II

Community Analysis Package

4

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Multivariate analysis .............................................................................................................. 35

5

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TWINSPAN  ............................................................................................................................. 36

6

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Principal Component Analysis (PCA) .................................................................................. 36

7

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Non metric multidimensional scaling (NMDS)  ................................................................... 37

8

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Reciprocal averaging (RA) .................................................................................................... 37

Part VIII Data transformations

39

1

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Dealing with zeros  ................................................................................................................. 39

2

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Working data screen  ............................................................................................................. 40

3

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Relativisations  ....................................................................................................................... 41

4

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Transposing data ................................................................................................................... 42

Part IX Groups

44

1

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Edit Groups  ............................................................................................................................ 45

2

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Analysis of Similarity (ANOSIM)  .......................................................................................... 48

3

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Similarity Percentages (SIMPER)  ......................................................................................... 49

Part X Principal Components Analysis 

PCA

53

1

.

Variance .................................................................................................................................. 53

2 Scores  ................................................................................................................................... 53

3

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Eigenvectors  .......................................................................................................................... 54

4

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Viewing the correlation between variables (species)  ........................................................ 54

5

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Cross products  ...................................................................................................................... 54

6

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Species correlations .............................................................................................................. 54

7

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PCA plot  ................................................................................................................................. 55

Part XI Non Metric Multidimensional

scaling

58

1

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Starting Configuration   MDS  ............................................................................................... 59

2

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Sample coordinates ............................................................................................................... 60

3 Stress  ................................................................................................................................... 60

4

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MDS plots  ............................................................................................................................... 61

Part XII Detrended Correspondence

Analysis   DECORANA

64

1

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Computations   DECORANA  ................................................................................................ 64

2

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Species Scores   DECORANA  .............................................................................................. 65

3

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Sample Scores   DECORANA  ............................................................................................... 65

4

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DECORANA plot  .................................................................................................................... 65

Part XIII Reciprocal Averaging   RA

67

1

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Computations   Reciprocal Averaging  ................................................................................ 67

2

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Species Scores   Reciprocal Averaging  .............................................................................. 67

3

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Sample Scores   Reciprocal Averaging ............................................................................... 68

4 RA plot  ................................................................................................................................... 68

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