gamSim                 package:mgcv                 R Documentation

Simulate example data for GAMs

Description:

     Function used to simulate data sets to illustrate the use of 
     'gam' and 'gamm'. Mostly used in help files to keep down  the
     length of the example code sections.

Usage:

     gamSim(eg=1,n=400,dist="normal",scale=2)

Arguments:

      eg: numeric value specifying the example required.

       n: number of data to simulate.

    dist: character string which may be used to spcify the distribution
          of the response.

   scale: Used to set noise level.

Details:

     See the source code for exactly what is simulated in each case. 

1 Gu and Wahba 4 univariate term example.

2 A smooth function of 2 variables.

3 Example with continuous by variable.

4 Example with factor by variable.

5 An additive example plus a factor variable.

6 Additive + random effect.

7 As 1 but with correlated covariates.

Value:

     Depends on 'eg', but usually a dataframe, which may also contain
     some information on  the underlying truth. Sometimes a list with
     more items, including a data frame for model fitting. See source
     code or helpfile examples where the function is used for further
     information.

Author(s):

     Simon N. Wood simon.wood@r-project.org

See Also:

     'gam', 'gamm'

Examples:

     ## see ?gam

