## social network and economics

I have been back on campus for two weeks and have been reading this book called “Connections” everyday. It’s a book that introduces the notion of social network into economics to study the transmission of information among people. Obviously, there’s a lot of annoying mathematical definitions and proofs involved, but the idea from the few chapter I have read is very interesting.

## update II

after the download of the census data. i started to deal with it to obtain certain results. first of all, the census data are divided into different areas either as countygroups or PUMA. However, i need to convert this into CZ (commuting zone) to work on further calculation. The combination of these two data sets makes it possible to calculate several variables. The number of immigrants from each nation, the number of immigrants domestically, the number of immigrants with a high school degree or under and the number of immigrants with a high school degree or under from each country are all created. These variables are calculated according to the commuting zones. With these variables, it is possible to copy the step that Smith did in his paper to further calculate the instrumental variable.

## update 1

well just remembered to start the blog updates. hope its not too late to finish the five parts. i came back to wm at the end of June to start the project with prof. McHenry about the effect of immigration on people’s decision about education. The project consists of two parts, first the census data will be used to measure the number of immigrants at each area; second part is about the analyze of nels88 data to see how people made decisions about education.

## update IV

Summer session is going to end soon but my project is still running. Last week, after all those work done about figuring out what kind of model I am going to use for my project, I finally have it written done. It’s an SEIR model with 6 patches and seasonal forcing.

## presentation at the group meeting

yesterday was our group meeting and it was my turn to present a paper. The one I talked about is” seasonality and persistence and invasion of measles” written in 2007 by Andrew Conlan and Bryan Grenfell. This paper is fairly close to my project because the data set im working on, measle reports from 60 cities in wales and england from 1944 to 1966, is also used in the paper. In addition, the CCS, critical community size, mentioned and analyzed in the paper is helpful for me to divide these data into 6 patches.