| grade {iglu} | R Documentation |
Calculate mean GRADE score
Description
The function grade produces GRADE score values in a tibble object.
Usage
grade(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 GRADE values is returned. NA glucose values are omitted from the calculation of the GRADE.
GRADE score is calculated by 1/n * \sum [425 *
(log(log(G_i / 18)) + .16)^2]
Where G_i is the ith Glucose measurement and n is the total
number of measurements.
Value
If a data.frame object is passed, then a tibble object with two columns: subject id and corresponding GRADE value is returned. If a vector of glucose values is passed, then a tibble object with just the GRADE value is returned. as.numeric() can be wrapped around the latter to output just a numeric value.
References
Hill et al. (2007): A method for assessing quality of control from glucose profiles Diabetic Medicine 24 .753-758, doi:10.1111/j.1464-5491.2007.02119.x.
Examples
data(example_data_1_subject)
grade(example_data_1_subject)
data(example_data_5_subject)
grade(example_data_5_subject)