Quality of the representation

Finally, the analyst has to take into consideration the fact that not all the points could be well displayed in the chosen dimensions. To assess the quality of the display, he can consult the statistics provided by the ‘ca’ package showing both on the R console and in the textual output of the script, or inspect the bar chart provided by the script itself.

It can be seen that almost all the sites are well displayed by the first two dimensions or, in other words, these dimensions explain the greatest percentage of the inertia of those profiles. Only site 6 and 10 turn out to be poorly displayed, implying that the position of those two points on the scatterplot must be evaluated with caution.

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