MF (version 4.3.2)

MFClus: Clustered mitigated fraction

Description

Estimates mitigated fraction from clustered or stratified data.

Usage

MFClus(formula, data, compare = c("con", "vac"), trace.it = FALSE)

Arguments

formula

Formula of the form y ~ x + cluster(w), where y is a continuous response, x is a factor with two levels of treatment, and w is a factor indicating the clusters.

data

Data frame. See Note for handling of input data with more than two levels.

compare

Text vector stating the factor levels - compare[1] is the control or reference group to which compare[2] is compared

trace.it

Verbose tracking of the cycles? Default FALSE.

Value

a mfcluster-class data object

Details

Averages the U statistic over the clusters and computes MF from it. Clusters are excluded if they do not include both treatments.

References

Siev D. (2005). An estimator of intervention effect on disease severity. Journal of Modern Applied Statistical Methods. 4:500--508

See Also

mfcluster-class

Examples

## Not run: 
# MFClus(lesion ~ group + cluster(litter), piglung)
# 
# #  Comparing vac to con
# #
# #  MF = 0.3533835
# #
# #  By Cluster
# #     w  u         r n1 n2         mf
# #  U 25 10 0.4000000  5  5 -0.2000000
# #  K 12  2 0.2500000  4  2 -0.5000000
# #  Z 16 10 0.8333333  3  4  0.6666667
# #  D  3  2 1.0000000  1  2  1.0000000
# #  N  1  0 0.0000000  1  3 -1.0000000
# #  T  8  5 0.8333333  2  3  0.6666667
# #  P  4  1 0.5000000  2  1  0.0000000
# #  L  3  2 0.6666667  1  3  0.3333333
# #  G 15  9 0.7500000  3  4  0.5000000
# #  J 15  9 1.0000000  3  3  1.0000000
# #  W  6  3 0.7500000  2  2  0.5000000
# #  A  9  3 0.3333333  3  3 -0.3333333
# #  X 12  6 1.0000000  3  2  1.0000000
# #  F 13  7 0.7777778  3  3  0.5555556
# #  S 21 11 0.9166667  4  3  0.8333333
# #  H 14  8 0.8888889  3  3  0.7777778
# #  Y  2  1 1.0000000  1  1  1.0000000
# #  E  2  1 1.0000000  1  1  1.0000000
# #
# #  All
# #        w  u         r n1 n2        mf
# #  All 181 90 0.6766917 50 52 0.3533835
# #
# #  Excluded Clusters
# #  [1] M, Q, R, B, O, V, I, C
# ## End(Not run)