The trend chart represents a central component of the webLyzard dashboard, based on the selected data sources and time interval – with a default setting of two months, which can be changed using the date selector. Whenever a different combination of sources or topics is selected, dynamic transitions show how these changes impact the displayed data sets. Recently added features such as dynamic transitions, moving averages and data export increase the charts’ flexibility and make it easier to utilize the supplied data in external applications.
The line chart shows the evolution of data indicators over time, either in the context of the global filter or in absolute numbers. If the global filter is active, the chart can be used to work with facets of filtered coverage to visualize e.g. the language or source distribution over time. Hovering above data points displays tooltips with the top three keywords and daily statistics. This helps to identify emerging trends and shows what has caused a particular peak in the chart. Clicking on a data point activates the tooltip. The following data sets are available via the menu on the left:
- Frequency aggregates the number of occurrences on a given day, week or month (depending on the moving average setting).
- Share of Voice is a relative measure of attention that divides frequency by the total number of documents published in the moving average interval (day, week or month), thereby adjusting for cyclic changes in total coverage such as weekends or holidays.
- Impact is a modified frequency measure that considers the reach of a document’s source. Reach is based on a Website’s traffic statistics, or the number of followers in the case of social media postings.
- Sentiment (mean) shows the average sentiment towards a certain topic.
- Disagreement (standard deviation of sentiment) reflects how contested a topic is. The term ‘oil spill’, for example, has a low standard deviation since everyone agrees on its negative connotation.
Complementing the time series selection and moving average specification described above, the context menu allows activating additional diagrams such as the donut chart or radar chart.
- Donut Chart. This diagram is only available for frequency and sentiment data. It is synchronized with the topic management section and the line chart. Adaptive tooltips offer keywords per topic for frequency data, or the most important positive and negative associations with the chosen set of topics for sentiment data.
- Additional Features. The context menu of the trend chart offers an optional calculation of moving averages: If disabled, the charts present the raw data to reveal specific events. If enabled (available intervals: 7, 30 or 60 days), the focus of the analysis shifts to trend detection. Depending on the dashboard configuration, the contextual menu may offer additional features such as the WYSDOM success metric or the Brand Reputation Radar. The trend chart can also be enlarged using the arrow button in the upper right corner.
The integrated export function allows retrieving the full data set consisting of daily frequency, sentiment, and disagreement values for the selected time interval in native MS Excel format, or as a comma-separated CSV file for various external applications – e.g., data warehouses, business intelligence tools, statistical packages such as R and SPSS, etc.