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Tools for Text Analysis

PRODUCT / News (trial, release history)

T-LAB 9.1 was released on March 14th 2014.

The most important improvements concern the Thematic Analysis tools.

More specifically:

- when the entire corpus can be considered like a discourse and/or its various sections (e.g. chapters of a book, parts of an interview, turns in a conversation or a debate, etc.) follow each other in a temporal order, the Thematic Analysis of Elementary Contexts tool allows the user to explore sequential relationships between themes, either by means of static charts and tables or by means of animated charts showing changes over time. This way the user can check either when people are engaged in specific themes (e.g. by looking at a diagonal of the matrix below) or when they shift from a dominant theme to another.

N.B.: The following picture and the animated charts below refer to a thematic analysis of The Politics of Climate Change (by Anthony Giddens) published on the T-LAB website.

- when using some thematic analysis tools (i.e. Modeling of Emerging Themes, Thematic Analysis of Elementary Contexts, Thematic Document Classification), by clicking the Quality Indices button (see below) it is possible to obtain a HTML file listing various measures which allow the user to assess the quality of the chosen partition and the semantic coherence of each theme.

- when performing a Thematic Document Classification and the analysis units (i.e. documents) are up to 3,000, by setting a T-LAB advanced option it is possible to obtain pairwise document similarities measures and so compare each document with all the others.

- when performing a thematic analysis of up to 3,000 analysis units (either text segments or documents), all data points can be plotted by means of the Correspondence Analysis tool (see below);

 


T-LAB 9.0 was released on October 14 2013.

Listed below are some of the key improvements and new features.

A new powerful and easy to use module named Corpus Builder has been added (see the pictures below) which allows easy transformation of any textual material into a corpus ready to be processed by T-LAB. Files in up to ten different formats can be quickly imported. In many cases the 'drag and drop' method is also allowed;

By using the Corpus Builder module the user is allowed to gather up to 30,000 texts; however, when using the 'Open Table' option and the text for each line doesn't exceed 2.000 characters (e.g. responses to open-ended questions, Twitter messages etc.) then up to 99.999 records can be processed;

The above software module includes a Variable Manager tool which allows the user to edit, load, save and change any coding scheme, even from a different corpus (see below);

The layout of the main menu has been changed and it is much more intuitive;

To fulfill the requests of many users, the automatic lemmatization of German texts has been implemented;

The tools for co-occurrence analysis have been improved in various ways.
The results of various types of analysis (see the Word Association, the Co-Word Analysis and the Sequence Analysis tools) can be easily exported in several formats which can be processed by many software packages for network analysis which are available for free (see the pictures below).

 

The are now six proximity indexes available and the Word Association tool also allows the user to analyse word-based n-grams as well as obtain second order measures which highlight similarities in meaning between key-terms (see the pictures below);

Several functionalities of the tools for comparative analysis have been improved. In particular, the Cluster Analysis tool now allows easy exploration of up to twenty partitions (see the picture below).

More options are available for creating a sub-corpus and for exporting data tables (see the picture below).



T-LAB 8.1 was released on September 24th 2012.

The most important improvements concern the Cluster Analysis tool, which is enabled after having performed any Correspondence Analysis (see the comparative analysis tools).

In detail:


- the Cluster Analysis tool now allows refining the results of Ward's hierarchical method by a K-Means algorithm (see the picture below);


- when clustering lexical units, tables with cluster characteristics contain further information (e.g. distances from centroids and Test Values);


- new charts are available which allow the user to better evaluate the relative contributions of each factorial axis to the clusters (N.B.: the same type of charts are now available also in the Thematic Analysis of Elementary Contexts and Thematic Document Classification tools);


Further improvements concern the possibility of importing/exporting customised word lists when using the Co-Word Analysis tool and when creating GraphML files by means of the Sequence Analysis tool.



T-LAB 8.0 was released on May 24th 2012.

The most remarkable improvements concern the possibility of integrating top-down (i.e. supervised) and bottom-up (i.e. unsupervised) approaches for the automatic classification of textual units like words, sentences, paragraphs and short documents.

In detail:

- a new tool for thematic analysis (i.e. Dictionary-Based Classification) accepts various types of inputs and allows the user to easily build/test/apply his models (e.g. his dictionaries of categories) both for 'classical' qualitative content analysis and for sentiment analysis.
All intermediate analysis stages can be easily verified and customised. The results (e.g. the tagged textual units) can then be exported and/or analysed by using others T-LAB tools;

 

- two of the most used T-LAB tools for thematic analysis (i.e. Thematic Analysis of Elementary Contexts and Thematic Document Classification) can now work either with an unsupervised or supervised method. This means that in the first case - like in the previous version of the software - they perform unsupervised clustering of textual units (i.e. they apply the bisecting K-means), whereas in the second case they perform supervised classification by using the same algorithm of the above mentioned new tool. Moreover, as dictionaries of categories can be easily imported and exported, users can now analyse various text collections by using the same criteria.

Other improvements include:

- now both the Co-occurrence Analysis and the Thematic Analysis tools can be used with lists of key-words (or semantic categories) that include up to 3,000 items (i.e. lists including about 7,000 distinct words);

- the Key Contexts of Thematic Words tool has been completely redesigned and now allows the user to work in two different way: either by selecting key-terms or by typing/pasting sample texts in an appropriate box. In both cases T-LAB uses the cosine measure and extracts all textual units (i.e. elementary contexts) which are most similar to the user's queries. In other words, it is possible to easily explore in which contexts the listed key-terms are used in as well as checking similarities between sentences, paragraphs or short documents;

- the Specificity Analysis tool, in addition to providing measures and charts which allow the user to check which lexical units (i.e. words or lemmas) are typical of or exclusive to specific corpus subsets, now allows the easy extraction of the characteristic fragments (i.e. elementary contexts) of each analysed subsets (e.g. the 'typical' sentences used by 'men' or 'women' in specific contexts). For this purpose T-LAB uses a normalized version of TF-IDF measure;

- the Contingency Tables tool now allows the user to export co-occurrence matrices with dimensions up to 1,500 x 1,500;


T-LAB 7.3 was released on October 6th 2011.

The most significant improvements are the following:

1 - Now all T-LAB charts obtained by Correspondence Analysis, including those concerning thematic clusters, allow the user to select each item (i.e. key-word or category) to be plotted: just right click on the charts and select the 'Add/Remove items' option (see below);

2 - All charts mentioned above allow the user to plot the analysis results either by using the coordinates or the squared cosines (i.e. measures which allow us to easily appreciate the correlation between the analysed items and factorial axes).

3 - Now all word relationships within the clusters obtained by a Thematic Analysis can be explored by mean of all the co-occurrence analysis tools which in T-LAB use statistical measures, including the Sequence Analysis tool which uses Markov chains as a sort of discourse analysis (see below);

N.B.: The above graph has been obtained by importing a .graphml file created by T-LAB through the Yed software available as a free download (see link ).

4 - A Variable Manager tool has been added which allows the user to rename and group both their variables and categories (see Variable Manager).


T-LAB 7.2 was released on September 14 2010.

The user interface has been completely revised in order to make text analysis more intuitive, productive and enjoyable.

Using T-LAB 7.2 you can now open multiple windows. This allows you to simultaneously display more outputs and interpret your data better.

Moreover you can explore multiple contingency tables and, by clicking specific items, you can create various charts and HTML files.

Here are some examples of the greatly improved functions of T-LAB 7.2.

For each analysis tool two links are available: to the corresponding section of the manual (HTML) and to a video demo which shows how it works (see below).


A - TOOLS FOR CO-OCCURRENCE ANALYSIS


Word Association (Manual - Video)

Co-Word Analysis and Concept Mapping (Manual - Video)

Comparison between Word Pairs (Manual - Video)

Sequence Analysis (Manual - Video)

N.B.: By using all the above tools is now possible to check which words have been grouped into the same concept or lemma. Just click on an item of the corresponding table (see below).


B - TOOLS FOR COMPARATIVE ANALYSIS


Specificity Analysis (Manual - Video)

Correspondence Analysis (Manual - Video)

Cluster Analysis (Manual - Video)

Contingency Tables (Manual - Video)


C - TOOLS FOR THEMATIC ANALYSIS


Thematic Analysis of Elementary Contexts (Manual - Video)

Modeling of emerging Themes (Manual - Video)

Thematic Document Classification (Manual - Video)


In the new version all tables showed by T-LAB tools can be sorted in ascending and descending order just clicking any column heading.

Moreover each chart can be zoomed, maximized, customized and exported in different formats (just right click in order to show the popup menu).

 

Click here to learn more ..