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Codes and Frequencies

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LOWQUAL reports whether the diary is low quality.

A high-quality diary has the following characteristics:

  • The diary has 90 minutes or less missing main activity time after imputation (that is they have accounted for majority of the day);
  • The diary has 7 or more episodes;
  • The diary includes some time recorded in at least 2 of 4 basic activities as a primary or secondary activity (or in the case of travel, marked through location of means of transport) in which one would expect a diarists to have engaged on any given day. The four main activities include sleep or rest, eat or drink, personal care, and travel or exercise. We did note that some people providing child care to multiple children or to an infant as well as some diarists performing adult care did not record travel.


This variable is comparable across years.


  • All persons.


  • 1930, 1965, 1975, 1985, 1993, 1995, 1998, 2003-2012, 2018


This variable has no flags.