Take a vector fobs
of performances of assemblages
that share the same assembly motif,
and return a vector of performances predicted
as the arithmetic mean
of performances of other assemblages.
amean_bymot_jack(fobs, jack)
a numeric vector. The vector fobs
contains the
quantitative performances of assemblages.
an integer vector of length 2
.
The vector specifies the parameters for jackknife method.
The first integer jack[1]
specifies the size of subset,
the second integer jack[2]
specifies the number of subsets.
Return a vector of length(fobs)
.
Its values are computed as the arithmetic mean
of performances of assemblages
that share a same assembly motif,
by excluding a subset of assemblages
containing the assemblage to predict.
Predicted performances are computed using arithmetic mean
opt.mean = "amean"
of performances of assemblages
that share a same assembly motif opt.model = "bymot"
.
The assemblages belonging to a same assembly motif are divided
into jack[2]
subsets of jack[1]
assemblages.
Prediction is computed by excluding jack[1]
assemblages,
including the assemblage to predict.
If the total number of assemblages belonging
to the assembly motif is lower than jack[1]*jack[2]
,
prediction is computed by Leave-One-Out (LOO).