disto: Compute and plot a distogram

In pastecs: Package for Analysis of Space-Time Ecological Series

Description

A distogram is an extension of the variogram to a multivariate time-series. It computes, for each observation (with a constant interval h between each observation), the euclidean distance normated to one (chord distance)

Usage

disto(x, max.dist=nrow(x)/4, plotit=TRUE, disto.data=NULL)

Arguments

x	a matrix, a data frame or a multiple time-series
max.dist	the maximum distance to calculate. By default, it is the third of the number of observations (that is, the number of rows in the matrix)
plotit	If plotit=TRUE then the graph of the distogram is plotted
disto.data	data coming from a previous call to disto(). Call the function again with these data to plot the corresponding graph

Value

A data frame containing distance and distogram values

Author(s)

Frédéric Ibanez ([e-mail]), Philippe Grosjean ([e-mail])

References

Dauvin, J.C. & F. Ibanez, 1986. Variations à long-terme (1977-1985) du peuplement des sables fins de la Pierre Noire (baie de Morlaix, Manche Occidentale): analyse statistique de l'évolution structurale. Hydrobiologia, 142:171-186.

Ibanez, F. & J.C. Dauvin, 1988. Long-term changes (1977-1987) in a muddy fine sand Abra alba - Melinna palmate community from the Western English Channel: multivariate time-series analysis. Mar. Ecol. Prog. Ser., 49:65-81.

Mackas, D.L., 1984. Spatial autocorrelation of plankton community composition in a continental shelf ecosystem. Limnol. Ecol., 20:451-471.

See Also

vario

Examples

data(bnr)
disto(bnr)

Example output

Loading required package: boot
   distance distogram
1         1 0.3581454
2         2 0.4797966
3         3 0.5173366
4         4 0.5501900
5         5 0.4942032
6         6 0.4922207
7         7 0.5422460
8         8 0.5774747
9         9 0.6148662
10       10 0.6674661
11       11 0.6634647
12       12 0.6457200
13       13 0.6567708
14       14 0.6706163
15       15 0.6743301
16       16 0.6943444
17       17 0.7143640
18       18 0.7279900
19       19 0.7162906
20       20 0.6569722
21       21 0.6708284
22       22 0.6974970
23       23 0.6976051
24       24 0.7008844
25       25 0.6854326
26       26 0.6526971

pastecs documentation built on May 2, 2019, 3:36 p.m.