Andrew Lehm

Andrew joined The Data School from a background in Biomedical Science and Emergency Medicine.

Having utilised data analytics in his studies, he enjoyed the practice of distilling complex information into a digestible format, and often leveraged visuals for information transfer. A growing awareness of the widespread misuse of statistical analyses within the scientific community fostered a deeper interest in data analysis best practices, which led him to the field of data visualisation consulting.

Intrigued by the The Data School’s heavy emphasis on storytelling, Andrew applied; through the application process he became a habitual Tableau user. He places an emphasis on minimalist design.

Beyond data, Andrew is passionate about healthcare and medical ethics.

Blog Posts

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Thu 31 Jan 2019 | Andrew Lehm
Tableau: proportional brushing with set actions
Set actions have been out for a while now but one of my favourite uses (and probably the easiest to pick up) is proportional brushing
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Fri 28 Dec 2018 | Andrew Lehm
Tableau: Creating a customer drop-off tracker
Tracking the rate of your customers’ orders so that you can react if a customer appears to be dropping off A few weeks ago I built a rudimentary customer drop off tracker for a client project and I thought I’d share the technique
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Fri 28 Dec 2018 | Andrew Lehm
Alteryx stats tools for beginners: part 5 - Time series analysis
Alteryx stats tools for beginners This is part three of a five part series introducing the stats tools available in Alteryx explaining the tools and indicating when their use is appropriate. 1. Clustering [https://www.thedataschool.co
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Fri 28 Dec 2018 | Andrew Lehm
Alteryx stats tools for beginners: part 4 - Classification
Alteryx stats tools for beginners This is part four of a five part series introducing the stats tools available in Alteryx explaining the tools and indicating when their use is appropriate. 1. Clustering [https://www.thedataschool.co
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Thu 27 Dec 2018 | Andrew Lehm
Alteryx stats tools for beginners: part 3 - Regression analysis
Alteryx stats tools for beginners This is part three of a five part series introducing the stats tools available in Alteryx explaining the tools and indicating when their use is appropriate. 1. Clustering [https://www.thedataschool.co
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Thu 20 Dec 2018 | Andrew Lehm
Dashboard Week Day #4
Today Andy set us the task of visualising some data about bike traffic around Seattle. The data comes from about 13 spots around the city where bike traffic is measured. I had a clear idea of what I wanted to achieve in the day
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Wed 19 Dec 2018 | Andrew Lehm
A short introduction to Microsoft's Power BI
Here at the Data school we are habitual Tableau users; hardly a day goes by, including weekends, without opening Tableau at least once, even if only to make a minor tweak or two
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Tue 18 Dec 2018 | Andrew Lehm
Dashboard Week Day #2
For day 2 of dashboard week we have been looking at metadata around body mounted camera usage by police officers in New Orleans. The data contains the locations, times and duration of the creation of footage
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Mon 17 Dec 2018 | Andrew Lehm
Dashboard Week Day #1
Today’s task was to download New York snow plow data but it was us that got plowed. We were advised to download the data and upload it to Exasol, a columnar storage database which is super fast in Tableau for large data sets
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Fri 30 Nov 2018 | Andrew Lehm
Alteryx stats tools for beginners: part 2 - Data investigation
Alteryx stats tools for beginners This is part two of a five part series introducing the stats tools available in Alteryx explaining the tools and indicating when their use is appropriate. 1. Clustering [https://www.thedataschool.co
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Wed 21 Nov 2018 | Andrew Lehm
Alteryx stats tool for beginners: part 1 - Clustering
Alteryx stats tools for beginners This will be a five part blog series providing an introduction to the Alteryx stats tools available; it is aimed at people new to statistical analysis and/or Alteryx and will give explanations of the tools and when it is appropriate to use them. 1. Clustering 2
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Sun 11 Nov 2018 | Andrew Lehm
Using calculated fields to create dynamic tooltips in Tableau
This weekend I went back to some previous makeover Monday data to have a play with on a train journey. I created a fairly simple viz to show the proportion of seats held by women in the House of Representatives over time, split by party affiliation
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Thu 25 Oct 2018 | Andrew Lehm
5 ways for visualising a change between two distinct time points
There are many ways to visualise change in a measure over time, but fewer make sense when you have just two time points to compare. Let’s take a look at a handful of options. 1
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Mon 22 Oct 2018 | Andrew Lehm
Heat maps, heat-maps and heatmaps????
Google “heat map” and you will come across a number of drastically different charts. I have a slap around the ears fromBeth [https://www.thedataschool.co
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Thu 18 Oct 2018 | Andrew Lehm
Parameters: dynamically change the dimensions in your view and sort by multiple measures
This post will show you how to create parameters to dynamically alter what is contained within your view, and even to sort by measures that don’t even have to be displayed
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Tue 16 Oct 2018 | Andrew Lehm
Creating a thermometer chart in Tableau - a nice way to visualise progress towards a goal
A neat alternative to the bullet chart is to create a thermometer chart to measure your progress towards a goal. I’ve created mine from sample data comparing profit to overall sales, but this can be done with any data you like
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Thu 11 Oct 2018 | Andrew Lehm
Alteryx: an introduction to parsing
Parsing: in essence, breaking down a structure into its constituent syntactical parts to analyse individually. Today Mina walked us through one of her parsing challenges. Alteryx is a lot easier to tackle when someone is guiding you through so maybe this can be of help to others as well
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Tue 09 Oct 2018 | Andrew Lehm
Alteryx: splitting hairs (strings)
Tom and I had our first experience with Alteryx today and our afternoon task was to tidy up some data gleaned from seafood recipes online. You can see how Tom tackled the task of converting the time data from string to numerical here [https://www.thedataschool.co
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Tue 09 Oct 2018 | Andrew Lehm
How to create a stacked bar chart from multiple fields
Having spent my second day at the data school getting introduced to Alteryx (and banging my head against the wall), after two hours we had finally cleaned up some data (on popular seafood recipes) and loaded it into Tableau. You can see how Tom and I prepped the data here [https://www
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