Start GeneClass2 from your "Start" menu, folder "CBGP". The splash-screen appears, then the main window of GeneClass2.
Load a reference datafile by clicking on the upper "Open" button
[H1] and choose the datafile in
the selector.
Load a to-be-assigned individuals datafile by clicking on the lower "Open"
button [H1'] and choose the datafile
in the selector.
Note that for self-assignment purposes only a single file is needed (i.e. the
reference file [H1]) .
Choose "Assignment" [H2]
in the first tab of the main window and "Individuals" [H3]
in the "Assign:" box.
Note that assignment statistics can be also computed for groups of individuals
rather than individual genotypes (Baudouin
& Lebrun, 2000). Groups of individuals must be coded as populations
in the samples file.
The assignment threshold (without probability computation) can be set by sliding the "Assignment threshold of scores" cursor [H4] (see computations without associated probabilities section for a definition of scores).
Click on the "2) Criteria for Computation" [I1] tab and choose the desired criterion (e.g. "Rannala & Mountain" [I2], see Rannala & Mountain, 1997 and Cornuet et al., 1999). Bayesian and Frequencies-based methods appears to be better than distance-based methods (see Cornuet et al. 1999 for a comparative study).
If you want to compute the probability that an individual belongs to each reference
population, click on the "3) Probability computation" tab [J1],
and then check the "Enable probability computation (Monte-Carlo resampling)"
box [J2].
You can now choose a resampling algorithm [J3],
eg. Paetkau et al. (2004) (recommended,
but see Rannala & Mountain 1997 and
Cornuet et al. 1999). Slide the
cursor [J4] to define the minimum
number of simulated individuals (eg. 1000, default value or 10000, leading to
ten times longer but more precise computation), and the cursor [J5]
setting the type one error eg. 0.01, default value (see Cornuet
et al. 1999; Paetkau et al.
2004 ).
If needed, you can deselect some loci in the "Loci selection" tab
[K1]. Deselected loci will be
ignored during calculations.
Finally, click on the "Start" button [K2]
to run the computation.
The program displays the "Log file" [L1]
that displays the running parameters.
The progress bar and a counter shows the state of the computation [L2].
The "Stop" button [L3]
allows the computation to be aborted.
Once computations are finished, the results are displayed in a grid in which
the probability for each individual belonging to each reference population is
displayed [M1] (Cornuet
et al., 1999). If a given individual's probability in a given reference
population is lower than the previously defined threshold, the value is greyed
[M2].
Results can be printed ("Print" button [M3])
or exported in csv format ("Export" button [M4]).
Computations without associated probabilities:
If you did not check the "Enable probability computation (Monte-Carlo
resampling)" box [J2] the
results are displayed as follows: The five first pairs of columns show, for
each individual, the most likely populations and their relatives scores (cf.
note below) in decreasing order [N1].
The right part of the grid displays -log values of the likelihoods [N2].
The number of displayed scores can be changed with the spin edit area [N3].
Note: In a reference file with k populations the score of an individual i in a population l is computed as follow:
,
with Li,l the likelihood value of the individual i in the population l.
