wardinit {ClustGeo} | R Documentation |

## Ward aggregation measures between singletons

### Description

This function calculates the Ward aggregation measures between pairs of singletons.

### Usage

```
wardinit(D, wt = NULL)
```

### Arguments

`D` |
a object of class "dist" with the dissimilarities between the n obsevations.
The function |

`wt` |
vector with the weights of the observations. By default, wt=NULL corresponds to the case where all observations are weighted by 1/n. |

### Details

The Ward agreggation measure between to singletons i and j weighted by wi and wj is : (wiwj)/(wi+wj)dij^2 where dij is the dissimilarity between i and j.

### Value

Returns an object of class dist with the Ward aggregation measures between the n singletons.

### References

M. Chavent, V. Kuentz-Simonet, A. Labenne, J. Saracco. ClustGeo: an R package for hierarchical clustering with spatial constraints. Comput Stat (2018) 33: 1799-1822.

*ClustGeo*version 2.1 Index]