The scores plot shows the scores of two principle components of a calibration
plot against each other. This plot helps to identify samples with similar
spectral properties. Those samples are located in the same region of the
plot and they are close to each other. In some cases a kind of clustering
can be observed.
Additionally, this plot shows the overall variation of samples among
the two selected principle components. If the samples are widely spread
over the full range of the plot, the variation is big. Relationships between
samples can be interpreted with a high degree of certainty for such principle
If all samples stick to a particular position in the plot, the overall
variation is quite small. This indicates similarity between both principle
components and the certainty for prediction of a relationship between
samples is very low.
A typical 2D factor plot is shown below, the result window shows multiple
The samples are shown as markers. Hovering the mouse pointer in proximity
to the marker will show a Tooltip-Help with additional information about
In case of a PCA calibration
the score plot gives a convenient overview of the qualitative results
of the calibration. A good result will show all samples assigned to one
of the predefined groups ( see Calibration
Model Wizard - Step2 ) and the groups itself will be clearly separated.
It is also possible to make changes to the group assignments. Select
the samples by left clicking while
holding the Ctrl-Key.
The selected samples will be displayed with a stronger outline. Right clicking in the plot will show
the context menu. Use the commands "Assign
to" or "Assign to new
group" to change the assignment of the sample. If a change
has been made, the button Recalculate
will become active to enable the recalculation of the calibration model.
How do I change the group assignment of samples?
Select samples in the plot
clicking while holding the Ctrl-Key.
Open the context menu by
right clicking and use the commands
"Assign to" or "Assign to new group" to change
the assignment of samples.
Update the calibration
model by clicking on the button Recalculate.