Dissimilarity

One of the types of objects in Praat.

It represents a one-way table with dissimilarities between "objects".

## Creating a Dissimilarity from data in a text file

Suppose you have three objects A, B and C. In one way or another, you have acquired the following (symmetric) dissimilarities: δAB = 2 (= δBA) , δAC = 1 (= δCA), and δBC = 1.4 (= δCB), where δAB represents the dissimilarity between object A and object B.

You can create a simple text file like the following:

`"ooTextFile" ! The line by which Praat can recognize your file
` `"Dissimilarity" ! The line that tells Praat about the contents
` `3 "A" "B" "C" ! Number of columns, and column labels
` `3 ! Number of rows
` `"A" 0 2 1 ! Row label (A), A-B value, A-C value
` `"B" 2 0 1.4 ! Row label (B), B-A value, B-C value
` `"C" 1 1.4 0 ! Row label (C), C-A value, C-B value
`

Notice that:

  • the row and column labels are identical.
  • the matrix elements on the diagonal are zero.
  • the matrix is symmetrical.

This text file can be read with the Read from file... command. Since a Dissimilarity object has the data structure of a square symmetrical TableOfReal, you could also start from an appropriate TableOfReal object and cast it to a Dissimilarity object.

## Commands

Creation

  • Confusion: To Dissimilarity...

Drawing

  • Draw as numbers...
  • Draw as squares...

Query

  • Get column mean (index)...
  • Get column mean (label)...
  • Get column stdev (index)...
  • Get column stdev (label)...
  • Dissimilarity: Get additive constant

Modification

  • Formula...
  • Set value...
  • Remove column (index)...
  • Insert column (index)...
  • Set row label (index)...
  • Set row label (label)...
  • Set column label (index)...
  • Set column label (label)...

Multidimensional scaling analysis

  • Dissimilarity: To Configuration (monotone mds)...
  • Dissimilarity: To Configuration (i-spline mds)...
  • Dissimilarity: To Configuration (interval mds)...
  • Dissimilarity: To Configuration (ratio mds)...
  • Dissimilarity: To Configuration (absolute mds)...
  • Dissimilarity: To Configuration (kruskal)...
  Transformations
  • Dissimilarity: To Distance...
  • Dissimilarity: To Weight

### Links to this page

- Confusion: To Dissimilarity (pdf)...
- Create INDSCAL Carroll & Wish example...
- Create letter R example...
- Dissimilarity & Configuration & Weight: Get stress...
- Dissimilarity & Configuration & Weight: To Configuration...
- Dissimilarity & Configuration: Draw regression (absolute mds)...
- Dissimilarity & Configuration: Draw regression (i-spline mds)...
- Dissimilarity & Configuration: Draw regression (interval mds)...
- Dissimilarity & Configuration: Draw regression (monotone mds)...
- Dissimilarity & Configuration: Draw regression (ratio mds)...
- Dissimilarity & Configuration: Draw Shepard diagram...
- Dissimilarity & Configuration: Get stress (absolute mds)...
- Dissimilarity & Configuration: Get stress (i-spline mds)...
- Dissimilarity & Configuration: Get stress (interval mds)...
- Dissimilarity & Configuration: Get stress (monotone mds)...
- Dissimilarity & Configuration: Get stress (ratio mds)...
- Dissimilarity & Configuration: To Configuration (absolute mds)...
- Dissimilarity & Configuration: To Configuration (i-spline mds)...
- Dissimilarity & Configuration: To Configuration (interval mds)...
- Dissimilarity & Configuration: To Configuration (kruskal)...
- Dissimilarity & Configuration: To Configuration (monotone mds)...
- Dissimilarity & Configuration: To Configuration (ratio mds)...
- Dissimilarity & Weight: To Configuration...
- Dissimilarity & Weight: To Configuration...
- INDSCAL analysis
- Kruskal analysis
- MDS models
- Multidimensional scaling
- Similarity: To Dissimilarity...
- Weight