docs: def compute_duration_measures(self):
          """ Helper function for computing measures derived from timing information.
  
          These are only computed if the response is textgrid with timing information.
  
          All times are in seconds.
          """
  
          prefix = "TIMING_" + self.current_similarity_measure + "_" + self.current_collection_type + "_"
  
          if self.response_format == 'TextGrid':
  
              self.compute_response_vowel_duration("TIMING_")  #prefixes don't need collection or measure type
              self.compute_response_continuant_duration("TIMING_")
              self.compute_between_collection_interval_duration(prefix)
              self.compute_within_collection_interval_duration(prefix)
  
              #these give different values depending on whether singleton clusters are counted or not
              self.compute_within_collection_vowel_duration(prefix, no_singletons = True)
              self.compute_within_collection_continuant_duration(prefix, no_singletons = True)
              self.compute_within_collection_vowel_duration(prefix, no_singletons = False)
              self.compute_within_collection_continuant_duration(prefix, no_singletons = False)