Buchi DuMaster D-480, Руководство по эксплуатации

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Operating instructions DuMaster D-480 ©BÜCHI Labortechnik AG
7 - Using the instrument 149

You can generate statistical data manually. In this case, the user combines any samples in
groups. Statistical data are then automatically generated for these groups.
Generating statistical data fully automated
Proceed as follows:

Click
Statistics > By names
. A warning appears which has to be confirmed.

Respond to the warning note:
If statistics memory...

... may be deleted: Click
Yes
.

... must not be deleted: Click
No
and safe your data. Afterwards, repeat the steps descibed
above.

Samples of the same name are combined in groups and the mean values and standard deviation
are computed automatically and displayed in the statistics view.

If you want to exclude a sample from the calculation afterwards, select the appropriate sample
line in the statistics view. Subsequently execute the command
Statistics > Include/Exclude
sample
or click the button in the toolbar . The sample is discarded and the calculation
updates automatically.
Generating statistical data manually
Proceed as follows:

Select all samples that you want to combine in a group in the sample view (text view). To do so,
click the "No." cell of the corresponding line.

Select multiple contiguous samples by clicking and holding the SHIFT key.

Select multiple non-contiguous samples by clicking and holding the CTRL key.

Select
Statistics > Group
. The selected samples are displayed as a group in statistics view.
Mean values and standard deviation are computed automatically.

If you want to exclude a sample from the calculation afterwards, select the appropriate sample
line in the statistics view. Subsequently execute the command
Statistics > Include/Exclude
sample
or click the button in the toolbar . The sample is discarded and the calculation
updates automatically.
Formulae for generating statistical data
Statistical data
The following statistical data can be generated fron sample groups:

Mean value of the sample group

Absolute standard deviation of the sample group

Relative standard deviation of the sample group

Delta of the sample group