iglu (version 4.2.2)

j_index: Calculate J-index

Description

The function j_index produces J-Index values a tibble object.

Usage

j_index(data)

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.

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.

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, tools:::Rd_expr_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)