j_index: Calculate J-index

In stevebroll/iglu: Interpreting Glucose Data from Continuous Glucose Monitors

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(BG) + sd(BG)]^2 where BG is the list of Blood 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)

stevebroll/iglu documentation built on Jan. 30, 2021, 1:53 a.m.