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# Setting parameter values:
Models, functions and probability distributions all take named
parameters in BAli-Phy. Parameters are in given square brackets:
Model(parameter1=value,parameter2~distribution]
Values are given with `=`, and priors are given with `~`.
A value or prior for a parameter must be given, unless the
model or function has a default value specified.
For example, the Tamura-Nei (tn93) model has 3 parameters, `kappaPur`,
`kappaPyr`, and `pi` with default priors. Focusing just on the first
parameter, the following are the same:
tn93
tn93(kappaPur~logNormal(log(2),0.5))
It is also possible to specify parameter values by position only:
tn93(2,~logNormal(log(1),0.5))
The parameter names, order, type and default values for any function
can be found by giving that function name to the `help` command.
For example `bali-phy help tn93` gives information on the tn93 model.
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