Calculates key usability indicators, including task success, completion time, errors and user satisfaction.
Value
A list containing:
- overall
Summary of all usability observations.
- by_task
Summary grouped by usability task.
- by_difficulty
Summary grouped by task difficulty, if available.
- by_experience
Summary grouped by participant experience, if available.
Details
Task success is expressed as a percentage. Completion time is reported for all attempts and for successfully completed tasks. Satisfaction is measured using the supplied 1-7 scale.
Examples
data(usability_test)
ux_usability_summary(usability_test)
#> $overall
#> observations success_rate mean_time_seconds median_time_seconds
#> 1 150 66.66667 60.072 55.65
#> mean_success_time_seconds mean_errors mean_satisfaction
#> 1 53.981 0.7533333 4.266667
#>
#> $by_task
#> task_id task_name observations success_rate mean_time_seconds
#> 1 T1 Find a product 30 83.33333 37.77000
#> 2 T2 Add product to cart 30 56.66667 50.78667
#> 3 T3 Create an account 30 60.00000 69.85000
#> 4 T4 Complete checkout 30 53.33333 84.34333
#> 5 T5 Find order information 30 80.00000 57.61000
#> median_time_seconds mean_success_time_seconds mean_errors mean_satisfaction
#> 1 36.9 35.68800 0.2000000 5.200000
#> 2 46.5 46.08235 0.9000000 4.433333
#> 3 69.9 65.28889 0.9666667 3.766667
#> 4 84.2 76.38750 0.9666667 3.366667
#> 5 53.2 55.21250 0.7333333 4.566667
#>
#> $by_difficulty
#> task_difficulty observations success_rate mean_time_seconds
#> 1 1.0 30 83.33333 37.77000
#> 2 2.0 30 56.66667 50.78667
#> 3 2.5 30 80.00000 57.61000
#> 4 3.0 30 60.00000 69.85000
#> 5 4.0 30 53.33333 84.34333
#> median_time_seconds mean_success_time_seconds mean_errors mean_satisfaction
#> 1 36.9 35.68800 0.2000000 5.200000
#> 2 46.5 46.08235 0.9000000 4.433333
#> 3 53.2 55.21250 0.7333333 4.566667
#> 4 69.9 65.28889 0.9666667 3.766667
#> 5 84.2 76.38750 0.9666667 3.366667
#>
#> $by_experience
#> participant_experience observations success_rate mean_time_seconds
#> 1 Advanced 50 76 54.200
#> 2 Beginner 50 64 61.978
#> 3 Intermediate 50 60 64.038
#> median_time_seconds mean_success_time_seconds mean_errors mean_satisfaction
#> 1 51.55 51.50000 0.70 4.66
#> 2 59.60 56.60938 0.74 3.90
#> 3 60.70 54.32000 0.82 4.24
#>