Content analysis is the systematic analysis of the content of a text—e.g., who says what, to whom, why, and to what extent and with what effect—in a quantitative or qualitative manner. Content analysis is typically conducted as follows. First, when there are many texts to analyse—e.g., newspaper stories, financial reports, blog postings, online reviews, etc.—the researcher begins by sampling a selected set of texts from the population of texts for analysis. This process is not random, but instead, texts that have more pertinent content should be chosen selectively. Second, the researcher identifies and applies rules to divide each text into segments or ‘chunks’ that can be treated as separate units of analysis. This process is called unitising. For example, assumptions, effects, enablers, and barriers in texts may constitute such units. Third, the researcher constructs and applies one or more concepts to each unitised text segment in a process called coding. For coding purposes, a coding scheme is used based on the themes the researcher is searching for or uncovers as they classify the text. Finally, the coded data is analysed, often both quantitatively and qualitatively, to determine which themes occur most frequently, in what contexts, and how they are related to each other.
A simple type of content analysis is sentiment analysis—a technique used to capture people’s opinion or attitude toward an object, person, or phenomenon. Reading online messages about a political candidate posted on an online forum and classifying each message as positive, negative, or neutral is an example of such an analysis. In this case, each message represents one unit of analysis. This analysis will help identify whether the sample as a whole is positively or negatively disposed, or neutral towards that candidate. Examining the content of online reviews in a similar manner is another example. Though this analysis can be done manually, for very large datasets—e.g., millions of text records—natural language processing and text analytics based software programs are available to automate the coding process, and maintain a record of how people’s sentiments fluctuate with time.
A frequent criticism of content analysis is that it lacks a set of systematic procedures that would allow the analysis to be replicated by other researchers. Schilling (2006) addressed this criticism by organising different content analytic procedures into a spiral model. This model consists of five levels or phases in interpreting text: convert recorded tapes into raw text data or transcripts for content analysis, convert raw data into condensed protocols, convert condensed protocols into a preliminary category system, use the preliminary category system to generate coded protocols, and analyse coded protocols to generate interpretations about the phenomenon of interest.
Content analysis has several limitations. First, the coding process is restricted to the information available in text form. For instance, if a researcher is interested in studying people’s views on capital punishment, but no such archive of text documents is available, then the analysis cannot be done. Second, sampling must be done carefully to avoid sampling bias. For instance, if your population is the published research literature on a given topic, then you have systematically omitted unpublished research or the most recent work that is yet to be published.
