What are base and sub-themes?

Thematic analyses and categorizes text using a set of themes it creates for each data set. These themes are customizable and organized in a system of base and sub-themes.

  • Base themes are general concepts or topics, while sub-themes are more specific. 
  • Sub-themes are grouped under the most relevant Base theme. 
  • A single comment can be tagged with multiple base and sub-themes.
  • Each theme has its own mapped phrases discovered and set by the Thematic algorithm. They are used to identify and tag the text with themes.

An example of a base theme and its sub-themes is checked bag from our airline's demo.

checked bag (Base theme)

  • checked bags (other) (Sub-theme)
  • free bags (Sub-theme)
  • baggage fees (Sub-theme)
  • bags not on flight (Sub-theme)
  • bags not free (Sub-theme)

What is an (other) sub-theme? 

The (other) sub-theme is used to identify comments that fall under the base themes but not any of its specific sub-themes.

Does all the sub-themes volume add up to the base themes volume?

No, because comments can be tagged with multiple themes, and not all comments tagged with a base theme will also be tagged with a sub-theme under the base theme.

Mapped phrases

The sub-theme bags not free has a set of mapped phrases it uses to tag responses.

bags not free

  • "baggage is not free"
  • "bags are not free"
  • "checked bags are not free"

Editing themes and mapped phrases

Thematic themes and mapped phrases can be edited for any of your data sets. Reach out to your contact at Thematic to discuss the changes you'd like to make.

Some possible changes include

  • Renaming themes
  • Deleting irrelevant themes
  • Combining similar themes
  • Moving a sub-theme under a different base theme
  • Changing a sub-theme to a base theme
  • Changing a base theme to a sub-theme under a base theme
  • Modifying a mapped phrase
  • Adding a new mapped phrase
  • Deleting a mapped phrase

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