iglu (version 3.5.0)

mage_ma_single: Calculates Mean Amplitude of Glycemic Excursions (see "mage")

Description

This function is an internal function used by "mage". The function will calculate the Mean Amplitude of Glycemic Excursions (MAGE) on all the values of the inputted data set. To calculate separate MAGE values for a group of subjects, use the "mage" function.

Usage

mage_ma_single(
  data,
  short_ma = 5,
  long_ma = 32,
  type = c("auto", "plus", "minus"),
  plot = FALSE,
  dt0 = NULL,
  inter_gap = 45,
  tz = "",
  title = NA,
  xlab = NA,
  ylab = NA,
  show_ma = FALSE
)

Value

The numeric MAGE value for the inputted glucose values or a ggplot if plot = TRUE

Arguments

data

DataFrame object with column names "id", "time", and "gl". Should only be data for 1 subject. In case multiple subject ids are detected, the warning is produced and only 1st subject is used.

short_ma

Integer for period length of the short moving average. Must be positive and less than "long_ma", default value is 5. (Recommended <15)

long_ma

Integer for period length for the long moving average, default value is 32. (Recommended >20)

type

One of "plus", "minus", "auto" (Default: auto). Algorithm will either calculate MAGE+ (nadir to peak), MAGE- (peak to nadir), or automatically choose based on the first countable excursion.

plot

Boolean. Returns ggplot if TRUE.

dt0

The time frequency for interpolation in minutes, the default will match the CGM meter's frequency (e.g. 5 min for Dexcom).

inter_gap

The maximum allowable gap (in minutes) for interpolation. The values will not be interpolated between the glucose measurements that are more than inter_gap minutes apart. The default value is 45 min.

tz

A character string specifying the time zone to be used. System-specific (see as.POSIXct), but " " is the current time zone, and "GMT" is UTC (Universal Time, Coordinated). Invalid values are most commonly treated as UTC, on some platforms with a warning.

title

Title for the ggplot. Defaults to "Glucose Trace - Subject [ID]"

xlab

Label for x-axis of ggplot. Defaults to "Time"

ylab

Label for y-axis of ggplot. Defaults to "Glucose Level"

show_ma

Whether to show the moving average lines on the plot or not

Author

Nathaniel Fernandes

Details

See "mage".

Examples

data(example_data_1_subject)
mage_ma_single(
   example_data_1_subject,
   short_ma = 4,
   long_ma = 24,
   type = 'plus')

mage_ma_single(
   example_data_1_subject,
   inter_gap = 300)

mage_ma_single(
   example_data_1_subject,
   plot=TRUE,
   title="Patient X",
   xlab="Time",
   ylab="Glucose Level (mg/dL)",
   show_ma=FALSE)