# model.frame.ddformula

##### model.frame and model.matrix for ddformula

Functions added to handle fixed (time-invariant) intercept coefficient for `ddhazard`

. `model.frame.ddformula`

always has `drop.unused.levels = FALSE`

regardless of the input.

##### Usage

```
# S3 method for ddformula
model.frame(formula, data = NULL, subset = NULL,
na.action = na.fail, xlev = NULL, ...)
```# S3 method for ddformula
model.matrix(object, data = environment(object),
contrasts.arg = NULL, xlev = NULL, ...)

##### Arguments

- formula
Same as

`model.frame.default`

- data
Same as

`model.matrix.default`

- subset
Same as

`model.frame.default`

- na.action
Same as

`model.frame.default`

- xlev
Same as

`model.frame.default`

- ...
Unused

- object
Same as

`model.matrix.default`

- contrasts.arg
Same as

`model.matrix.default`

*Documentation reproduced from package dynamichazard, version 0.3.1, License: GPL-2*

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