File Exchange > DataAnalysis >    Detrended Correspondence Analysis

Author:
OriginLab Technical Support
Date Added:
8/24/2020
Last Update:
11/16/2020
Downloads (90 Days):
60
Total Ratings:
0
File Size:
83 KB
Average Rating:
File Name:
dca.opx
File Version:
1.1
Minimum Versions:
License:
Free
Summary:

Perform detrended correspondence analysis.

Screen Shot and Video:
Description:

Purpose

This App can be used to perform detrended correspondence analysis (DCA). It is a multivariate method that corrects for the major problems (the arch effect and compression of the ends of the gradient) of Correspondence Analysis.

Installation

The app requires R software (minimum required version 3.4.1) and package (vegan). If R is not yet installed on your computer, please follow these steps.

  1. Run Origin as administrator. Download the file dca.opx and install it by choosing Tools->Package Manager->Tools->Install a Package.
  2. After App installation, a pop-up dialog will ask if you agree to download and install R software before it proceeds. (If automatic downloading fails, you can install the App again or download R from here.)
  3. For the first time you launch the App, it downloads dependent R packages. Wait a few minutes until it is completed.

Note: If packages download fails, a pop-up dialog will ask you to copy 2 lines of commands from Results Log and run them in R to complete downloading packages. 
          If you reinstall or upgrade R after installing the app, it would not work properly. Please reinstall the app.

Operation

  1. Click App icon to open the dialog.
  2. Select data for sites and species.
  3. Customize DCA parameters: 
    • Downweight Rare Species: if selected, the influence of rare species is reduced.
    • Number of Rescaling Iterations: Number of axis rescalings.
    • Number of Segments in Rescaling: The number of segments the axis is divided into for re-scaling.
    • Rescaling Threshold: The shortest Axes to be rescaled. 
  4. Click OK to output report sheets.

Sample OPJU File
This app provides a sample OPJU file.  Right click the App icon in the Apps Gallery window, and choose Show Samples Folder from the short-cut menu. A folder will open. Drag-and-drop the project file dca_sample.opju from the folder onto Origin. The Notes window in the project shows detailed steps.
Note: If you wish to save the OPJU after changing, it is recommended that you save to a different folder location (e.g. User Files Folder).

Updates:

v1.1: Fix multiple input range bug.

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