Estimate the treatment on the treated

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Reference no: EM131095939

Econometrics 718 - Optional Problem Set

Problem 1- Lets think about the propensity score. What we showed in class is that the distribution of X_iis identical for the treatments and non-treatments when we control for the propensity score. Let's show that. Let's suppose that this is the distribution of (X_1i, X_2i, T_i) in the population

X_1i	X_2i	T_i	Prob.
0	0	0	0.10
0	0	1	0.10
0	1	0	0.10
0	1	1	0.20
1	0	0	0.05
1	0	1	0.10
1	1	0	0.10
1	1	1	0.25

That is Prob. is the probability of that particular outcome. Notice the probabilities add up to one.

1. Calculate the propensity score for each of the four different combinations of X_1i and X_2i

2. Calculate

(a) The distribution of (X_1i, X_2i) conditional on the propensity score is 2/3 and T_i = 1

(b) The distribution of (X_1i, X_2i) conditional on the propensity score is 2/3 and T_i = 0

Problem 2 - Use the stata data jtrain2.dta that you can get from https://www.stata.com/texts/eacsap/. The treatment here is "train" and we will estimate the effect of the treatment on the treated in a number of different ways. The dependent variable will be re78 (real earnings in 1978). Let's first only control for black and hispanic, so there are three categories black, hispanic, and non-black non-hispanic.

a) Tabulate the 6 cell means by race and by training status. That is the mean for black trainees, etc. Also what are the proportions of the three groups by training status?

b) Use the 12 numbers from part a) to calculate an estimate of the treatment on the treated.

c) Use regression analysis with dummy variables to estimate the treatment on the treated.

d) Now use propensity score matching. Stata 13 does this with the package teffects psmatch.

e) Estimate the TT parameter using reweighting.

Problem 3 - Now pick some other data set and choose a treatment variable. Continue to estimate the treatment on the treated.

a) Estimate using linear regression.

b) Try doing by propensity score matching in 4 different ways (any variations you choose).

c) Estimate by reweighting.

Reference no: EM131095939

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