Simple Case mode assumes that there are two nonmixed samples
(typically the evidentiary sample and the suspect) that should be
compared. At the beginning Grape's main window looks as follows
If you want to change the default names "Evidentiary Sample" and
"Suspect" to something else (for example, enter the real name of the
suspect) click Setup Case
button and you will be able to do so.
The loci you can use for your statistical evaluations can be selected
from the Available Loci library that Grape loads at the start of the
program from file loci.loc. Grape comes with a predefined set of
Available Loci, but it is quite common that you may want to change loci
in this library (for example, change alleles frequencies or add another
locus). To do so
just click Edit Loci button to
change existing loci or Add New Locus
button and you will be provided with a convenient graphical interface
to complete the task.
Since probably only a part of all loci from the Available Loci library
are actually used in calculations you need to select this part: click Select Loci button to do so.
Next step is to set genotypes of the suspect and the evidentiary
sample. Grape has a nice tool for setting genotypes that allows user to
genotypes quickly and minimize the possibility of incorrect input.
Besides manual genotype input Grape also supports importing of
from the embedded databases that can contain hundreds of thousand
of records. This automatic input reduces the routine human data entry,
and almost eliminates the possibility of an error. Both manual and
automatic input is available through Set Genotypes dialog.
Grape supports calculations for structured population: use Choose Θ
button to set the value of the coancestry coefficient.
Case Info button allows you to
enter additional text information that helps organize your data
properly. Three fields are available: case name, reference number and
comments. You can use these fields in any manner you want.
At this stage the case is created and ready for evaluation. Grape's
main window now looks like the following
To begin calculations click "Calculate" button. Calculation results
will be displayed at the top of the window. The results include match
probabilities and likelihood ratios calculated for each selected loci
as well as total values over all loci (assuming statistical
between loci). The resulting document for the example above is the
This document can be printed or saved in a file. If
this document is saved it can be opened again with Grape. Such file is
HTML format and can be viewed (exactly the same way as in Grape)
with any Internet browser like Microsoft Internet Explorer. It can be
rather convenient if, for example, you would like to send this document
to somebody else who
does not have Grape installed: even in this case that person can have
exactly the same screen as Grape displays in its main window.
With thousands of cases processed saving resulting information in file
format becomes not flexible
enough for proper data organizing. Grape provides capability of saving
cases into embedded databases that have advanced tools of quick
searching and managing of large volumes of information. Additionally,
Grape databases allow for effective data searches within its databases
for matches that make it
possible for instance to find serial rapes. To save a case into a
database click Save to Database