Documentation
View on myExperiment
The Keyfit delta Workflow provides an environment to calculate the Keyfit delta value. Keyfitz’s delta is a measure of the distance between any two probability vectors (Keyfitz 1968). In this case is a measure of the distance between n (Observed Stage Distribution) and w (Stable Stage Distribution). The maximum value is 1 and the minimum value is 0 (when the vectors are identical).
============================================================
This workflow has been created by the Biodiversity Virtual eLaboratory (BioVeL http://www.biovel.eu/) project. BioVeL is funded by the EU’s Seventh Framework Program, grant no. 283359.
This workflow was created using and based on Package “popdemo” in R.
Caswell, H. 2001. Matrix population models: Construction, analysis and interpretation, 2nd Edition. Sinauer Associates, Sunderland, Massachusetts.
Jongejans E. & H. de Kroon. 2012. Matrix models. Chapter in Encyclopaedia of Theoretical Ecology (eds. Hastings A & Gross L) University of California, p415423
Keyfitz, N. 1968. Introduction to the Mathematics of Populations. AddisonWesley, Reading, MA, USA.
Oostermeijer J.G.B., M.L. Brugman; E.R. de Boer; H.C.M. Den Nijs. 1996. Temporal and Spatial Variation in the Demography of Gentiana pneumonanthe, a Rare Perennial Herb. The Journal of Ecology, Vol. 84(2): 153166.
Stott, I., D.J. Hodgson and S. Townley. 2013. popdemo: Provides Tools For Demographic Modelling Using Projection Matrices. Version 0.13.
Inputs (2)
Data Inputs (1)
stageMatrixFile (text/plain)
Description:
Here comes the stage matrix without the stage names (as you see in the example). It should be provied as a txtfile.
Example from:
J. Gerard B. Oostermeijer; M.L. Brugman; E.R. de Boer; H.C.M. Den Nijs. 1996. Temporal and Spatial Variation in the Demography of Gentiana pneumonanthe, a Rare Perennial Herb. The Journal of Ecology, Vol. 84(2): 153166.
Example value:
0.0000 0.0000 0.0000 7.6660 0.0000
0.0579 0.0100 0.0000 8.5238 0.0000
0.4637 0.8300 0.9009 0.2857 0.8604
0.0000 0.0400 0.0090 0.6190 0.1162
0.0000 0.0300 0.0180 0.0000 0.0232
Parameter Inputs (1)
abundances (text/plain)
Description:
The initial abundance on the field or the observed structure per stage.
Gentiana pneumonanthe stage matrix has 5 stages with its respective abundance:
stage abundance
1 S (seedlings) 69
2 J (Juveniles) 100
3 V (vegetative) 111
4 G (reproductive individuals) 21
5 D (dormant plants) 43
The respective abundance numbers must be filled one by one. Fill a number and then press enter, then press add value and fill again the next number, repeat the action until you have fill all the abundance values.
Example value:
[69, 100, 111, 21, 43]
Outputs (1)
Result Outputs (1)
keyfitzDelta (text/csv)
Description:
Keyfitz’s ?:
Keyfitz’s delta is a measure of the distance between any two probability vectors (Keyfitz 1968). In this case is a measure of the distance between n (Observed Stage Distribution) and w (Stable Stage Distribution). The maximum value is 1 and the minimum value is 0 (when the vectors are identical).
Example value:
0.3340403
Error/Log Outputs (0)
None
R Scripts (2)
ReadStageMatrixFromFile
Description:
Inputs: stage_matrix_file
Outputs: stage_matrix
Script:

CalculateKeyfitzDelta
Description:
Inputs: stage_matrix, abundances
Outputs: keyfitz_delta
Script:

Details
Filename:
Keyfitz_delta_V1.t2flow
Category:
Population Modelling
Author:
Maria Paula BalcázarVargas, Jonathan Giddy and G. Oostermeijer
Uploader:
Maria BalcazarVargas
Uploaded at:
21 Aug 2014 18:15:48 UTC