Terrace and gradient

Oct 05, 2021       2 mins     Tag: computation
I come across a paper “The Adaptive Biasing Force Method: Everything You Always Wanted To Know but Were Afraid To Ask” by Jeffrey Comer et al. When comparing the adaptive biasing force method (gradient based...
Read More

Decision theory is hard

Jun 04, 2021       4 mins     Tag: decision theory
One mental challenge is decision-making with more than two options. To simplify the dilemma that your humble author is encountering, assume that it is on a long haul flight and you are asked by a...
Read More

I passed my defense today

May 07, 2021       5 mins     Tag: zombie
I passed my thesis defense today. The capability of passing the defense per se appeared less exciting than I had imagined, in part because everyone passes the dissertation defense anyway. It is like the p-value...
Read More

Bipartisan vaccination?

Apr 17, 2021       4 mins     Tag: modeling causal
I read a NYT graph article entitled Least Vaccinated U.S. Counties Have Something in Common: Trump Voters. Apart from beautiful visualizations, their graph comparison seems persuading to draw two conclusions:
Read More

Note on "model diversity"

Apr 12, 2021       2 mins     Tag: modeling
In my previous blog post on hierarchical stacking, reader “Chaos” pointed to me Gavin Brown’s Ph.D. thesis on Negative Correlation (NC) Learning which had a good characterization of the importance of diversity to stacking or...
Read More

I failed an interview for being Bayesian

Apr 07, 2021       3 mins     Tag: zombie teaching
I get an interview feedback from a company. I initially thought my interviews went well but it turned out that the company had a different opinion. Generally, it would be silly for me to post...
Read More

Two approaches for online updates in the election forecast

Mar 03, 2021       3 mins     Tag: modeling
The term online update here is referred to updating a statistical model after certain modeled outcome is observed. A concrete example is in election forecast: the state election result comes in sequence, and that is...
Read More

Four open questions on ensemble methods

Mar 01, 2021       1 min     Tag: modeling computing
In a recent paper I wrote, I discussed a few open questions on ensemble methods: Both BMA and stacking are restricted to a linear mixture form, would it be beneficial to consider other aggregation forms...
Read More

Career development

Mar 01, 2021       3 mins     Tag: zombie
Recently I have gone through a few industry job applications. Here is a few examples that manifest how amusing this procedure can become
Read More

Best point mass approximation

Feb 20, 2021       1 mins     Tag: computation
It comes a lot that we often summarize a continuous distribution (often, posterior distribution of parameter estimation or of predictions) by a point mass (or a sharpe spike) for (1) computation or memory cost, (2)...
Read More