# SCRC Data Capture and Analysis Software - Tutorial 14

## Cross-correlation Analysis of Filtered and Rectified Waveforms

Uses the sample data set apjedro4damp02.
Uses the shell scripts getwfdata and crosscorr, from our analysis script archive.

- Cross-correlation Analysis of Filtered and Rectified Waveforms 59k PDF
- Cross-correlation Analysis of Filtered and Rectified Waveforms 83k Word

Topics:

> Purpose: to provide a correlation between two time series (2 WFs).
> Outcome: Pearson's Product Moment correlation coefficient (r) shows positive, zero or negative correlation. Cross-correlation repeats this test at a number of "lags", shifting one series progressively left or right of the other, to show stability of phase relationships.
> Procedure: Rectify and filter ENGs, select data range, downsample data, cross-correlate and plot.
> Examples: Combining two cross-correlations on the same graph, creating a cross-correlation histogram figure using Excel.

See also: SCRC Software On-line Documentation

| © Copyright 2006 Spinal Cord Research Centre, University of Manitoba. All Rights Reserved. | Revised January 11, 2006. |