time series

111 posts
What does Elon Musk do every day?

The Wall Street Journal published a fun little piece about tweets by Elon Musk (link). Here is an overview of every tweet he sent since he started using Twitter more than a decade ago. Apparently, he sent at least one tweet almost every day for the last four years. In addition, his tweets appear at all hours of the day. (Presumably, he is not the only one tweeting from his...

0 0
Selecting the right analysis plan is the first step to good dataviz

It's a new term, and my friend Ray Vella shared some student projects from his NYU class on infographics. There's always something to learn from these projects. The starting point is a chart published in the Economist a few years ago. This is a challenging chart to read. To save you the time, the following key points are pertinent: a) income inequality is measured by the disparity between regional averagesb)...

0 0
Deficient deficit depiction

A twitter user alerted me to this chart put out by the Biden adminstration trumpeting a reduction in the budget deficit from 2020 to 2021: This column chart embodies a form that is popular in many presentations, including in scientific journals. It's deficient in so many ways it's a marvel how it continues to live. There are just two numbers: -3132 and -2772. Their difference is $360 billion, which is...

0 0
Superb tile map offering multiple avenues for exploration

Here's a beauty by WSJ Graphics: The article is here. This data graphic illustrates the power of the visual medium. The underlying dataset is complex: power production by type of source by state by month by year. That's more than 90,000 numbers. They all reside on this graphic. Readers amazingly make sense of all these numbers without much effort. It starts with the summary chart on top. The designer made...

0 0
Funnel is just for fun

This is part 2 of a review of a recent video released by NASA. Part 1 is here. The NASA video that starts with the spiral chart showing changes in average global temperature takes a long time (about 1 minute) to run through 14 decades of data, and for those who are patient, the chart then undergoes a dramatic transformation. With a sleight of hand, the chart went from a...

0 0
What do I think about spirals?

A twitter user asked how I feel about this latest effort (from NASA) to illustrate global warming. To see the entire video, go to their website. This video hides the lede so be patient or jump ahead to 0:56 and watch till the end. Let's first describe what we are seeing. The dataset consists of monthly average global temperature "anomalies" from 1880 to 2021 - an "anomaly" is the deviation...

0 0
Dots, lines, and 2D histograms

Daniel Z. tweeted about my post from last week. In particular, he took a deeper look at the chart of energy demand that put all hourly data onto the same plot, originally published at the StackOverflow blog: I noted that this is not a great chart particularly since what catches our eyes are not the key features of the underlying data. Daniel made a clearly better chart: This is a...

0 0
The what of visualization, beyond the how

A long-time reader sent me the following chart from a Nature article, pointing out that it is rather worthless. The simple bar chart plots the number of downloads, organized by country, from the website called Sci-Hub, which I've just learned is where one can download scientific articles for free - working around the exorbitant paywalls of scientific journals. The bar chart is a good example of a Type D chart...

0 0
The envelope of one’s data

This post is the second post in response to a blog post at StackOverflow (link) in which the author discusses the "harm" of "aggregating away the signal" in your dataset. The first post appears on my book blog earlier this week (link). One stop in their exploratory data analysis journey was the following chart: This chart plots all the raw data, all 8,760 values of electricity consumption in California in...

0 0
Best chart I have seen this year

Marvelling at this chart:   *** The credit ultimately goes to a Reddit user (account deleted). I first saw it in this nice piece of data journalism by my friends at System 2 (link). They linked to Visual Capitalism (link). There are so many things on this one chart that makes me smile. The animation. The message of the story is aging population. Average age is moving up. This uptrend...

0 0