extrapolate_rate function

Get extrapolation rate.

extrapolate_rate computes the extrapolation rate given the test signal (maxed out), the true complete signal (no maxed out) and the extrapolated signal.

extrapolate_rate(test_df, true_df, extrap_df)

Arguments

• test_df: dataframe. See details for the input format.
• true_df: dataframe. See details for the input format.
• extrap_df: dataframe. See details for the input format.

Returns

number. The extrapolation rate value in double format. If extrapolation rate is 1, it means the extrapolated signal recovers as the true signal. If extrapolation rate is between 0 and 1, it means the extrapolation helps reducing the errors caused by signal maxing out. If extrapolation rate is smaller than 0, it means the extrapolation increases the errors caused by signal maxing out (during over extrapolation).

Details

All three input dataframes will have the same format, with the first column being timestamps in POSXlct format, and the following columns being acceleration values in g.

How is it used in MIMS-unit algorithm?

This function is used to compute extrapolation rate during extrapolation parameter optimization. You may see results in Figure 2 of the manuscript.

Examples

# Prepare data for test, ground truth
  test_df = conceptual_diagram_data[
                conceptual_diagram_data['GRANGE'] == 4,
                c("HEADER_TIME_STAMP", "X")]
  true_df = conceptual_diagram_data[
                conceptual_diagram_data['GRANGE'] == 8,
                c("HEADER_TIME_STAMP", "X")]

  # Do extrapolation
  extrap_df = extrapolate(test_df, range=c(-4, 4))

  # Compute extrapolation rate
  extrapolate_rate(test_df, true_df, extrap_df)

See Also

Other extrapolation related functions: extrapolate()