Home   ·   FAQ   ·   User manual   ·   Publications   ·   Sponsors   ·   Target taxa   ·   Countries   ·   Bibliography   ·   Log in / register

User manual

Overview

Frequently asked questions

User account

Viewing records:

Contributing to GERDA

Contact and feedback

Visualisation and analysis

The GERDA website has tools for summarising and analysing patterns across groups of incursion responses or eradication programmes.

Users should consult Tobin et al. (2014) for examples of how these data might be properly analysed.

Note: To access this functionality you must first register for a user account and log in.

  1. Click on the "Analysis" link in the main menu.

  2. Use the drop-down box at the top of the page to select the cases to include. For more information see the section on filters.
  3. Use the links that appear down the lefthand side to summarise the data in different ways.

    Note: These analyses should be considered indicative only. Proper statistical analysis by a qualified statistician is recommended.

    • Cases per country presents a coloured map showing the countries represented in the data set. Hovering the mouse over the map shows the number of cases in that country.
    • Map of locations plots the latitude/longitude positions of cases, where these data are known. Where points are close together, hovering the mouse over the map may magnify that area. The colour of a point indicates the outcome from that eradication program (if the data include this information).
    • Simple data summary shows graphs and data tables for individual data fields, selected from a drop-down list. The type of graph presented depends on the nature of the data, but in most cases hovering the mouse over a graph will give more information.
    • Eradication outcomes (only available if the data comprise eradication programmes rather than incursion responses) shows a pie chart for the outcomes of the selected programmes.
    • Factors affecting eradication outcome (eradication programmes only) allows interrogation of individual data fields to see if they affect eradication success. Graphs and tables are produced, as well as a simple chi-square analysis of the data, if sufficient.
    • Eradication timeline (eradication programmes only) plots the cumulative number of eradications started over time. The y-axis is a log10 scale, so a straight line indicates exponential increase over time.
    • Eradication cost vs. area (eradication programmes only) plots the standardised costs of the selected eradication programmes against the infested area, both on log10 scales. The colour of each point indicates the eradication outcome and a linear regression line is given. Hovering the mouse over the regression line allows estimation of the cost of a programme of a particular size.
    • Eradication outcome vs. area (eradication programmes only) plots eradication success or failure in terms of the infested area.

Related topics:

Blank data sheet