plot_confregion: Plot Confidence Region

In ivregEX: Create Independent Evidence in IV Analyses and Do Sensitivity Analysis in Regression and IV Analysis

Description

This function provides a visual representation of the confidence regions capturing the three analyses, OLS, 2SLS and EX.

Usage

	plot_confregion(est, se, t, roundto = 3, xlims, ylims = c(0, .7), ypos = .35, 
			xaxis = T, legend = T, xlab = 'Treatment Effect', xlab.cex = 1.3,
			oma = c(4.5, 0, 2, 0), ...)

Arguments

est	A numeric vector of length 3, for coeficient estimates of the three analyses - OLS, 2SLS and EX respectively.
se	A numeric vector of length 3, for standard errors of the three analyses - OLS, 2SLS and EX respectively.
t	A number to be used to calculate individual confidence interval by 'est \pm t*se'. Default value used is 2. For different level of confidence corresponding value has to be provided.
roundto	The number of decimal digit precision.
xlims	Optional numeric array of size 2 for the plotting region of the treatment effect plotted.
ylims, ypos	Optional arguments. Can be used for plotting aeshetics.
xaxis, legend	Logical arguments for whether the treatment effect axis to be plotted and legends shown.
xlab	A logical argument or a character vecctor for the xaxis label.
xlab.cex	Size of xaxis label.
oma	Outer margin dimensions.
...	Other graphics parameters which are passed to the main plotting function.

Note

This function plots the confidence region of the treatment effect. The confidence region is calculated from the coefficient estimates and standard errors of the OLS, 2SLS and EX. This confidence region has overall level of confidence (1-α)\times 100\% when each indivual analyses are all at the same level of significance. Argument t should be used to specify the corresponding quantile.

Resultant confidence region has a four pieces: region where we have no evidence, region where only OLS shows evidence, region where OLS and one of other two etimators provides evidence, and the region where both the IV based estimators show evidence.

This plotting function creates a new plotting device for its plotting purpose.

Author(s)

Bikram Karmakar

Examples

est = c(1.6858, 2.8912, 1.1435)
se = c(0.5029, 0.9785, 0.5377)

plot_confregion(est, se, roundto = 3, ypos = .35,  xlab.cex = 1.2)

ivregEX documentation built on May 1, 2019, 10:08 p.m.