Jie Wu

Jie Wu
product marketing professional; data maniac; love to explore parts of the world I don't know about; love the san francisco hills..

Reflections Of A Former Data Analyst (Part 2) – Changing The Game For Data Plumbing


Elephant cleansing

Cleaning. Sometimes is challenging!

In my last blog I promised I would report back my experience on using Informatica Data Quality, a software tool that helps automate the hectic, tedious data plumbing task, a task that routinely consumes more than 80% of the analyst time. Today, I am happy to share what I’ve learned in the past couple of months.

But first, let me confess something. The reason it took me so long to get here was that I was dreaded by trying the software.  Never a savvy computer programmer, I was convinced that I would not be technical enough to master the tool and it would turn into a lengthy learning experience. The mental barrier dragged me down for a couple of months and I finally bit the bullet and got my hands on the software. I am happy to report that my fear  was truly unnecessary –  It took me one half day to get a good handle on most features in the Analyst Tool, a component  of the Data Quality designed for analyst and business users,   then I spent 3 days trying to figure out how to maneuver the Developer Tool, another key piece of the Data Quality offering mostly used by – you guessed it, developers and technical users.  I have to admit that I am no master of the Developer Tool after 3 days of wrestling with it, but, I got the basics and more importantly, my hands-on interaction with the entire software helped me understand the logic behind the overall design, and see for myself  how analyst and business user can easily collaborate with their IT counterpart within our Data Quality environment.

To break it all down, first comes to Profiling. As analyst we understand too well the importance of profiling as it provides an anatomy of the raw data we collected. In many cases, it is a must have first step in data preparation (especially when our  raw data came from different places and can also carry different formats).  A heavy user of Excel, I used to rely on all the tricks available in the spreadsheet to gain visibility of my data. I would filter, sort, build pivot table, make charts to learn what’s in my raw data.  Depending on how many columns in my data set, it could take hours, sometimes days just to figure out whether the data I received was any good at all, and how good it was.

which one do you like better?

which one do you like better?

Switching to the Analyst Tool in Data Quality, learning my raw data becomes a task of a few clicks – maximum 6 if I am picky about how I want it to be done.  Basically I load my data, click on a couple of options, and let the software do the rest.  A few seconds later I am able to visualize the statistics of the data fields I choose to examine,  I can also measure the quality of the raw data by using Scorecard feature in the software. No more fiddling with spreadsheet and staring at busy rows and columns.  Take a look at the above screenshots and let me know your preference?

Once I decide that my raw data is adequate enough to use after the profiling, I still need to clean up the nonsense in it before performing any analysis work, otherwise  bad things can happen — we call it garbage in garbage out. Again, to clean and standardize my data, Excel came to rescue in the past.  I would play with different functions and learn new ones, write macro or simply do it by hand. It was tedious but worked if I worked on static data set. Problem however, was when I needed to incorporate new data sources in a different format, many of the previously built formula would break loose and become inapplicable. I would have to start all over again. Spreadsheet tricks simply don’t scale in those situation.

Rule Builder in Analyst Tool

Rule Builder in Analyst Tool

With Data Quality Analyst Tool, I can use the Rule Builder to create a set of logical rules in hierarchical manner based on my objectives,  and test those rules to see the immediate results. The nice thing is, those rules are not subject to data format, location, or size, so I can reuse them when the new data comes in.  Profiling can be done at any time so I can re-examine my data after applying the rules, as many times as I like. Once I am satisfied with the rules, they will be passed on to my peers in IT so they can create executable rules based on the logic I create and run them automatically in production. No more worrying about the difference in format, volume or other discrepancies in the data sets, all the complexity is taken care of by the software, and all I need to do is to build meaningful rules to transform the data to the appropriate condition so I can have good quality data to work with for my analysis.  Best part? I can do all of the above without hassling my IT – feeling empowered is awesome!

Changing The Game For Data Plumbing

Use the Right Tool for the Job

Use the right tool for the right job will improve our results, save us time, and make our jobs much more enjoyable. For me, no more Excel for data cleansing after trying our Data Quality software, because now I can get a more done in less time, and I am no longer stressed out by the lengthy process.

I encourage my analyst friends to try Informatica Data Quality, or at least the Analyst Tool in it.  If you are like me, feeling weary about the steep learning curve then fear no more. Besides, if Data Quality can cut down your data cleansing time by half (mind you our customers have reported higher numbers), how many more predictive models you can build, how much you will learn, and how much faster you can build your reports in Tableau, with more confidence?

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Reflections of a Former Analyst

In my last blog, I talked about the dreadful experience of cleaning raw data by hand as a former analyst a few years back. Well, the truth is, I was not alone. At a recent data mining Meetup event in San Francisco bay area,  I asked a few analysts: “How much time do you spend on cleaning your data at work?”  “More than 80% of my time” and “most my days” said the analysts, and “they are not fun”.

But check this out: There are over a dozen Meetup groups focused on data science and data mining here in the bay area I live. Those groups put on events multiple times a month, with topics often around hot, emerging  technologies such as machine learning, graph analysis, real-time analytics, new algorithm on analyzing social media data, and of course, anything Big Data.  Cools BI tools, new programming models and algorithms for better analysis are a big draw to data practitioners these days.

That got me thinking… if what analysts said to me is true, i.e., they spent 80% of their time on data prepping and 1/4 of that time analyzing the data and visualizing the results, which BTW, “is actually fun”, quoting a data analyst, then why are they drawn to the events focused on discussing the tools that can only help them 20% of the time? Why wouldn’t they want to explore technologies that can help address the dreadful 80% of the data scrubbing task they complain about?

Having been there myself, I thought perhaps a little self-reflection would help answer the question.

As a student of math, I love data and am fascinated about good stories I can discover from them.  My two-year math program in graduate school was primarily focused on learning how to build fabulous math models to simulate the real events, and use those formula to predict the future, or look for meaningful patterns.

I used BI and statistical analysis tools while at school, and continued to use them at work after I graduated. Those software were great in that they helped me get to the results and see what’s in my data, and I can develop conclusions and make recommendations based on those insights for my clients. Without BI and visualization tools, I would not have delivered any results.

That was fun and glamorous part of my job as an analyst, but when I was not creating nice charts and presentations to tell the stories in my data, I was spending time, great amount of time, sometimes up to the wee hours cleaning and verifying my data, I was convinced that was part of my job and I just had to suck it up.

It was only a few months ago that I stumbled upon data quality software – it happened when I joined Informatica. At first I thought they were talking to the wrong person when they started pitching me data quality solutions.

Turns out, the concept of data quality automation is a highly relevant and extremely intuitive subject to me, and for anyone who is dealing with data on the regular basis. Data quality software offers an automated process for data cleansing and is much faster and delivers more accurate results than manual process.  To put that in  math context, if a data quality tool can  reduce the data cleansing effort  from 80% to 40% (btw, this is hardly a random number, some of our customers have reported much better results),  that means analysts can now free up 40% of their time from scrubbing data,  and use that times to do the things they like  – playing with data in BI tools, building new models or running more scenarios,  producing different views of the data and discovering things they may not be able to before, and do all of that with clean, trusted data. No more bored to death experience, what they are left with are improved productivity, more accurate and consistent results, compelling stories about data, and most important, they can focus on doing the things they like! Not too shabby right?

I am excited about trying out the data quality tools we have here at Informtica, my fellow analysts, you should start looking into them also.  And I will check back in soon with more stories to share..




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