Big data

Big data is now part of the P5 syllabus:

Discuss the development of big data and its impact on performance measurement and management, including the risks and challenges it presents.

Development of big data

There are many definitions of the term ‘big data’ but most suggest something like the following:

'Extremely large collections of data (data sets) that may be analysed to reveal patterns, trends, and associations, especially relating to human behaviour and interactions.'

In addition, many definitions also state that the data sets are so large that conventional methods of storing and processing the data will not work.

In 2001 Doug Laney, an analyst with Gartner (a large US IT consultancy company) stated that big data has the following characteristics, known as the 3Vs:

  • Volume
  • Variety
  • Velocity


These characteristics, and sometimes additional ones, have been generally adopted as the essential qualities of big data.
 

big-data2-diagram


The commonest fourth 'V' that is sometimes added is:
Veracity: is the data true and can its accuracy be relied upon?
 

Volume

The volume of big data held by large companies such as Walmart (supermarkets), Apple and EBay is measured in multiple petabytes. What is a petabyte? It’s 1015 bytes (characters) of information. A typical disc on a personal computer (PC) holds 109 bytes (a gigabyte), so the big data depositories of these companies hold at least the data that could typically be held on 1 million PCs, perhaps even 10 to 20 million PCs.

These numbers probably mean little even when converted into equivalent PCs. It is more instructive to list some of the types of data that large companies will typically store.

Retailers
Via loyalty cards being swiped at checkouts: details of all purchases you make, when, where, how you pay, use of coupons.

Via websites: every product you have every looked at, every page you have visited, every product you have ever bought. 

Social media (such as Facebook and Twitter)
Friends and contacts, postings made, your location when postings are made, photographs (that can be scanned for identification), any other data you might choose to reveal to the universe.

Mobile phone companies
Numbers you ring, texts you send (which can be automatically scanned for key words), every location your phone has ever been whilst switched on (to an accuracy of a few metres), your browsing habits. Voice mails.

Internet providers and browser providers
Every site and every page you visit. Information about all downloads and all emails (again these are routinely scanned to provide insights into your interests). Search terms which you enter.

Banking systems
Every receipt, payment, credit card information (amount, date, retailer, location), location of ATM machines used.
 

Variety

Some of the variety of information can be seen from the examples listed above. In particular, the following types of information are held:

  • Browsing activities: sites, pages visited, membership of sites, downloads, searches
  • Financial transactions
  • Interests
  • Buying habits
  • Reaction to advertisements on the internet or to advertising emails
  • Geographical information
  • Information about social and business contacts
  • Text
  • Numerical information
  • Graphical information (such as photographs)
  • Oral information (such as voice mails)
  • Technical information, such as jet engine vibration and temperature analysis


This data can be both structured and unstructured:

Structured data: this data is stored within defined fields (numerical, text, date etc) often with defined lengths, within a defined record, in a file of similar records. Structured data requires a model of the types and format of business data that will be recorded and how the data will be stored, processed and accessed. This is called a data model. Designing the model defines and limits the data which can be collected and stored, and the processing that can be performed on it.

An example of structured data is found in banking systems, which record the receipts and payments from your current account: date, amount, receipt/payment, short explanations such as payee or source of the money.

Structured data is easily accessible by well-established database structured query languages.

Unstructured data: refers to information that does not have a pre-defined data-model. It comes in all shapes and sizes and it is this variety and irregularity which makes it difficult to store in a way that will allow it to be analysed, searched or otherwise used. An often quoted statistic is that 80% of business data is unstructured, residing it in word processor documents, spreadsheets, PowerPoint files, audio, video, social media interactions and map data.

Here is an example of unstructured data and an example of its use in a retail environment:

You enter a large store and have your mobile phone with you. That allows your movement round the store to be tracked. The store might or might not know who you are (depending on whether it knows your mobile phone number). The store can record what departments you visit, and how long you spend in each. Security cameras in the ceiling match up your image with the phone, so now they know what you look like and would be able to recognise you on future visits. You pass near a particular product and previous records show that you had looked at that product before, so a text message can be sent perhaps reminding you about it, or advertising a 10% price reduction. Perhaps the store has a marketing campaign that states that it will never be undersold, so when you pass near products you might be making a price comparison and the store has to check prices on other stores websites and message you with a new price. If you buy the product then the store might have further marketing opportunities for related products and consumables and this data has to be recorded also. You pay with an affinity credit card (a card with associations with another organisations such as a charity or an airline), so now the store has some insight into your interests. Perhaps you buy several products and the store will want to discover if these items are generally bought together.

So just walking round a store can generate a vast quantity of data which will be very different in size and nature for every individual.
 

Velocity

Information must be provided quickly enough to be of use in decision-making and performance management. For example, in the above store scenario, there would be little use in obtaining the price-comparison information and texting customers once they had left the store. If facial recognition is going to be used by shops and hotels, it has to be more or less instant so that guests can be welcomed by name.

You will understand that the volume and variety conspire against velocity and, so, methods have to be found to process huge quantities of non-uniform, awkward data in real-time.

Software for big data
Without getting too technical on this issue, a library of software known as Apache Hadoop is specifically designed to allow for the distributed processing of large data sets (ie big data) across clusters of computers using simple programming models. (Clusters of computers are needed to hold the vast volume of information.) Hadoop IT is designed to scale up from single servers to thousands of machines, each offering local computation and storage.

The processing of big data is generally known as big data analytics and includes:

  • Data mining: analysing data to identify patterns and establish relationships such as associations (where several events are connected), sequences (where one event leads to another) and correlations.
  • Predictive analytics: a type of data mining which aims to predict future events. For example, the chance of someone being persuaded to upgrade a flight.
  • Text analytics: scanning text such as emails and word processing documents to extract useful information. It could simply be looking for key-words that indicate an interest in a product or place.
  • Voice analytics: as above but with audio.
  • Statistical analytics: used to identify trends, correlations and changes in behaviour.


Google provides website owners with Google Analytics that will track many features of website traffic. For example, the website OpenTuition.com provides free ACCA study resources. Google analytics reports statistics such as the following:


GEOGRAPHICAL DISTRIBUTION OF USERS

big-data1


TYPE OF BROWSER USED

bigdata-2

AGE OF USER

bigdata-3

The final table is instructive. OpenTuition.com does not ask for users’ ages, so this data has been pieced together from other information available to Google. It has been able to do this for only about 58% of users.

The analytical findings can lead to:

  • Better marketing
  • Better customer service and relationship management
  • Increased customer loyalty
  • Increased competitive strength
  • Increased operational efficiency
  • The discovery of new sources of revenue.


Other examples of the use of big data

Netflix: this company began as a DVD mailing service and developed algorithms to help it to predict viewers’ preferences and habits. Now it delivers films over the internet and can easily collect information about when movies are watched, how often films might be stopped and restarted, where they might be abandoned, and how users rate films. This allows Netflix to predict which films will be popular with which customers. It is also being used by Netflix to produce its own TV series, with much greater assurance that these will be hits.

Amazon: the world’s leading e-retailer collects huge amounts of information about customers’ preferences and habits which allow it to market very accurately to each customer. For example, it routinely makes recommendations to customers based on books or DVDs previously purchased.

Airlines: they know where you’ve flown, preferred seats, cabin class, when you fly, how often you search for a flight before booking, how susceptible you are to price reductions, probably which airline you might book with instead, whether you are returning with them but didn’t fly out with them, whether car hire was purchased last time, what class of hotel you might book through their site, which routes are growing in popularity, seasonality of routes. They also know the profitability of each customer so that, for example, if a flight is cancelled they can help the most valuable customers first.

This information allows airlines to design new routes and timings, match routes to planes and also to make individualised offers to each potential passenger.

Disease epidemic identification: In 2009, Google was able to track the spread of influenza across the USA faster than the government’s Center for Disease Control and Prevention. How? They monitored users entering terms like ‘Flu symptoms’, ‘Flu remedies’, High temperature’. This connection was uncovered by web analytics looking at popular search terms then finding a correlation with other information confirming influenza infections. Of course, you have to be careful drawing conclusions about correlations: the association between the use of search terms and the outbreak of flu might be driven by news articles on the spread of the epidemic rather than the epidemic itself.

Target: Target is the second largest discount retailer in the USA. There is an often quoted story about their ability to predict when a customer is pregnant – frequently before the customer has informed her family. By looking at about 25 products it is claimed that they can create a pregnancy predictor. For example, early pregnancy often causes morning sickness so consumers would perhaps change to blander food and less perfumed shower gel. Why would Target be interested in knowing whether a consumer is pregnant? Well that person will require different products during the pregnancy then in a few months the baby will have its own product needs: nappies, baby shampoo and clothes. Early identification of pregnancy can allow Target to establish the shopping habits of the mother and perhaps even the preferences of the child.

Dangers/risks of big data

Despite the examples of the use of big data in commerce, particularly for marketing and customer relationship management, there are some potential dangers and drawbacks.

Cost: It is expensive to establish the hardware and analytical software needed, though these costs are continually falling.

Regulation: Some countries and cultures worry about the amount of information that is being collected and have passed laws governing its collection, storage and use. Breaking a law can have serious reputational and punitive consequences.

Loss and theft of data: Apart from the consequences arising from regulatory breaches as mentioned above, companies might find themselves open to civil legal action if data were stolen and individuals suffered as a consequence.

Incorrect data (veracity): If the data held is incorrect or out of date incorrect conclusions are likely. Even if the data is correct, some correlations might be spurious leading to false positive results.
 

Ken Garrett is a freelance lecturer and writer