Description Usage Arguments Details Author(s) See Also Examples
Plot standardized differences of covariates
1 2 3 4 5 6 
x 
an object of class 'bal.matched.data.frame',
'bal.matched.data.frames' or 'bal.matched.pscore'. The previous use of

sel 
a vector of strings indicating covariates to be
checked. The default is NULL, i.e. all variables selected previously
in 
plot.alpha 
a logical value indicating whether a vertical line
for the significance level chosen in 
mymar 
a graphical parameter, see 
pch.p 
a vector of two integers indicating the symbols. 
col.p 
a vector of two strings indicating symbol colors. 
colorspace 
a logical value indicating whether

cex.p 
a numeric indicating the size of symbols. 
line.stdf 
an integer indicating the line type connecting the sympols. 
line.alpha 
an integer indicating the line type presenting the significance level. 
with.legend 
a logical value indicating whether the legend is given. 
legend.label 
a vector of two strings indicating the labels. 
legend.cex 
a numeric indicating the size of the legend font. 
legend.xy 
a vector of two integers indicating x and ycoordinates for legend position. 
... 
further arguments for graphics. 
Standardized difference are proposed to check the balance of
covariates after matching. The function plot.stdf()
offers a
graphical check of it presenting standardized differences of
covariates between treatment groups before and after matching.
The usage of plot.stdf()
requires the previous use of
ps.balance(..., method='stand.diff', ...)
and is only available
when matching is done before via ps.match()
.
Susanne Stampf susanne.stampf@usb.ch
plot
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24  ## STU1
data(stu1)
stu1.ps < pscore(data = stu1,
formula = therapie~tgr+age)
stu1.match < ps.match(object = stu1.ps,
ratio = 2,
caliper = 0.5,
givenTmatchingC = FALSE,
matched.by = "pscore",
setseed = 38902)
stu1.bal.match < ps.balance(object = stu1.match,
sel = c("tgr","age"),
method = "stand.diff",
alpha = 20)
plot.stdf(x = stu1.bal.match,
main = "Stu1 study: Standardized differences",
cex.axis = 1.2,
legend.cex = 1.3,
cex.main = 1.5,
las = 1,
col.p = c("black", "gray"))

Loading required package: lme4
Loading required package: Matrix
Argument 'givenTmatchingC'=FALSE: Treated elements were matched to each untreated element.
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