
See Also
tab.paired and read.tab.paired.
Examples
data(Paired1) # Hypothetical study data
names(Paired1)
new.long <- represent.long(d=Paired1$d, y1=Paired1$y1, y2=Paired1$y2)
str(new.long)
head(new.long)