
  The farms Env data frame has 20 rows and 4 columns. The rows are farms
  on the Dutch island of Terschelling and the columns are factors
  describing the management of grassland.


datasets

Analysis of a matrix of polytomous items using Nominal Logistic Biplots (NLB)
according to Hernandez-Sanchez and Vicente-Villardon (2013).
The NLB procedure extends the binary logistic biplot to nominal (polytomous) data.
The  individuals are represented as points on a plane and the  variables are represented
as convex prediction regions rather than vectors as in a classical or binary biplot.
Using the methods from Computational Geometry, the set of prediction regions is converted to a set of points
in such a way that the prediction for each individual is established by its closest
"category point". Then interpretation is based on distances rather than on projections.
In this package we implement the geometry of such a representation and construct computational algorithms
for the estimation of parameters and the calculation of prediction regions.

Julio Cesar Hernandez Sanchez

NominalLogisticBiplot

Biplot representations of categorical data

Env function

This data frame contains the following columns:
  <dl>
    <dt>Mois</dt><dd>five levels of soil moisture,although level 3
        does not occur in the data. Levels are labelled M1, M2, M4 and M5.</dd> <dt>Manag</dt><dd>Grassland management type (SF = standard farming,
      BF = biological farming, HF = hobby farming,
      NM = nature conservation management).
    </dd> <dt>Use</dt><dd>Grassland use (U1 = it exists production, U2 =
      intermediate,U3 = grazing).
    </dd> <dt>Manure</dt><dd>
      Manure usage (C0,C1,C2,C3 and C4)
    </dd> </dl> 

Format

J.C. Gower and D.J. Hand (1996) <em>Biplots</em>. Chapman & Hall, Table 4.6. Quoted as from:
  R.H.G. Jongman, C.J.F. ter Braak and O.F.R. van Tongeren (1987)
  <em>Data Analysis in Community and Landscape Ecology.</em>
  PUDOC, Wageningen.

Env: Ecological Factors in Farm Management.

Description

Usage

Arguments

Format

Source

References

Examples