effect: Posterior density of the treatment effect estimate from an...

In SVMMatch: Causal Effect Estimation and Diagnostics with Support Vector Machines

Description

effect characterizes the posterior density of the treatment effect, as estimated through SVMMatch.

Usage

	effect(obj, color=TRUE, quant=c(0.025,0.975), legend.pos="topleft",
		label.main="Posterior Density of Effect Estimate", label.x="Outcome",
		label.y="Density")
		

Arguments

obj	A fitted SVMMatch object.
color	Whether to plot in color or black and white. TRUE or FALSE.
quant	Quantiles of the effect to be marked on the figure.
legend.pos	Where to place the margin. See the help file for legend.
label.main	Main title for figure
label.x	X-axis label.
label.y	Y-axis label.

Details

Characterizes and plots the posterior density of the treatment effect, given an SVMMatch object. At each posterior draw, a set of balancing weights are constructed, as described in Ratkovic (2014). A treatment effect is estimated for each posterior draw of balancing weights, and the posterior density returned as a figure.

Value

balance

Posterior density of imbalance, by covariate.

Author(s)

Marc Ratkovic

References

Ratkovic, Marc. 2014. "Balancing within the Margin: Causal Effect Estimation with Support Vector Machines." Working paper.

See Also

svmmatch, legend

Examples

## Not run: 
##See svmmatch() for a full implementation
##Load data
	data("LaLonde")
	Data1<-LaLonde
	Data1<-Data1[Data1$exper==0|Data1$treat==1,]
	attach(Data1)	

##Format X matrix
	varnames<-c("age","educ","black","married","nodegr","hisp",
		"re75","re74")
	X<-cbind(Data1[,varnames],Data1$re75==0,Data1$re74==0)
	X<-as.matrix(X)

##Fit model
	set.seed(1)
	m1.param<-svmmatch(treat, X, dv=re78, burnin=100, gibbs=100, thin=5)

##Summarize treatment effect
	effect1<-effect(m1.param)

	
## End(Not run)

Example output

Warning messages:
1: In par(par.old) : graphical parameter "cin" cannot be set
2: In par(par.old) : graphical parameter "cra" cannot be set
3: In par(par.old) : graphical parameter "csi" cannot be set
4: In par(par.old) : graphical parameter "cxy" cannot be set
5: In par(par.old) : graphical parameter "din" cannot be set
6: In par(par.old) : graphical parameter "page" cannot be set

SVMMatch documentation built on May 2, 2019, 6:34 a.m.