Description Usage Arguments Details Value Author(s) References See Also Examples
This function fits a null model to t-statistics, i.e., a two-component mixture, with one component being central t-distribution, the other component being scaled central t-distribution with scale parameter larger than 1. The mixing proportion for the central t-distribution is pi0.
1 2 3 4 |
tstat |
A numeric vector of t-statistics. |
df |
A numeric scalar or vector of the same length as |
starts |
A list of two components, |
The function finds maximum likelihood estimates of pi0
and scale
. pi0
should lie between 0 and 1. scale
should be larger than 1. The L-BFGS-B
method is used in optimization function optim
.
The parncp
function with zeromean=TRUE
fits the same model, except that it returns ncpest
object instead of hisemit
object.
A hesimit
object.
Long Qu rtistician@gmail.com
Qu, Nettleton, Dekkers (2012) A Hierarchical Semiparametric Model for Incorporating Inter-gene Information for Analysis of Genomic Data. Biometrics, 68(4):1168-1177
parncp
, scaledTMix.sat
, scaledTMix.psat
1 2 3 | set.seed(99927220)
(tstat=rt(5,1))
scaledTMix.null(tstat,1)
|
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