HOMEWORK: (click here for comments / solutions to the HW)
Please read materials before each class. Below is a tentative reading list / homework assignments. It is subject to changes depending on the amount of material covered each week, who is available when, how events evolve.
HW 1: Math 312: Due 9/14/20
Suppose
(1) there is a fixed probability p of contracting the virus each day,
(2) you can only contract the virus once, and
(3) on a given day N, you do not know if you have already contracted it before day N. (Asymptomatic carrier)
Across values of p, what is the highest the probability can be of contracting the virus on day N?
HW 2: Due 10/2/20: Due the problems at the end of the slides from Friday 9/25 (slides here); there is one problem for Math 119, and 4 problems for Math 312.
HW 3: Due Monday October 12, 2020: Keep working on your topics. Remember to look at fitbit or email or tweat data over different timeframes to see how things fluctuate (does not need to be submitted).
(1) Math 119 and Math 312: Look at the final regular season standings in the American League East. For each team, find the exponent c such that RS^c / (RS^c + RA^c) equals the observed team's winning percentage. Show how this value varies among the teams; is it close to 1.8? Redo this for the final regular season standings for the American League East in 2019. Which year do you expect a "better" fit, and why?
(2) Math 119 and Math 312: Assume runs scored and allowed are discrete integer random variables. The model in class assumed these are independent; come up with a situation where you do not expect these to be independent, and discuss what term you might add to the runs scored / runs allowed variables to account for this interaction.
(3) Math 312: The Weibulls were chosen because we can easily integrate the product of two in the region 0 <= y <= x. Fin another choice for the density function where you can do this; note you cannot choose a Weibull or a sum of Weibulls.
(4) Math 312: We used properties of the Gamma function, defined by \(\Gamma(s) = \int_{x = 0}^{\infty} e^{-x} x^{s-1} dx\), where \({\rm Re}(s) > 0\). (a) Prove the integral converges for \({\rm Re}(s) > 0\). (b) Prove \(\Gamma(s+1) = s \Gamma(s)\), prove \(\Gamma(n+1) = n!\) whenever \(n\) is a non-negative integer. (c) Approximate \(\Gamma(1/n)\) when \(n\) is very very large (write it as a main term and something that goes to zero with \(n\)).
HW 4: Due Friday, October 16 by 11:59pm (submit via glow): Notes on the method of least squares here. Problem (3) is worrth 20 pointes, rest 10.
Math 119 and Math 312: (1) Do Exercise 3.9 from the method of least squares handout (https://web.williams.edu/Mathematics/sjmiller/public_html/341Fa19/handouts/MethodLeastSquares.pdf).
Math 119: (2) Do Exercise 3.3 from the method of least squares handout.
Math 312: (2) Do Exercise 3.4 from the method of least squares handout.
Math 119 and 312: (3) Gather data about something related to covid where you have one input variable, x, and one output variable, y. See if your data supports a linear relationship (y = a x + b) or perhaps a linear relationship after applying logarithms (log y = a log x + b). The data can be anything you want; when you submit your homework include your data set (if the data is not that extensive you can include taht in your write-up). Note many relationships just won't be linear (maybe x is the year a state entered the union and y is its population today), though there could be some trends.
Math 312: (4) Do Exercise 3.6 from the method of least squares handout.
HW 5: Due Friday, October 23 by 11:59pm (submit via glow):
Math 119: (1) Use Divide and Conquer to estimate the square-root of 5 to at least three decimal digits. Then use Newton's method and do four iterations.
Math 119: (2) Use Divide and Conquer to estimate \((1 + \sqrt{5})/2\), the golden mean, to at least three decimal digits. Then use Newton's method and do four iterations.
Math 312: (1) Use Divide and Conquer to estimate \((1 + \sqrt{5})/2\), the golden mean, to at least three decimal digits. Then use Newton's method and do four iterations.
Math 312: (2) Find a formula to estimate the cube-root of a positive integer, and then use that (four iterations) to estimate the cube-root of 2.
Math 312: (3, 4, 5): Do the following problems from Rudin's Principles of Mathematical Analysis (Chapter 3, Problems 3.16, 3.17 and 3.18; if most of my stuff wasn't in storage b/c of the new building I would share my solutions from my sophomore year...).
HW 6: Due Wednesday November 4th by 5pm US Eastern: Send an at most one
paragraph comment on https://youtu.be/q2ZdfqtnpJc on Nonpharmaceutical
Interventions. This is worth 30/30, you will receive full credit for doing.
Please do NOT send it as an attachment, include the paragraph as text in
your email. NOTE: If you do not include your section (119 or 312) you will
receive no credit.
The Mathematics of Pandemics: From the Spread of Infections to Cost-Benefit Analyses of Responses (tentatively Math 119/312, offering at two different levels)
Steven Miller: sjm1@williams.edu
Tentative Schedule (~33 classes), highlighted in blue are tentative.
Introduction to the class and previous pandemics throughout history.
Syllabus
At what point in human history did disease become a major concern? When humans shifted to agrarian lifestyles 10,000 years ago, putting humans into closer contact with each other.
The origins of diseases, how they spread to become pandemics, what the responses were and the long term effects: Leprosy, the Black Plague, smallpox (spread to the Americas via the Columbian Exchange), Cholera (the first global pandemic?), the Spanish Flu, HIV/AIDS, SARS, Ebola, and now COVID-19.
Simple Mathematical Systems
Bacteria growth and rabbits.
Introduction/review of Statistics
Means, standard deviations, central limit theorem, confidence intervals, and hypothesis testing.
Issues with statistics: shoe size/spelling example.
Example: Won three of last four….
What is the right statistic: The notion of a mean
Advanced Mathematical Systems
Solving differential equations and models for infections.
Advanced Mathematical Systems 2
Solving different kinds of differential equations.Introduction to Measurement
What are we measuring and why? Why do we choose some quantities over others?
“Flattening the Curve”
What does it really mean? Where did the curve come from? What model was used to make this assumption/prediction?
Was the U.S. able to achieve it? What part of the curve are we on right now?
Introduction to Chaos and Parameter Sensitivity
The notion of chaos in modeling weather and finding roots of polynomials.
How climate change models can produce very different predictions based on small changes in input parameters.
Biology speaker to talk about disease and models.
Discussion: Individuals vs. the State
Where is the line between individuals’ rights and the power of the state to force its citizens to take certain actions?
Possible topics: free speech, abortion, genetic engineering, gun control, seat bels and motorcycle helmets and bakeries.
At what level of government should policy (and restriction) be set: federal, state or city/local?
Have a philosophy professor come in to talk about individuality vs. public good and facilitate a discussion with the class
Have someone from law discuss (COULD BE WHAT I LISTED AS ‘C’ ABOVE...OR SOME COMBO OR B AND C)
Midterm I Placeholder (if we have a midterm -- likely we will be doing papers)
COVID-19 and the economy.
The impacts that COVID-19 has had on the economy due to lockdowns and social distancing.
The idea of unemployment in economics: structural and cyclical unemployment. What type was caused by COVID-19?
Comparison of current unemployment levels to those of the Great Depression. What can we expect to see in the global economy in the coming years?
The economics of working from home: Are there any productivity boosts/decreases? Is working from home lowering costs? Which industries can work from home and which can’t? How does that impact wealth distribution?
Economics speaker
Highlight the impacts of covid globally, as well.
Contrast the varied policy decisions made around the world and how they have worked out to date.
Implications on a macro and micro level.
COVID-19 and the Media
How does the media influence how we perceive the pandemic? How does the media shape discussions around it?
The media as gatekeepers of what the public gets to know regarding the pandemic.
Journalist Speaker I’D COMBINE 15 AND 16 USING THE SPEAKER OR TWO PJ
What are they reporting and why? Does bias influence the coverage?
Medical frontline worker speaker
How has healthcare changed in the face of COVID-19?
What is it like to be in the frontlines of covid?
What medical conditions have not been treated, or have been under-treated, during the focus on COVID-19 cases?
What kinds of lasting impacts will COVID-19 have on the healthcare industry? How will we prepare for a future pandemic? MIGHT CONSIDER A PUBLIC HEALTH OFFICIAL, AS WELL--DIFFERENT FROM A FRONTLINE WORKER
Introduction/review of cost-benefit analyses.
How do we quantify benefits and costs into a number? How do we make sure all benefits and costs are accounted for? How do we quantify moral concerns?
How do we maximize benefit and minimize cost? How can we do such an analysis objectively?
How do we decide how many deaths are “acceptable.”
Midterm II Placeholder (?)
Establishing COVID-19 Baselines
What was the state of the world pre-COVID-19?
What are parameters/response variables we are interested in studying for comparison of pre and post COVID-19?
Is it practical to study these parameters? Will we be able to get accurate data for these parameters?
The short term effects of COVID-19.
Deaths and infections. Change in mortality rate?
The long term effects of COVID-19 and the effects of policies resulting from COVID-19.
Also, long-term psychological effects?
Agendas and Hindsight (speaker?)
In hindsight, we can analyze the actions taken and whether or not they were appropriate?
Can you detect the agendas of people who pushed for various responses to the pandemic?
Expanding on the notion of “acceptable losses,” how do we make the hard decisions, especially considering people who are at a higher risk from the virus, such as those who are older or immuno-compromised.
Effects of Lockdowns
Did they work? How many lives did they save? Were they worth the widespread job loss? What have been the costs and benefits?
Are lockdowns constitutional? Do they infringe on the rights of citizens?
The case study of masks: How and why did recommendations relating to them evolve? Is being required to wear a mask an infringement on personal liberties? Why are some unwilling to wear it? Were U.S. residents far more resistant than their counterparts in other countries?
Contact Tracing: Cost-Benefit Analysis
Cost: people lose a degree of privacy as the government tracks where every single person goes on a daily basis.
Benefit: Reduces the spread of the virus.
How to quantify these costs and benefits?
South Korea’s contact tracing.
Educational Institutions
Costs and benefits of an educational institution being open vs. offering online classes. Is the situation different for high school vs. college level education?
In hindsight, should colleges have closed campuses in March?
Comparison of different policies taken by countries worldwide
Costs and Benefits of each approach.
China, Italy, Sweden, Brazil, U.S.
Political Science Speaker
Global implications of our response and the new normal.
China relations: the conspiracy theory that covid was man-made in a lab in China. AGAIN, SEE MY MEMO TO COME, pl
The political realities and how things are done.
Personal Responses to COVID-19
If I am a doctor/nurse, should I continue working without hazard pay? Am I morally obligated to do so?
Is it okay for me to continue going outside? Maintaining in-person social relationships?
Who did we decide were essential workers and what were the pressures on them? Ex. food delivery services, meatpacking plants
Cost-benefit analyses on a personal level.
Midterm III Placeholder (?)
Presentations
Presentations
Presentations