content_image/303928.jpg
<img src='content_image/303928.jpg'>

## 4.4 Content analysis 

Our next aim was to explore if the collected data offers evidence that tweets in the ASD and control data sets differ significantly by their content (i.e. topic of conversation) and if so, if automatic methods could be employed in the analysis of this content. 

## 4.4.1 Word frequency 

In the first experiment we approached this task by comparing the most frequently used words in the two data sets. These words can be seen as a simple cumulative proxy for the actual content of individual messages. The key results are illustrated in Fig. 5(a) and Fig. 5(b) which show the 100 most frequent words in respectively the ASD and control data sets, displayed as so-called ‘word-clouds’ whereby the frequency of a particular word is encoded 

