Variable Selection Tab - Help

There are two groups of variables: quantitative (continuous) and qualitative (discrete).

Highlighted variables are moved between the "Available" (left side) to the "Selected" (right side) list with the appropriate arrows in the middle.

Example (continued): If you want to examine how the amount of carbon stored in live trees varies by forest type, you would:

Select "Carbon - Live Tree" (when selected, it is highlighted in violet) from the Available Quantitative Variables list
Click the GREEN right facing arrow button to move the variable from the Available list (left side) to the Selected list (right side)
Move "Forest Type" from Available Qualitative Variables to Selected Qualitative Variables

To remove a variable from the Selected list, highlight it and click the left facing arrow button.

Once you have selected both Quantitative and Qualitative variables, you may proceed to the Analysis or Mapping Tabs.

Variable Definitions:
Quantitative Variables:

Total Aboveground Carbon :: all C above mineral soil. Includes forest floor, understory, coarse woody debris, bole and crown of aboveground standing dead trees, bole and crown of live trees.
Total Belowground Carbon :: C in soil and roots. Includes soil organic carbon, roots of live and standing dead trees.
Total Tree Carbon :: C in trees. Includes crown, bole and roots of live and standing dead trees.
Total Forest Carbon :: all C in the forest. Includes Total Aboveground and Total BelowGround C as defined above.
Carbon - Live Tree :: C in crown, bole, roots of live trees
Carbon - AG Live Tree :: C in crown and bole of live trees
Carbon - Standing Dead Tree :: C in crown, bole, roots of standing dead trees
Carbon - AG Standing Dead Tree :: C in crown and bole of dead trees
Carbon - Coarse Woody Debris :: C in dead, downed wood more than 3in diameter
Carbon - Understory :: C in understory trees and shrubs. Diameter less than 1 inch
Carbon - Soil Organic :: organic C in the surface 1 meter of mineral soil, excluding coarse roots
Carbon - Forest Floor :: nonliving C mass less than 3in diameter above mineral soil
Volume - Growing Stock Density :: per acre growing stock volume. m3/hectare

Qualitative Variables: See FIADB user manual for description of each Qualitative Variable

State
County
Owner
Ownership Group
Forest Type
Forest Type Group :: see FIADB manual
Stand Size
Productivity Class - Site productivity class indicates the inherent capacity to grow crops of industrial wood
Stand Origin - Regeneration status (stand origin)
Recent Human Disturbance - Disturbed by humans within the last 5 years for a new plot, or since the last measurement for a remeasured plot. This includes silvicultural treatments and any human disturbance that effects at least 25% of the trees.
Land Clearing Status
Measurement Year
Stand Age Class
Reservation Status

Variable Units: