Supports Formula syntax as used in earlier (<0.8-0) versions of R2MLwiN. A model
formula, as a formula object (or a character string) is translated into
an R list object. Called by runMLwiN if oldsyntax = TRUE
(when user specifies levID not NULL in runMLwiN function
call). For corresponding function supporting new syntax, see
Formula.translate.
Formula.translate.compat(Formula, levID, D = "Normal", indata)A formula object (or a character string) specifying a
multilevel model. See Value for details.
A character (vector) specifying the level ID(s).
A character string/vector specifying the distribution to be
modelled, which can include 'Normal' (the default), 'Binomial',
'Poisson', 'Negbinom', 'Unordered Multinomial',
'Ordered Multinomial', 'Multivariate Normal', or 'Mixed'.
A data.frame object containing the data to be modelled.
Outputs an R list object, which is then used as the input for
write.IGLS and/or write.MCMC.
If Formula is a character string, then the following
syntax applies:
~ A tilde is used to separate response variable(s) and
explanatory variable(s).
() Round brackets are used to specify each random
variable in the model together with its fixed/random part information.
| Separates explanatory variable(s) (placed to the right of
|) from the fixed/random part information (placed to the left of
|) when placed within ().
[] When placed
immediately after an explanatory variable, indicates that the variable is
categorical. The string in the [] represents the reference category;
if empty, no reference category is used; See note.
: Indicates an interaction term: i.e. the variables adjacent to :, and
separated by it, are interacted with each other.
0 When placed to the left of | within () indicates that the variables
to the right of | within the same () are to be added to the
fixed part of the model.
1 When placed to the left of
| within () indicates that the coefficients of the variables
placed to the right of | within the same () are to be allowed
to randomly vary at level 1 (and so on for 2 for level 2, 3 for level 3, etc.)
0s/0c When placed to the left of | within ()
indicates that separate (hence s) / common (hence c)
coefficients for the variables to the right of | within the same
() are to be added to the fixed part (hence 0) of multivariate
normal, multinomial and mixed responses models.
2s/2c When
placed to the left of | within () indicates that separate
(hence s) / common (hence c) coefficients for the variables to
the right of | within the same () are to be added to the
random part of the model, and allowed to vary at level 2; applies to
multivariate normal, multinomial and mixed responses models only.
{} gives a vector of binary indicators specifying a
common coefficient. 1 is to include the component at the corresponding
positions; zero otherwise. These digits are separated by commas; applies to
multivariate normal, multinomial and mixed responses models only.
. Used for adding a separate coefficient for a particular
component at a specific level; applies to multivariate normal, multinomial
and mixed responses models only
If Formula is a formula object, 0s/0c, 2s/2c, .... and
{} have to be replaced by `0s`/`0c`, `2s`/`2c`, ....
and () respectively. Other syntax remains the same.