The phrase "activity category" is correct and usable in written English.
It can be used when classifying or organizing different types of activities within a specific context, such as in research, surveys, or project management.
Example: "In our study, we divided the responses into three main activity categories: leisure, work, and exercise."
Alternatives: "type of activity" or "activity type."
These adjustments were more or less evenly split between adding more time to an activity category or taking less time to complete an activity category.
This study observed that genes involved in the oxidoreductase activity category were most significantly differentially expressed under micro-g conditions.
Human activity prediction is defined as inferring the high-level activity category with the observation of only a few action units.
For each activity category data were obtained on the mean duration of uninterrupted sequences of activities and their relative time proportion in the job.
Within each activity category there are usually multiple activities, such as watching each video clip, discussing each clip, and comparing the clips.
If an entire activity category was left out of a session during the rehearsal, the individual activities within that category were not rated for modifications.
The percentage can be applied to the overall time to completion to give the amount of time spent on each activity category.
Therefore, for each 1-s time interval, one can assess whether a problem-solving activity category does or does not occur in actual behavior.
In all cases, the decisions that Hannah made to spend more or less time on a given activity category, or to leave out an activity category, were informally discussed by the raters and deemed to be consonant with the designers' intentions.
For each minute on rounds only one activity category and one location category was recorded.
The data collected were used to estimate total weekly PA by weighting the reported minutes per week within each activity category.
