LogisticLogNormalGrouped-class | R Documentation |
LogisticLogNormalGrouped
LogisticLogNormalGrouped
is the class for a logistic regression model
for both the mono and the combo arms of the simultaneous dose escalation
design.
LogisticLogNormalGrouped(mean, cov, ref_dose = 1)
.DefaultLogisticLogNormalGrouped()
mean |
( |
cov |
( |
ref_dose |
( |
The continuous covariate is the natural logarithm of the dose x
divided by
the reference dose x*
as in LogisticLogNormal
. In addition,
I_c
is a binary indicator covariate which is 1 for the combo arm and 0 for the mono arm.
The model is then defined as:
logit[p(x)] = (alpha0 + I_c * delta0) + (alpha1 + I_c * delta1) * log(x / x*),
where p(x)
is the probability of observing a DLT for a given dose x
,
and delta0
and delta1
are the differences in the combo arm compared to the mono intercept
and slope parameters alpha0
and alpha1
.
The prior is defined as
(alpha0, log(delta0), log(alpha1), log(delta1)) ~ Normal(mean, cov).
Typically, end users will not use the .DefaultLogisticLogNormalGrouped()
function.
ModelLogNormal
, LogisticLogNormal
.
my_model <- LogisticLogNormalGrouped(
mean = c(-0.85, 0, 1, 0),
cov = diag(1, 4),
ref_dose = 50
)
my_model
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