# 2.5 Replication of econometric studies  (Page 2/10)

 Page 2 / 10

## Butler, finegan, and siefried (1998).

The obvious first step is to find and print a copy of the article by Butler, Finegan, and Siefried. In fact, do not proceed any further in reading this module until you have read the article. We will discuss in class what the authors do in the paper and how clearly they present their conclusions. In this first pass at the article you are to pay attention to how convincing you find their arguments to be. Since everyone in the class has completed an intermediate microeconomics course, your discussion of their conclusions should reflect your own experiences. Also, you need to be able to discuss in class the estimation strategy they use in the paper. In particular, you will need to be able to identify what the source of the data is and what equations did they estimate. Also, try to determine how the estimations in the "first" stage are used in the estimations of the "second" stage. Why did the authors use a two-stage estimation strategy?

Also, what do you think the authors mean in their description of their estimation strategy by their statement about the estimation methods they use:

Estimation Methods and Expectations
To cope with the selection bias problem, we use a two-stage estimation procedure. The first stage employs an ordered probit model to predict the highest level of calculus attained by each student prior to taking each intermediate economic theory course.... In the second stage, the student's grade in MICRO-2 ... (the `outcome') is regressed on the actual level of calculus attained, the grade earned in that calculus course, the predicted residual in the grade equation that we would expect on the basis of the actual level of calculus attained, and a roster of control variables reflecting ability and motivation. Individuals are the unit of observation. Ordinary least squares estimation is used because there are twelve categories of grades which are commonly interpreted as cardinal measures of performance (as is implied by the calculation of `grade point averages'). (Butler, Finegan, and Siegfried, 1998: 188)

## The ordered-probit model

In what follows you are to “replicate” the equations the authors estimate in the paper for the intermediate microeconomics course. In order to complete this assignment you will need to figure out several things including (1) what an ordered-probit model is and (2) how to use Stata to estimate an ordered-probit model. In this section of the module we introduce the ordered-probit model. I strongly encourage you to consult Greene (1990: 703-706) for an excellent and clear discussion of the ordered-probit model. The discussion here follows Greene closely.

It is common for surveys to have questions that require the responder to choose one of several categories that have an innate order to them. For instance, most course evaluations ask the respondent to choose an answer to a question that reflects their agreement with a statement about the course. For instance, the question might read, "The Professor was interested in the material taught in the class" where the student completing the evaluation would choose a number from 1 to 9 where a 1 indicates complete disagreement with the statement and a 9 reflects complete agreement with the statement. Thus, there is an order to the potential answers. Using a logit, probit, or multilogit model would completely ignore this order. A linear regression is inappropriate because OLS treats the difference between answers of 1 and 2 as being the same as the difference between a 7 and and 8, when in fact the numbers only provide a ranking.

where we get a research paper on Nano chemistry....?
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
what about nanotechnology for water purification
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
why we need to study biomolecules, molecular biology in nanotechnology?
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
why?
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
Got questions? Join the online conversation and get instant answers!