| j_index {iglu} | R Documentation |
Calculate J-index
Description
The function j_index produces J-Index values a tibble object.
Usage
j_index(data)
Arguments
data |
DataFrame object with column names "id", "time", and "gl", or numeric vector of glucose values. |
Details
A tibble object with 1 row for each subject, a column for subject id and a column for J-Index values is returned. NA glucose values are omitted from the calculation of the J-Index.
J-Index score is calculated by .001 * [mean(G) + sd(G)]^2
where G is the list of Glucose Measurements.
Value
If a data.frame object is passed, then a tibble object with two columns: subject id and corresponding J-Index value is returned. If a vector of glucose values is passed, then a tibble object with just the J-Index value is returned. as.numeric() can be wrapped around the latter to output just a numeric value.
References
Wojcicki (1995) "J"-index. A new proposition of the assessment of current glucose control in diabetic patients Hormone and Metabolic Research 27 .41-42, doi:10.1055/s-2007-979906.
Examples
data(example_data_1_subject)
j_index(example_data_1_subject)
data(example_data_5_subject)
j_index(example_data_5_subject)