Friday, July 13, 2018

Geek Jokes Galore

In case you don't already play along, every Friday I post a #GeekJoke on Twitter (@DataGeekB)

Over the years we've had demographer jokes, statistician jokes, economist jokes, mathematician jokes, and more. Here are a few of my favorites:

A demographer is just a mathematician broken down by age and sex.

I just saw my colleague with a piece of graph paper.
I think she must be plotting something.

Why do teenagers travel in groups of 3 or 5?
Because they can't even...

Did you hear about the mathematician who’s afraid of negative numbers?
She'll stop at nothing to avoid them...

First day on the job, a boss warns her new employee to avoid the statisticians in the cafeteria: "They're just mean."

To women who ask: "Should I continue to have kids after 35?"
Me: "I don't want to tell you how to live your life, but 35 is a lot of kids."

2 mutually exclusive categories went on a date.
It didn't work out.
They had nothing in common.

Biologist, Demographer & Mathematician sit at a cafe. Across the street they see a man and a woman enter a building. Later those two people reappear with a 3rd person. 
They multiplied! says the Biologist
It's an error in measurement! says the Demographer.
If 1 person enters the building now, it will be empty again, concludes the Mathematician.

There's a fine line between a numerator and a denominator...

An economist thinks that her equations are an approximation to reality.
A physicist thinks reality is an approximation to her equations.
A mathematician doesn't care.

If you live to be 100, you've got it made.
Very few people die past that age.

A farmer counted 297 cows in the field.
But when he rounded them up, he had 300.

Why do teenagers travel in groups of 3 or 5?
Because they can't even...

I made a chart of past relationships.
It has an ex axis and a why axis.

And a couple of geeky riddles:

What always goes up, never goes down?
Your age.

When your code won't run, what can you still count on?
Your fingers.

2 mothers & 2 daughters sat down to breakfast. They had 3 cups of coffee. Each person had exactly 1 cup of coffee.
How is that possible?
(Hint: If you've worked w complex household structure data, you'll figure this one out)

Thursday, May 17, 2018

2017 births: lowest teen and young adult birth rate on record, rising rates at older ages

Highlights from the preliminary 2017 birth data

Birth rates for U.S. teens and early 20-something are at (another!) all-time low, and birth rates continue to rise at ages 40 and older.

Another important milestone is that, for the first time on record (2016), birth rates for ages 30-34 exceeded the rate for ages 25-29.

As a historical demographer, who has some experience with fertility and mortality rate trends over the past century (and the century before), and I can say with conviction that the trend toward higher birth rates at ages 30+ is not really new. Birth rates for women ages 35 and older are not higher now than ever. (They're not even higher now than they were in the 1950s and 1960s.) I would argue that, rising birth rates among those in their 30s and 40s is more a return to long-run historical norms than an aberration. (First births at older ages is a newer phenomenon, the rate at older ages is nothing new.)

The National Vital Statistics Reports, published by the U.S. Centers for Disease Control and Prevention, provide historical birth rate data by age of mother as far back as 1970. Earlier years are available, but must be compiled from a variety of other sources including the older, and often PDF-scan-only Monthly Vital Statistics Reports and the U.S. Statistical Abstract. From those sources I collected data as far back as 1920, with complete annual data from 1935-present. The historical birth rates (births per 1,000 women) are shown in the chart above.

I am happy to share the raw data upon request. Feel free to contact me for more information.