The Impact on Life Expectancy

Life Expectancy vs Climate

Earlier this week I was talking to Rebekah who mentioned that she was wondering if people in colder climates might live longer than people in warm climates. She said people in colder climates might not live as long because the colder weather might hinder immune systems during sickness. But on the other hand, those people might live longer because pathogens and microbes don’t live as long in colder climates. This got me thinking and of course, that brought on some research.

Life Expectancy Vs Temperature
Life Expectancy Vs Temperature

The initial data was collected from various sources and I found there was actually a 40% negative correlation with a state’s average temperature and their life expectancy. Removing a few of the outliers, there’s a clearer relationship as well. There is a decent amount of correlation present but I’m going to have to wait for Rebekah to work on her theory some more before I believe there’s any sort of causation between the two. We will need a way to strip some of the other variables present that have a known effect on life expectancy.

Life Expectancy vs Obesity

lifeExpectancyVsObesityMoving on from the climate I turned to something that should be much more obvious, especially after reading  a few articles. I gathered the obesity rate of individual states and then compared that to the life expectancy of each state and found a glaring trend, states with higher obesity rates have shorter life expectancies. What’s even more surprising to me is just what percentage of America is not just overweight, but obese. It’s incredible that the US has such a high standard of living and it’s self proclaimed greatest health care system but roughly 1/3 of it’s population is obese.

Obesity vs Median Income

Median Income Vs Obesity Rate
Median Income Vs Obesity Rate

There’s numerous studies that make a link between a persons income and obesity, so again we can back up these findings with our data from the state level. This isn’t exactly a perfect correlation as some of the states with around a 28% obesity level have widely varying incomes. But one thing that is clear, the most obese states have the lowest median income levels, and states that have high obesity rates have high median income levels.

Life Expectancy vs Median Income

Median Income Vs Life Expectancy

Continuing with the correlation levels, it makes complete sense that states with lower median incomes will have a lower life expectancy, and in addition an even bigger impact on it’s Human Development index.

Median Income Vs Human Development Index

On my final thoughts, kids are often the products of their parents; on how much they make, or their likelihood to be obese. There are certain genetic and medical reasons that may cause a person to be obese, but the main cause is over consumption of food and lack of exercise. For reference, in 2012, 18% of kids aged 6-11 were obese, and 21% of 12-19 year olds were obese in the US. When it’s ultimately up to the parents how much and what their children eat, perhaps there should be restrictions or incentives for parents to raise healthy children, although I’m not sure why putting their children at a greatly increased risk of health problems isn’t enough incentive.

Correlation Matrix

Correlation Matrix

Data Sources

Compiled Data – combinedData

Life Expectancy – Measure of America

Obesity Data – The State of Obesity

Median Income – KFF

Temperature – Compiled by Current Results from NOAA Data


Today I Learned – A New Section

Inspired by this post on Hacker News, I’ve decided to start my own Today I Learned, or TIL, repository. Each day I’ll be tweeting out a TIL with a short snippet of the premise and a link to the article or explanation. I don’t have any rules of what will qualify for a TIL other than being interesting and thought provoking.

My latest TIL tweets can be found on this page.


The Higher Education Bubble – An Introduction

Since the Mid-Sixties, college enrollment has tripled. We have seen a huge emergence of new tech and vocational schools as well as for-profit universities. There’s many new educational options for students who want to further their education.

Technology has evolved and entry-level jobs that require minimal skills are becoming more obsolete with every passing year. Many jobs have been replaced or are no longer needed because of automation. This has certainly contributed to the increase of students pursuing additional education. Gone are the days of only having a high school diploma and easily finding a job that pays a livable wage without performing manual labor.


College Enrollment by Year
College Enrollment by Year (1965 – 2024 projected)

While I don’t think higher education will continue to be more popular and pursued by more students, I do think the current system is currently in the later stage of a boom and bust cycle. In the last decade we saw the housing market go through a boom and bust that I firmly believe this will happen to our education system.


Tuition by Year
Average College Tuition by Year (including fees)

In the figure above there’s been huge growth in the average tuition costs and fees charged by US colleges. It’s hard to argue that this type of growth is sustainable for the long run.

Financial aid continues to be one of the biggest things that graduating students fear. There’s many reasons to fear it, if a graduate never finds a job and is unable to pay back the loans there isn’t even any sort of bankruptcy protection. The even more worrisome part is how easy it is for students to receive it. The housing market happened largely because of how easy it was for almost anyone to receive a mortgage, but it’s even easier to receive student loans. The common notion has been that there doesn’t need to be much screening since the person has already qualified by getting into a school and that they will have substantial income after graduation. We clearly haven’t learned from the Subprime Mortgage Crisis as the same issues that caused it present themselves in the current student loan situation.

It’s pretty low hanging fruit, but a very easy example that shows the issues of the student loan situation is art majors. The major is often joked to be the precursor of working at Starbucks. There are a decent amount of well paying jobs that an art major could receive after graduation, however there are far more graduates than there are jobs. The issue with this, is that every art major can get financial aid while those awarding the loans know perfectly well that it’s going to be a very low percentage of those students who will actually get an applicable job after graduation.

To put this another way, think of the student loan as an investment in the student and think of the loan issuer as the investment banker. It makes absolutely no sense for an investment banker to issue loans to every student who pursues any sort of degree. It may be a great idea to invest in a student pursuing an art degree at a highly regarded institution who has excellent grades and already has experience in the field as they will likely find a job after graduation, but it makes no sense to invest in a student with poor grades at a lousy school as the likelihood of them finding an applicable job after graduation is very low.

Total Aid by Year
College Aid Disbursed by Year

In the graph above, financial aid is mapped out by the source and then stacked to show the total amount given each year. It’s amazing how steady the graph is and then how quickly it starts to take off.

Average Aid Vs Tuition

To go further, in the graph above, average aid per student is graphed along with the average tuition per student. Here it gives a good picture of how exactly the two have gone back and forth over the years. In the past two decades, the average amount of financial aid received per student has tripled. For reference, the average inflation rate between 1990 and 2010 was about 2.75%. At that rate it’d take just over 27 years for the price of something to double. The growth of college tuition and the inflation rate are vastly different.

The only graph that shows a steady, relatively linear increase is enrollment. Higher education, or just education, has always been important and is only getting more important. With the rise of automation and machine learning, increasingly more lower level jobs are being eliminated. The days of needing unskilled labor are diminishing, especially in jobs that don’t involve manual labor. Pretty soon, nearly every job will require some sort of specialized training or education. That’s why the rise in enrollment makes complete sense.

Correlation Matrix (divided up by decade)

On the other side of this, we have the cost of higher education. It’s been skyrocketing and there has to be an end. As important as the product may be, there’s no possible way that this trend will continue. The end may not yet be in sight, but I’m confident that it’s coming.

The scarcity of the product that higher education institutions sells has greatly been diminishing with the availability of education via other sources, namely the internet. These days you can go on YouTube or a specialized learning website, such as Khan Academy, and learn just about anything. You can learn advanced calculus for free, at your own pace, without spending any money. The beauty of education is that the end product, knowledge, is just as valuable no matter where it was obtained. The only difference is whether or not a certificate or diploma is awarded which can also be valuable, there’s also the issue of indirect benefits such as the experience of college.

Besides being cheap or free, there are other benefits that the internet provides. While it still may not allow eduction to achieve perfect market efficiency, it is much closer. The biggest single reason education on the internet gets closer to this is because of it’s mobility. An astronaut could take an online class while aboard the ISS, but couldn’t attend a typical college class.

The future will be interesting. It’s harder than ever to be successful, but there’s more opportunity than ever.

Data pulled from the following sources:

Enrollment –

Financial Aid –

Visualizations –



Welcome to my website, I hope to provide a quantitative look at some of the bigger issues in society today. Too often we are presented with topics in the news without any substance behind the issue, the goal is to change that and make everyone more informed.