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covariate
table is used to identify
covariate
columns in the
data table.
It has the following columns:
integer
and is the primary key for this table.
Its initial value is zero, and it increments by one for each row.
text
and has a different value for every row;
i.e., the names are unique and can act as substitutes for the primary key.
The names are intended to be easier for a human to remember than the ids.
real
and is
the reference value for the corresponding covariate; i.e.,
the covariate value that corresponds to no adjustment.
real
and is
the maximum absolute difference, from the reference value,
for the corresponding covariate.
This value must be greater than or equal zero.
The
max_difference
value null
is interpreted
as plus infinity and hence no exclusion is done for the corresponding
covariate.
data
table for which the
covariate
corresponding to this
covariate_id
has a maximum absolute difference greater than
max_difference
,
are not included in the data_subset_table
and the
fit_data_subset_table
.
covariate_id
has a maximum absolute difference greater than
max_difference
,
are not included in the predict_table
;
see the heading Covariates for the
predict table
.
covariate
table.