Synth (version 0.1-2)

gaps.plot: Plots Gap in Outcome Trajectories between the Treated its Synthetic Control Unit

Description

This function plots the gaps in the trajectories of the outcome variable for the treated unit and the synthetic control group constructed by synth and dataprep. The user can specifify whether the whole time period or only the pre-treatment period should be plotted.

Usage

gaps.plot(synth.res = NA,
       dataprep.res = NA,
       Ylab = c("Title"),
       Xlab = c("Time"),
       Main = c("Gaps: Treated - Synthetic"),
       tr.intake = NA,
       Ylim = NA,
       Z.plot = FALSE)

Arguments

synth.res

Output list created by synth.

dataprep.res

Output list created by dataprep.

tr.intake

Optional scalar to indicate the time of treatment intake with a vertical line.

Ylab

Optional label for Y axis.

Xlab

Optional label for X axis.

Ylim

Optional Ylim.

Main

Optional main title.

Z.plot

Flag. If true, only pretreatment period is plotted.

Value

• The plot of trajectories.

Details

The trajectory of the outcome for the synthetic control group is calculated as: dataprep.res$Y0plot %*% synth.res$solution.w. You can use this calculation to construct custom made plots.

References

Abadie, A. and Gardeazabal, J. (2003) Economic Costs of Conflict: A Case Study of the Basque Country American Economic Review 93 (1) 113--132 http://ksghome.harvard.edu/~.aabadie.academic.ksg/ecc.pdf Abadie, A., Diamond, A., Hainmueller, J. (2007) Synthetic Control Methods for Comparative Case Studies: Estimating the Effect of California's Tobacco Control Program NBER Technical Working Paper no 335 http://www.people.fas.harvard.edu/~jhainm/

See Also

gaps.plot,synth.plot,dataprep,synth.tab

Examples

##---- Should be DIRECTLY executable !! ----
##-- ==>  Define data, use random,
##--	or do  help(data=index)  for the standard data sets.