If you don’t pay attention, data can drive you off a cliff

All common sense, but as with many things, having it written down focusses the mind 🙂

Yanir Seroussi

You’re a hotshot manager. You love your dashboards and you keep your finger on the beating pulse of the business. You take pride in using data to drive your decisions rather than shooting from the hip like one of those old-school 1950s bosses. This is the 21st century, and data is king. You even hired a sexy statistician or data scientist, though you don’t really understand what they do. Never mind, you can proudly tell all your friends that you are leading a modern data-driven team. Nothing can go wrong, right? Incorrect. If you don’t pay attention, data can drive you off a cliff. This article discusses seven of the ways this can happen. Read on to ensure it doesn’t happen to you.

1. Pretending uncertainty doesn’t exist

Standard deviation diagramSource: Standard error, Wikipedia

Last month, your favourite metric was 5.2%. This month, it’s 5.5%. Looks like things are getting better…

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Are you writing legacy CSS code? | Tinned Fruit

Most articles about CSS refactoring focus on specific refactoring techniques. They rarely even mention testing as a safety net for changes. Those that do describe ad-hoc manual testing or visual regression testing using image diff tools such as Wraith, PhantomCSS or BackstopJS. These tools take a little setting up, but they can quickly tell you if a page or component differs from an expected ‘reference’ image. You can use visual regression tests if you want to refactor code to produce the same result that you already have.

via Are you writing legacy CSS code? | Tinned Fruit

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