Tag: Tableau

Data Operations: Wie Sie die Performance Ihrer Datenanalyse und Dashboards steigern

#dataops: Folgen Sie der Diskussion auf Twitter
#dataops: Folgen Sie der Diskussion auf Twitter

Sind Sie mit der Geschwindigkeit Ihrer Datenanlyse unzufrieden? Oder haben Ihre Dashboards lange Ladezeiten? Dann können Sie bzw. Ihr Datenbank-Administrator folgenden Hinweisen nachgehen, die sich je nach Datenquelle unterscheiden können.

Allgemeine Empfehlungen zur Performance-Optimierung

Möchten Sie die Geschwindigkeit der Analyse verbessern? Dann beachten Sie folgende Punkte:

  • Benutzen Sie mehrere »kleinere« Datenquellen für individuelle Fragestellungen anstatt einer einzigen Datenquelle, die alle Fragestellungen abdecken soll.
  • Verzichten Sie auf nicht notwendige Verknüpfungen.
  • Aktivieren Sie in Tableau die Option »Referentielle Integrität voraussetzen« im »Daten«-Menü (siehe Abbildung 2.20). Wenn Sie diese Option verwenden, schließt Tableau die verknüpften Tabellen nur dann in die Datenabfrage ein, wenn sie explizit in der Ansicht verwendet wird*. Wenn Ihre Daten nicht über referentielle Integrität verfügen, sind die Abfrageergebnisse möglicherweise ungenau.
Aktivierte Option „Referentielle Integrität voraussetzen“ im „Daten“-Menü
Abbildung 2.20: Aktivierte Option »Referentielle Integrität voraussetzen« im »Daten«-Menü

* So wird beispielsweise der Umsatz anstatt mit der SQL-Abfrage SELECT SUM([Sales Amount]) FROM [Sales] S INNER JOIN [Product Catalog] P ON S.ProductID = P.ProductID lediglich mit der SQL-Abfrage SELECT SUM([Sales Amount]) FROM [Sales] ermittelt.

Empfehlungen für Performance-Optimierung bei Dateien und Cloud-Diensten

Achten Sie insbesondere beim Arbeiten mit Dateiformaten, wie Excel-, PDF- oder Textdateien, oder Daten aus Cloud-Diensten wie Google Tabellen zusätzlich auf folgende Punkte:

  • Verzichten Sie auf Vereinigungen über viele Dateien hinweg, da deren Verarbeitung sehr zeitintensiv ist.
  • Nutzen Sie einen Datenextrakt anstatt einer Live-Verbindung, falls Sie nicht mit einem schnellen Datenbanksystem arbeiten (siehe Wann sollten Sie Datenextrakte und wann Live-Verbindungen verwenden).
  • Stellen Sie sicher, dass Sie beim Erstellen des Extrakts die Option »Einzelne Tabelle« wählen, anstatt der Option »Mehrere Tabellen« (siehe Abbildung 2.21). Dadurch wird das erzeugte Extrakt zwar größer und das Erstellen des Extrakts dauert länger, das Abfragen hingegen wird um ein Vielfaches beschleunigt.
Ausgewählte Option „Einzelne Tabelle“ im „Daten extrahieren“-Dialog
Abbildung 2.21: Ausgewählte Option »Einzelne Tabelle« im »Daten extrahieren«-Dialog

Empfehlungen für Performance-Optimierung bei Datenbank-Servern

Arbeiten Sie mit Daten auf einem Datenbank-Server, wie Oracle, PostgreSQL oder Microsoft SQL Server, und möchten die Zugriffszeiten verbessern? Dann achten Sie bzw. der dafür zuständige Datenbankadministrator zusätzlich auf folgende Punkte:

  • Definieren Sie für Ihre Datenbank-Tabellen sinnvolle Index-Spalten.
  • Legen Sie für Ihre Datenbank-Tabellen Partitionen an.

Dieser Beitrag ist der dritte Teil der Data-Operations-Serie:

Teil 1: Daten für die Analyse optimal vorbereiten
Teil 2: Wann sollten Sie Datenextrakte und wann Live-Verbindungen verwenden
Teil 3: Wie Sie die Performance Ihrer Datenanalyse und Dashboards steigern

Außerdem basiert dieser Blog-Post auf einem Unterkapitel des Buches “Datenvisualisierung mit Tableau“:

Datenvisualisierung mit Tableau
Datenvisualisierung mit Tableau
  • Alexander Loth
  • Publisher: mitp
  • Edition no. 2018 (31.07.2018)
  • Broschiert: 224 pages
29,99 EUR
Auf Amazon kaufen

How to research LinkedIn profiles in Tableau with Python and Azure Cognitive Services

Tableau is using Python to access the Web Services API provided by Microsoft Azure Cognitive Services
Tableau is using Python to access the Web Services API provided by Microsoft Azure Cognitive Services

A few weeks after the fantastic Tableau Conference in New Orleans, I received an email from a data scientist who attended my TC18 social media session. She had a quite interesing question:

How can a Tableau dashboard that displays contacts (name & company) automatically lookup LinkedIn profile URLs?

Of course, researching LinkedIn profiles for a huge list of people is a very repetitive task. So let’s find a solution to improve this workflow…

1. Python and TabPy

We use Python to build API requests, communicate with Azure Cognitive Services and to verify the returned search results. In order to use Python within Tableau, we need to setup TabPy. If you haven’t done this yet: checkout my TabPy tutorial.

2. Microsoft Azure Cognitive Services

One of many APIs provided by Azure Cognitive Services is the Web Search API. We use this API to search for name + company + “linkedin”. The first three results are then validated by our Python script. One of the results should contain the corresponding LinkedIn profile.

3. Calculated Field in Tableau

Let’s wrap our Python script together and create a Calculated Field in Tableau:

4. Tableau dashboard with URL action

Adding a URL action with our new Calculated Field will do the trick. Now you can click on the LinkedIn icon and a new browser tab (or the LinkedIn app if installed) opens.

LinkedIn demo on Tableau Public

Is this useful for you? Feel free to download the Tableau workbook (don’t forget to add your API key), leave a comment and share this tweet:

The Empathy Machine: Are Digital Technologies the Best Bet in Telling about your Cause?

The panel discussion “The empathy machine: are digital technologies the best bet in telling about your cause?” took place on the opening day of the 2018 Fundamental Rights Forum (FRA). This forum was organized by the European Union Agency for Fundamental Rights, and took place at the METAStadt Vienna 25-27 September 2018.

In this panel discussion Kadri Kõusaar (a Oscar nominated film director), Fanny Hidvegi (European Policy Manager) and me discussed if digital technologies really are the “empathy machine” and how innovative applications can help human rights defenders to achieve some challenging goals such as a change in public attitudes or meeting tough fund-raising targets. The panel discussion was moderated by the virtual reality artist Dr. Frederick Baker.

In this blog post I want to share some of the panel’s questions, which I answered:

1. How do algorithms interfere with human rights?

When algorithms make certain decisions, these algorithms  tent to mirror what they are shown with training sets. This is especially apparent for issues such as bias and machine discrimination. Both might be the result of the content of the training data, which reflects existing inequalities.

2. So, it’s about the data? What else makes data so important today?

The effective use of data is vital for our understanding of fundamental issues, such as human rights violations and political instability, for informing our policy-making, and for enhancing our ability to predict the next crisis. Furthermore, the scope, complexity and life-changing importance of the work being done on topics like these across the European Union has made it more important than ever for everyone participating in the public conversation and in demographic decision-making to have access to and to be able to derive insights from key data sources.

3. Where is data coming from and how can people benefit?

Every time we google something, send a tweet, or just browse a website, we create data. With the rise of visual analytics we can benefit from this vast amount of information. Visual analytics is a hands-on approach to interacting with data that does not require any programming skills. Furthermore, communicating with data, is seen as one of the most relevant skills in today’s information age.

Global Refugee Crisis visualization on Tableau Public

4. What is the easiest way to find interesting data?

I would check out the Google’s new search engine for datasets that was just released recently! Tableau Public is a good source for existings visualizations. Many of these are based on public data.

5. What is required to enable organizations to use data for good?

Data can be used for the good of society, but private- and public-sector firms, nonprofits and NGOs still lack analytics resources and expertise. Data and analytics leaders must cross traditional boundaries to use data for good, to better compete for limited talent, and to foster an ethical culture. VizForSocialGood and Tableau Foundation are good examples.

6. How can the private sector contribute for good?

Some private sector organizations are making data open and available to researchers, nonprofits and NGOs. Examples include:

  • Mastercard anonymizing credit card data to be analyzed in smart city initiatives.
  • Google making search data available to hospitals to predict infection disease outbreaks such as flu and dengue fever.
  • Insurance companies providing anonymized healthcare data to improve patient outcomes and prevention strategies.
  • Yelp providing ratings data to cities to prioritize food safety inspectors.

The panel discussion was followed by workshops in the afternoon:

 

Is Crypto Dead? What to Buy/Mine? FinTechs beyond Blockchain?

Bitcoin crashes to lowest this year, losses top 25% in a week
Bitcoin crashes to lowest this year, losses top 25% in a week | Photo Credit: via Marco Verch

Yesterday, on my way to an AI roundtable, I had an interesting conversation about the future of crypto assets. I met Michael, who works for one of the world’s biggest insurance companies, on the train from Frankfurt to Munich. Of course, our conversation started with a nifty 7-minute Tableau demo – a wonderful ice breaker!

After closing the demo with the Bitcoin Dashboard on Tableau Public, the conversation quickly headed towards crypto assets and (non-)blockchain FinTechs. These are the top 3 of Michael’s questions that I want to share with you – together with my answers:

1. Is the blockchain innovation dead?

Absolutly not! Blockchain is a relatively new technology which has a long way to go before it becomes mainstream. Last year the most successful projects were those that aimed at adapting new technologies for convenient use. Furthermore, crypto assets create a new structure of safe and anonymous storage and managing of information. Projects like Ethereum proved to be extremely useful for building a steady and secure contracts, cloud storage and product quality control.

2. Are there still interesting crypto assets to buy or to mine?

Yes, indeed! In particular I’d suggest crypto assets targeting innovative use cases. If you buy these, you are actually investing in technology projects:

  • Factom (FCT) recently announced a partnership with Equator PRO, and according to the press release that announced the -partnership, Equator PRO is a software-as-a-service (SaaS) solution that aims to offer efficiency and oversight to help other mortgage servicers.
  • Clams (CLAM) is a crypto asset similar to bitcoin, but is using a ‘proof of stake’ system, which should be more equitable and fairer than bitcoin’s ‘proof of work’ system.
  • Electroneum (ETN) has a heavy emphasis on mobility and micropayments. A huge portion of the world’s population own a mobile phone but have no bank account. Electroneum aims to provide financial services for everybody in the world who has a mobile phone.

If you are into mining, it also makes sense if you are going to mine coins with innovative technology. Currently, I would strongly consider to mine Ravencoin (RVN) and its little sister Pigeoncoin (PGN).

Factom use cases
Factom use cases

3. Which non-blockchain related FinTech might be worth to look at?

Definetly Mintos! Mintos is much more than a regular peer-to-peer lending platform. Mintos is a global online marketplace for loans, which provides retail investors an easy and transparent way to invest in loans originated by a variety of alternative lending companies around the world. Furthermore, Mintos has demonstrated exponential growth and has become the world’s largest marketplace of its kind.

What’s your view on crypto? Let me know in the comments or via Twitter:

#TC18 Visual Diary: One Big-Easy Data Fest

Iron Viz contest at Tableau Conference TC18 in New Orleans
Iron Viz contest at Tableau Conference TC18 in New Orleans

Let me share some (personal) Tableau Conference #TC18 experiences with you!

Oct 22

Registration

Viz for Social Good

Welcome Reception

Oct 23

Opening Keynote

My 1st Session | Rock your Social Media Data with Tableau

Data Village | Diversity and Inclusion

Community Appreciation Reception

Oct 24

Keynote | Devs On Stage

My 2nd Session | Rock your Social Media Data with Tableau

Tableau User Group | Tip Battle

Iron Viz

Data Night Out

Oct 25

Keynote | Adam Grant

Data Village

Fanalytics

Goodbye

What are your #TC18 highlights?

Share your favorite moments in the blog post comments or reply to this tweet: