*By Robert A. Muenchen*

This article describes the technical details of how to search for scholarly articles in the field of data science. The goal here is not to optimize the search for a particular article, but rather to find all articles that either use or write about a particular software package. Counts of these articles are then used to estimate the market share of each package. Note that unlike job advertisements, scholarly articles nearly all* *contain data science terms. Therefore adding such terms to the search strings don’t help focus the search. The results are displayed and discussed in The Popularity of Data Analysis Software.

**Overview**

Here are the steps I use to search at Scholar.Google.com in brief:

1. For software with non-ambiguous names, simply search on their names in quotes. Often the quotes are not needed, but it can be difficult to determine when they are. For example, Tibco’s Spotfire program has a very unique name, but Google Scholar considers articles about firefighting that include the separate terms “spot fire” to be equivalent to “spotfire” unless you enclose the name in quotes.

2. Scholarly papers are supposed to cite the software they use in a standard way. For example, the use of SAS should reference the vendor, “SAS Institute”. To verify how well such a citation works, it’s good to search for its opposite. For example, the search string: “SPSS” -“SPSS, Inc.” will exclude the vendor (the minus sign “-” excludes) but still find hits relevant to the SPSS Statistics product. While a similar search for SAS: “SAS” -“SAS Institute” will mostly consist of irrelevant hits including many authors whose first or last name happen to be “Sas”. The initials “SAS” are also the equivalent to “Inc.” in Spanish.

Searching by vendor name is very helpful, but authors don’t always cite their software. Surprisingly, authors occasionally cite the vendor but not the package. That is the case for Statsoft’s Statistica. Statistica means “statistics” in Italian perhaps leading authors to often use statements like, “we used the statistics package from Statsoft.” Now that Dell has purchased Statsoft, this will cause trouble as “Dell” is not a useful search term by itself.

3. Some software have add-on packages that are so well known that the main package may not be mentioned at all. For example, R’s ggplot2 package may be cited without reporting that R itself was used.

4. Some software names, especially Fico, Java, Python, SAS, and Scala are also common names of people and/or geographic locations. Authors can be excluded from Google Scholar searches with “-author:java”. Unfortunately, this exclusion applies to the author field, not the references at the end of a paper. That means that the counts on these packages are inflated unless the search string specifically excludes that possibility.

5. General purpose programming languages are cited most often for tasks that have nothing to do with data science. Adding inclusion terms helps focus the search. Examples include categories such as “machine learning” and specific methods, such as “regression analysis.” These search terms were added only in English, so the results are underestimates of the true data science usage of this type of software.

To make the comparisons among packages most equitable, it would be ideal to include the same set of inclusion terms for all the software studied here. However, that would mean under-counting the use of the special-purpose software, which I prefer to avoid. As a simplified example, I don’t search for “SAS and regression” but I do search for “Java and regression”. The actual, more complex, searches are below.

6. Regarding logic, Google uses a blank between terms to represent logical “AND” (the plus sign is no longer accepted for this purpose). To perform logical “or”, you must type “OR” in capital letters, or Google will search for the word “or”! Parentheses prioritize the order of the logic as usual.

7. Regarding special characters, Google Scholar ignores them. For example “H2O.ai” is the name of the company supporting the data science software, H2O. But Google will ignore the period and find references to water and artificial intelligence that have nothing to do with that company.

**Software Names and Their Search Terms
**

Here is a list of the actual search terms I used for each piece of software.

Actuate: "Actuate BIRT" (Purchased by OpenText in 2015, dropped coverage) Alpine: "Alpine Data Labs" [Acquired by Tibco in 2017; dropped coverage then] Alteryx: "Alteryx" Angoss: "Angoss" Amazon: Apache Hadoop: "Hadoop" Apache Mahout: Mahout -elephant -"mahout bay" Apache MXNet: MXNet: "MXNet" + ("deep learning" OR "machine learning" OR "neural network") Apache Pig: "Apache Pig" Apache Spark: "Apache Spark" BMDP: "BMDP" -marrow -"brain multidrug" [removing Bone Marrow Donation Program] CAFFE: "Caffe" + "Deep Learning" C++ / C#: ("C++" OR "C#") ("statistical analysis" OR "t test" OR "regression analysis" OR "quantitative analysis" OR "data analytics" OR "machine learning" OR "artificial intelligence" OR "analysis of variance" OR "anova" OR "chi square" OR "data mining") "Dataiku" "DataRobot" Dato or GraphLab (Dropped due to acquisition by Apple) Deducer GUI for R by Ian Fellows: "Deducer" + "Fellows" [Without quotes, "fellowship" will count] Domino Data Lab: "Domino Data Lab" OR "dominodatalab" FICO: [Not tracking this as I've found it impossible to separate the data science from the credit checking even using inclusion factors.] FORTRAN: FORTRAN ("statistical analysis" OR "t test" OR "regression analysis" OR "quantitative analysis" OR "data analytics" OR "machine learning" OR "artificial intelligence" OR "analysis of variance" GraphPad Prism: GraphPad Prism [Using "GraphPad Prism" will seriously undercount!] GNU Octave: "GNU Octave" ("statistical analysis" OR "t test" OR "regression analysis" OR "quantitative analysis" OR "data analytics" OR "machine learning" OR "artificial intelligence" OR "analysis of variance" OR "anova" OR "chi square" OR "data mining") H2O: "H2O.ai" OR "Oxdata H2O" OR "H2O deep learning" OR "H2O machine learning" Hadoop: "Hadoop" "IBM Watson" Infocentricity: "Infocentricity" [They were purchased by Fico, so I'm dropping coverage] [Note: do not add "OR Xeno", which is useful when searching for jobs. It adds a great deal of ambiguity to this type of search.] jamovi: [minus signs remove languages where jamovi=jam] "jamovi" -'jamova" -"za" JASP: "jasp-stats.org" OR "jasp team" OR "JASP version" Java: java -author:java -weka -"Practical Machine Learning" -indonesian ("statistical analysis" OR "t test" OR "regression analysis" OR "quantitative analysis" OR "data analytics" OR "machine learning" OR "artificial intelligence" OR "analysis of variance") JMP: "JMP" "SAS Institute" Julia: "Julia: A Fast Dynamic Language for Technical Computing" OR "julialang" Keras: "keras" + ("machine learning" OR "artificial intelligence" OR "data mining") KNIME: "KNIME" KXEN: "KXEN" (Bought by SAP, no longer tracking) Lavastorm: "Lavastorm" Mathematica: "MATLAB" ("statistical analysis" OR "t test" OR "regression analysis" OR "quantitative analysis" OR "data analytics" OR "machine learning" OR "artificial intelligence" OR "analysis of variance" OR "anova" OR "chi square" OR "data mining") MATLAB: "MATLAB" ("statistical analysis" OR "t test" OR "regression analysis" OR "quantitative analysis" OR "data analytics" OR "machine learning" OR "artificial intelligence" OR "analysis of variance" OR "anova" OR "chi square" OR "data mining") Megaputer: "Megaputer" OR "Polyanalyst" Microsoft Cognitive Toolkit: Microsoft + ("CNTK" OR "Cognitive Toolkit") Microsoft Azure Machine Learning: "Azure Machine Learning" OR "Azure ML" Minitab: "Minitab" NCSS: "Number Cruncher Statistical System" [Cannot use "NCSS" for this as it stands for over 15 organizations] Origin Pro: "originlab" ("statistical analysis" OR "t test" OR "regression analysis" OR "quantitative analysis" OR "data analytics" OR "machine learning" OR "artificial intelligence" OR "analysis of variance" OR "anova" OR "chi square" OR "data mining") Pentaho: "Pentaho" Prognoz: "Prognoz Platform" [Note: Prognoz means forecast in Polish.] [Dropped this in 2018 when count=2] Python: python -author:python -snake ("statistical analysis" OR "t test" OR "regression analysis" OR "quantitative analysis" OR "data analytics" OR "machine learning" OR "artificial intelligence" OR "analysis of variance" OR "anova" OR "chi square" OR "data mining") "Pytorch" R: 41,100 "the R software" OR "the R project" OR "r-project.org" OR "R development core" OR "bioconductor" OR "lme4" OR "nlme" OR "lmeR function" OR "ggplot2" OR "Hmisc" OR "r function" OR "r package" OR "mass package" OR "plyr package" OR "hmisc" OR "mvtnorm" [Note: replacing plyr package with dplyr or tidyverse gets fewer hits] R Commander GUI for R: "R Commander" RapidMiner: "RapidMiner" Rattle: "Rattle: A Data Mining GUI" OR "Rattle GUI" OR "Rattle package" Revolution Analytics: "Revolution Analytics" [Note: Merged with Microsoft so keywords are uncertain.] Salford Systems: "Salford Systems" (Bought by Minitab in March, 2017) SAP: "SAP" "KXEN" (No longer tracking) SAS: "SAS Institute" -JMP -"Enterprise Miner" [Note: This under counts SAS slightly but I haven't found a way around the problem given that "Sas" is a popular first and last name for authors. Also, in Spanish, "S.A.S." is the equivalent of "Inc." in English (Sociedad por acciones simplificadas.) SAS Enterprise Miner: "Enterprise Miner" Scala: "Scala language" OR "language Scala" + spark "Splunk" SPSS: SPSS -"SPSS Modeler" -"Amos" [The letters "SPSS" stand for only a few other rare topics that I estimate results in over-counting by only 0.28%.] SPSS Modeler: "SPSS Modeler" SQL: SQL ("statistical analysis" OR "t test" OR "regression analysis" OR "quantitative analysis" OR "data analytics" OR "machine learning" OR "artificial intelligence" OR "analysis of variance" OR "anova" OR "chi square" OR "data mining") Stata: ("stata" "college station") OR "StataCorp" OR "Stata Corp" OR "Stata Journal" OR "Stata Press" OR "stata command" OR "stata module" [Note: "stata" means "was" in Spanish, so by itself, you'll get a greatly inflated number of hits!] Statgraphics: "Statgraphics" Statistica: "Statistica" and (Statsoft OR Dell OR Tibco OR "Quest Software" OR "Francisco Partners") (This software has changed vendors a LOT lately!) Systat: "Systat" Tableau: (not tracking at the moment; too light on advanced analytics) "Tableau Software" OR "Tableau Desktop" OR "Tableau Online" OR "Tableau Server" [Don't include "Tableau Public", it's a common French term.] Tensorflow: "Tensorflow" Theano: "theano" + ("machine learning" OR "artificial intelligence" OR "data mining") Tibco Spotfire: Tibco + "Spotfire" -fire -burn (not tracking recently; lacks advanced analytics) WEKA: WEKA ("machine learning" OR "data mining" OR "artificial intelligence") [Note: The following search string used in previous years (before March, 2015) under-counted.] "WEKA Data Mining" OR "Waikato Environment for Knowledge Analysis"]

**Inclusion Terms**

While many of the packages are clearly focused on data science, the more general purpose ones — C++, C#, Java and Python — are not. So to determine the best way to focus the searches, I compiled a list of relevant terms commonly used in scholarly papers, then I searched for documents that included them, one at a time. I counted the number of documents for each term and tracked how likely it was to result in an accurate hit. The latter was done using the time honored, “I know it when I see it” approach. (I’m quite familiar with advanced text analytics, but I don’t have time to extract all the data and do it.) The items marked with a “*” below show the terms used. These counts were collected on 5/11/2014, but given that I was searching across all years, the prevalence of the various terms is likely to shift slowly as time passes.

Search Terms Number of ArticlesSurvey (not well focused) 5,300,000 Statistical (not well focused) 4,860,000 Statistics (not well focused) 4,770,000 Statistical analysis * 3,670,000 t test * 3,480,000 Regression analysis * 2,920,000 Linear regression 2,650,000 Quantitative analysis * 2,570,000 Data analytics * 2,380,000 Machine learning * 1,740,000 Artificial intelligence * 1,720,000 Analysis of variance 1,570,000 Chi square 1,490,000 ANOVA 1,340,000 Survey research 1,230,000 Data mining * 1,210,000 Statistical software * 1,120,000 logistic regression 1,080,000 nonparametric 800,000 Analytics (not well focused) 519,000 Statistical package 347,000 Decision trees 169,000 Business intelligence 146,000 Statistical modeling * 145,000 Analyze data (not well focused) 125,000 Big data * 51,700 Predictive modeling * 39,400 Predictive analytics * 9,540 Business analytics * 7,660 Advanced analytics 3,700

I’m very interested in improving this methodology so if you have ideas, please comment below or send me email at muenchen.bob@gmail.com.

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I’m not sure how useful this may be but I recently discovered the Open Knowledge Maps project and their code is all open source – https://openknowledgemaps.org/ One thing I had wanted to look at is identifying programming language or tool prevalence within topic networks. Anyways, just throwing that out there in case it is helpful! Your articles have been so insightful!

Hi Augustina,

That looks like fun; I’ll try it!

Thanks,

Bob

Hello Robert,

Muchas Gracias Mi Amigo! You make learning so effortless. Anyone can follow you and I would not mind following you to the moon coz I know you are like my north star.

As I need to apply color in Bar graph based on below mentioned condition,

bar BOP = blue

– bar In = red

– bar Out = green

– bar EOP = Green if EOPBOP

Note : BOP, EOP, IN and OUT are values of one ‘Trend’ column.

The Spotfire Server is the primary part of the Spotfire environment, to which all Spotfire clients join. Multiple connections are installed and attached to Spotfire Server. The Spotfire Web Player service and Spotfire Automation Services are installed on nodes to enable the usage of Spotfire web clients and the running of Spotfire Automation Services jobs.

On X Axis we need to take ‘Trend’ column and on Y Axis we need to take uniquecount(Customer Number) column.

But great job man, do keep posted with the new updates.

Regards,

Kevin

Hi Kevin Lee,

I’m glad you found my site useful. I get piles of email and don’t have time to do problem solving, so I recommend posting your question on Q&A sites like StackOverflow.com.

Cheers,

Bob