How many of you would go sky diving without learning all the necessary precautions and safety measures necessary to keep you alive? How many of you would let your kid drive your car without first teaching them the basics of driving? While not as life-and-death as the above questions, data preparation is just as important to proper data analytics as learning the basics of driving before getting behind a wheel.
Experienced data scientists will tell you data prep is (almost) everything and is the area that they spend the majority of their time. Blue Hill research reports that data analysts spend at least 2 hours per day in data preparation activities. At 2 hours per day, Blue Hill estimates that it costs about $22,000 per year per data analyst to prepare data for use in data analytics activities.
One of the reasons that prep takes up so much time is that it is generally a very manual process. You can throw tons of technology and systems at your data, but the front-end of the data analytics workflow is still very manual. While there are automated tools available to help with data preparation, this step in the process is still a very manual process.
Data preparation is important. But…what exactly is it?
The Importance of Data Preparation
Data prep is really nothing more than making sure your data meets the needs of your plans for that data. Data needs to be high quality, describable and in a format that is easily used in future analysis and has some context included around the data.
There’s tons of ways to ‘do’ data preparation. You can use databases, scripts, data management systems or just plain old excel. In fact, according to Blue Hill, 78% of analysts use excel for the majority of their data preparation work. Interestingly, 89% of those same analysts claim that they use excel for the majority of their entire data analytics workflow.
As I mentioned before, there are some tools / systems out there today to help with data prep, but they are still in their infancy. One of these companies, Paxata, is doing some very interesting stuff with data preparation, but I think we are a few years off before these types of tools become widespread.
Data preparation is integral to successful data analytics projects. To do it right, it takes a considerable amount of time and can often take the majority of a data analyst’s time. Whether you use excel, databases or a fancy system to help you with data prep, just remember the importance of data preparation.
If you don’t prepare your data correctly, your data analytics may fail miserable. The old saying of “garbage in, garbage out” definitely applies here.
How focused are you on data preparation within your organization?
from Eric D. Brown http://ericbrown.com/data-analytics-data-preparation.htm
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