Ok, waterfall charts are real. And useful. They don’t actually involve falling water in any capacity, but they do show the cumulative effect of a series of positive and/or negative values on an initial starting value.
The following waterfall chart shows the headcount changes for a department, visually depicting the cumulative effect of the additions and deletions to the start value:
It shows the number of staff in our department at the start of the year (left grey bar), the number of people added from other departments or as new hires (green bars), the number of people who left (red bars) and finally the balance which is the headcount at the end of the year (right grey bar).
The waterfall chart above is relatively easy to create in Google Sheets but does still require some data wrangling to set it up. Notice that all of the bars are above the x-axis (Case 1), which makes the data set up vastly simpler than the case when we have a mix of bars above and below the x-axis, or spanning the x-axis (see Case 2 below).
I’ll show you how to create both of these cases, starting with the easier, positive-bar case.
After creating the simple and complex versions manually with formulas, I’ll show you some Apps Script code to automate the majority of the process and massively speed up creating complex waterfall charts.
I love animated charts where the animation is central to the storytelling; where it adds value, rather than being simply fancy decoration.
When it’s done well, it can be extremely powerful, mesmerizing and compelling.
One of the best examples I’ve seen is Bloomberg’s animated temperature visualization. I love how powerfully this chart conveys its message, and I’ve been semi-obsessed with it ever since I saw it.
So, over the past few weeks and since my last experiment with the Google Visualization API, I’ve been chipping away at this project to create an animated temperature chart within the Google environment. It’s finally in a state I can share here, however it’s what you might call an MVP still…
Here’s my animated temperature chart built with the Google Visualization API connecting to Washington D.C. data in a Google Sheet:
You can see this animated chart in all its glory here.
My Twitter feed is mostly populated with data-related resources and people, so I almost always find something new and shiny going on there to distract me.
Sometimes this can be a good thing though (and sometimes, it can be the best thing ever).
Take last Friday. I found myself procrastinating, browsing my home feed when I saw this tweet for the upcoming Microsoft Data Science summit:
What caught my eye was not the actual tweet, but the sumptuous weather visualization that I recognized as one of Edward Tufte’s famous creations.
I clicked through to the article, which linked to Tufte’s original chart (here) and a fantastic tutorial about re-creating the chart using R, from Brad Boehmke (which is actually the chart shown in the tweet above).
It looks at daily average temperature over a period of time and captures the historic min/max range, the normal range (95% confidence interval), the 2014 temperature line and picks out the highs and lows. It renders all of this information in a single, beautiful column/line combination chart.
Curiousity piqued, I wondered whether this would be possible with Google Sheets?
Ever find yourself needing to repeat an action in your Google Sheets?
For example, on a recent client project I wanted to cycle through my spreadsheet data, compare it to another dataset and apply a matching algorithm. To do this and stay within the 6 minute execution limit for Apps Script, I split my data into “blocks” of 10 rows, counted how many blocks I had and then ran the matching algorithm once for each block until they’d all been processed.
By adding time-based triggers, I setup my Google sheet to do this automatically, rather than having me click a button each time.
In this post I’m going to show a skeleton example of this time-based architecture, to which you can add your own functionality.
The entire code file is here on GitHub and the spreadsheet is available here (feel free to make a copy: File > Make a copy… and then you can open the script editor to modify the code).
Time-based triggers with Google Apps Script
In this simple example, I’m going to output a random number in a new line of my spreadsheet every minute until I’ve looped through a set number of times (2 in this case). It’s deliberately basic as the focus is on the trigger/timing architecture.
Here’s a screencast of this simple program in action (speeded up):
Behind the scenes, everything is running on autopilot once I’ve clicked that first Run button.
Here’s a collection of resources for you: a strange mix of advanced, esoteric and inspirational spreadsheet uses, showing how far some (mad)men and women push their spreadsheets. The list gets more light-hearted towards the bottom of the post!
Somehow I doubt Dan Bricklin would have envisioned all this when he invented the spreadsheet…
Functional programming in Excel from Felienne Hermans all about her research into treating Excel as programming language. Well worth a watch.
Google launched a new business intelligence tool called Data Studio in May 2016. It’s a really smart reporting tool for quickly creating powerful, stunning dashboards from multiple Google data sources.
It’s a great option for small/medium businesses already using Google tools, who want to build bespoke dashboards for that 40,000ft view of their business.
Google Data Studio Example Reports
Here are two example reports for a mid-size website (~500k pageviews a month).
Regular readers will know of my enthusiasm for building dashboards, especially using Google apps (like this one or this how-to article).
So I was super excited in May of this year when Google launched Data Studio, a free data visualization and dashboard tool to compete against incumbent dashboard vendors Microsoft PowerBI, Tableau and Qlickview.
Here, I’m excited to share my initial impressions and show you some of the basics steps to build dashboard reports using this tool.