All entries for August 2006

August 31, 2006

What to do tomorrow

1) check why using “cond()” rather than “replace” leads to better rate of convergence.
2) check whether we made any mistake translating code from intreg to our gmm code. (especially the cond() thing)
3) if “cond()” is better than use it instead of “replace”
4) Is code for b/sigma correct? that is, the “cond()” and “replace” thingy.

August 09, 2006

Simulation 2

Today I tried to change the moment conditions for the intercept, coefficient and for sigma. I hope that, with modifications, the code might work better. Instead of writting two lines of codes for r = 1 and r = 0, I combine them together using (1–r) and (r). However, this does not change the results.

August 08, 2006

Simulation 1

Today, I compared two simulation studies; 40 replications, discrete missing mechanism, but one study uses bb–parameters whereas the other uses bs parameters. It seems that the study with bb–parameters is better. This result againsts the original result from LFS data. There, I concluded that bs–parameter is better.

August 07, 2006

The Beginning of The End

(1) Time Line
August : Simulations, Learn Matlab, Chapter 1?
September: Moving out of the office

There are about 8 months left before April!!

What have to be done:
– Simulation Studies ( a lot)
– finish First Chapter with Richard (difficult)
– Tang Little and Rubin's estimator
– Bounds
– Maximum Score for IPW


Today, I tried to fix the simulation's programme by changing the "genr"; that is, use the discrete missing–mechanism. However, this does not help the problem. The convergence rate is still poor. why?

August 2006

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