Analyze header data
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Menu: Export | Analyze header data
This option enables to visualize the relation between two header data items (including species number and excluding remarks) in a graph. The graph is presented by a Visual Basic Component which gives you the possibility to manipulate the graph. The screen shot below is meant to clarify this option. However, this help does not contain a full explanation of this option.
X-axis: Select an item to represent the X-axis (double-click or press on Ins). Basically you can choose each desired item.
Y-axis: Select an item to represent Y-axis (double-click or press on Ins). If you select the same item as was selected for the X-axis, the frequency of the chosen item will be calculated ( e.g. the number of times each syntaxon is present in the selection). In all other cases you have to choose a numerical item (e.g. number of species per relevé), since the data have to be reduced to means per unit of the X-axis.
Interval: State the difference between two values on the X-axis (e.g. year: 1930-1995, 1935-1940, etc.). You can only choose intervals higher than 0 if the subject is numerical (e.g. year, and thus not syntaxon).
The following is applied at the calculations: >= lower limit and < upper limit.
Sort labels: Mark this option if the labels on the X-axis have to be sorted.
Exclude empty entries: Mark this option if missing values have to be omitted from the calculations.
If you have finished the settings, click Draw to visualize the graph.
A screen shot showing a graphic is given below. Click on the icons of the toolbar for elucidating their function.
Please note that relevés first need to be selected before they can be exported.