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Incremental data comprises observations of the size of organisms at two points in time. To fit a growth curve to such data, you will also need to supply at least one observation of known size at a known age. If File|New|Incremental is selected, an empty grid will be formed with titles, Sample, Size T0, Size T1, Time Gap, Known Age and Known size in place.
Sample identifies the column as holding an identification number or name for the individual.
Size T0 identifies the column as holding length or weight of the individual when first measured.
Size T1 identifies the column as holding length or weight of the individual when measured on a second occasion.
Time Gap identifies the column as holding data on the time difference between the measurements at time T0 and T1.
Known Age for a growth curve to be fitted to incremental data it is necessary to know the size of at least one individual at a known age. Place in this column a known age, as either a real or integer value.
Known Size place in this column the size of individuals of known age.
To insert a new row, highlight any cell in the bottom row of the grid so that it turns blue - as shown below - then press the Down arrow key on your keyboard.
To delete a row, highlight any cell in that row, so that the cell itself is highlighted blue, rather than its contents, and press the Delete key on your keyboard. Please note that the Undo function will not apply to row deletion; once a row has been deleted, it cannot be restored.