Description Usage Arguments Value Note References
Simulate surrogate response values for cumulative link regression models using the latent method described in Liu and Zhang (2017).
1 2 |
object |
An object of class |
method |
Character string specifying the type of surrogate to use; for details, see Liu and Zhang (2017). For cumulative link models, the latent variable method is used. For binary GLMs, the jittering approach is employed. (Currently ignored.) |
jitter.scale |
Character string specifying the scale on which to perform
the jittering. Should be one of |
nsim |
Integer specifying the number of bootstrap replicates to use.
Default is |
... |
Additional optional arguments. (Currently ignored.) |
A numeric vector of class c("numeric", "surrogate")
containing
the simulated surrogate response values. Additionally, if nsim
> 1,
then the result will contain the attributes:
boot.reps
A matrix with nsim
columns, one for each
bootstrap replicate of the surrogate values. Note, these are random and do
not correspond to the original ordering of the data;
boot.id
A matrix with nsim
columns. Each column
contains the observation number each surrogate value corresponds to in
boot.reps
. (This is used for plotting purposes.)
Surrogate response values require sampling from a continuous distribution;
consequently, the result will be different with every call to
surrogate
. The internal functions used for sampling from truncated
distributions are based on modified versions of
rtrunc
and qtrunc
.
Liu, Dungang and Zhang, Heping. Residuals and Diagnostics for Ordinal Regression Models: A Surrogate Approach. Journal of the American Statistical Association (accepted). URL http://www.tandfonline.com/doi/abs/10.1080/01621459.2017.1292915?journalCode=uasa20
Nadarajah, Saralees and Kotz, Samuel. R Programs for Truncated Distributions. Journal of Statistical Software, Code Snippet, 16(2), 1-8, 2006. URL https://www.jstatsoft.org/v016/c02.
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