Entering the data
For a given saturation limit S , the program determines the initial value f(0) and the proportionality factor k for adapting the logistic function f (t) to the given value pairs.
The value pairs can either be entered in the table or imported or exported from a file in CSV format (comma separated values).
The data can therefore also be entered with a spreadsheet or a text editor. CSV format means one pair of values separated by a semicolon per line.
When the data are exported, the saturation limit, the dark figure and the date of the first measurement are also saved. They are marked with INF , DZIFF and TAG1 and thus recognized during import and entered in the corresponding fields.
To import or export data from a CSV file, open the local menu by double-clicking with the right mouse button on the table.
The menu items Cut Data , Copy Data and Paste Data correspond to the Cut , Copy and Paste functions of word processing and use the clipboard as well.
- Saturation limit:
- In the case of the logistic growth model, it is expected that the function values will first grow exponentially and will later approach an upper limit S asymptotically. This saturation limit is estimated and possibly varied in order to achieve a better adaptation to the measured values.
- Dark figur:
- In many cases, such as the corona pandemic, one has to assume that the actual values are many times higher than the measured ones. This can be taken into account by entering this factor as a dark figure. If no dark figure is entered, a factor of 1 is used.