Directed acyclic graph Assignments

Directed acyclic graph Assignments

Directed acyclic graph Assignments

In your own words, explain why an “intent to treat analysis” is critical to ensure that an
experiment functions properly. Draw a DAG of an experiment and explain why this DAG
supports your answer. Just use letters when drawing your DAG—no specific example is
required.
(2) Watch this trailer for the 2010 documentary “Waiting for Superman” on YouTube:
https://www.youtube.com/watch?v=yFN0nf6Hqk0. Researchers who are interested in
testing whether charter schools do a better job of educating students than non-charter
schools have long worried that the reason we might see better academic achievement
from students in charter schools is actually because more privileged students are the
ones who apply to charter schools in the first place.

 

Draw a DAG illustrating the reason for the researcher’s concern

 

Directed acyclic graph Assignments

B. Some researchers have dealt with this problem by only studying charter schools
that accept students via a lottery (random) process such as the one shown in the
video clip. They compare students who got into the school via the lottery process
to those who lost the lottery process. The lottery is run by the schools. The
classes are also designed and delivered by the teachers and school district. Is
SOC 311
Winter 2022
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this study designed closest to a “true” experiment, a natural experiment, or a quasi-experiment? Briefly explain why you chose your answer.
C. Why does the lottery process (mostly) solve the problem that the researchers are
concerned about?
(3) Copied here is part of an article by Gary J. Gates and Frank Newport published on Oct
18, 2012 by Gallup (for full article see: http://www.gallup.com/poll/158066/special-reportadults-identify-lgbt.aspx ). Read this paragraph from the article and then answer the
questions about it.

 

 Directed acyclic graph Assignments: Homework #5 Experiments and Surveys

 

Directed acyclic graph Assignments

“The inaugural results of a new Gallup question — posed to more than 120,000 U.S.
adults thus far — shows that 3.4% say “yes” when asked if they identify as lesbian, gay,
bisexual, or transgender. These results are based on responses to the question, “Do
you, personally, identify as lesbian, gay, bisexual, or transgender?” included in 121,290
Gallup Daily tracking interviews conducted between June 1 and Sept. 30, 2012. This is
the largest single study of the distribution of the lesbian, gay, bisexual, and
transgender (LGBT) population in the U.S. on record.”
A. Of the three goals a study might have—exploratory, descriptive, or explanatory—
what do you think was the goal of this particular survey question? Why do you
think this?
B. Their estimate of the population parameter may not be perfectly accurate. If so,
do you think that their estimate would be an over-estimate or an under-estimate
of the truth?
C. Give TWO reasons to support your choice of response in Part B. (Hint: Note that
this question is not asking you to comment on the sampling strategy or study
design used by the researchers. Instead, think about how things like the wording
of the question might have affected respondents’ likelihood to answer “yes” or
“no.”)