Test taker stats
This data source provides test taker-level CTT metrics summarising overall performance on the test. It is based on submitted data.
| Column | Description | Example |
|---|---|---|
item_bank_id | ID of the Item Bank that this item belongs to. | 137279203 |
| item_bank_name | Name of the Item Bank that this item belongs to. | Demo item bank |
assessment_run_id | The ID of the assessment run (i.e specific test). Each assessment has a unique This ID is a combination of a set of questions, a specific time when this assessment is run, and a group of users that are taking this test. | 137465023 |
assessment_start_time | Timestamp of assessment run’s start time. This is not the individual start time for each test taker, often all test takers who took the same assessment have the same | 2025-12-04T07:00:00.000Z |
assessment_end_time | Timestamp of assessment run’s end time. This is not the individual end time for each test taker, often all test takers who took the same assessment have the same | 2025-12-04T07:35:00.000Z |
user_id | ID of the test taker who made a submission for the assessment. | 137465032 |
global_person_id | A unique identifier that allows us to identify the user across different test sittings in the Inspera platform | 1357554-137465032 |
user_external_id | External ID for the user | 137465032 |
user_assessment_id | ID for the user's assessment instance | 9939406 |
run_identifier | Unique identifier for the run | 2a88a5a9-42c3-4d5a-b938-3fe68832fc92 |
test_taker_total_score | The total score attained by a test taker on the assessment. | 3 |
row_timestamp | The time of which this record was generated. Upon conflicts the record with the latest row_timestamp will always be used. Format is | 2025-12-04T07:42:43.783Z |
Item stats
This data source provides the core CTT item-level metrics, allowing for detailed psychometric evaluation of every question and response interaction.
| Column | Description | Example |
|---|---|---|
| ID of the Item Bank that this item belongs to. | 137279203 |
| Name of the Item Bank that this item belongs to. | Demo item bank |
| The ID of the assessment run (i.e specific test). Each assessment has a unique This ID is a combination of a set of questions, a specific time when this assessment is run, and a group of users that are taking this test. | 137465023 |
| Unique identifier for the run | 2025-12-04T07:00:00.000Z |
| ID for the section content item | 2025-12-04T07:35:00.000Z |
| The unique ID for the question | 137456120 |
| ID for the measure | 909486 |
| ID for the response variable interaction | RESPONSE |
| Identifier for the interaction response | RESPONSE |
| The type of the question (e.g. multiple choice) | content_question_qti2_multiple_choice |
| The order of the question | 3 |
| The order of the interaction within the question | 1 |
| Number of test takers who have seen the question, regardless of whether they answered. | 2a88a5a9-42c3-4d5a-b938-3fe68832fc92 |
| Number of test takers who answered the interaction. | 1 |
| Number of test takers who answered the question. A question is answered iif at least one of its interactions is answered. | 1 |
| Number of test takers who have seen the interaction but did not answer it. | 1 |
| Number of test takers who have seen the question but did not answer it. | 0 |
| Number of test takers who were supposed to see the question but did not. | 0 |
| Average time spent on a question, taking into account only exposed students | 0 |
| Theoretical Max score possible for the interaction. | 1 |
| Mean score obtained for the interaction. | 1 |
| Standard deviation of the scores obtained for the interaction. | 0 |
| Standard error of the mean score obtained for the interaction. | 0 |
| Facility of the interaction. It measures the proportion of students who answered a question correctly. Range between 0 and 1. | 1 |
| Standard error of the facility of the interaction. | 0 |
| Discrimination of the interaction. It measures how well the item discriminates between students of high and low ability. It ranges between -1 and 1. Negative or very low positive values may indicate that the question does not discriminate well between students of high and low ability. | 0 |
| Discrimination of the interaction corrected by removing the score of the present interaction from the total score. | 0 |
| Theoretical Max score possible for the question. | 1 |
| Mean score obtained for the question. | 1 |
| Standard deviation of the scores obtained for the question. | 0 |
| Standard error of the mean score obtained for the question. | 0 |
| Facility of the question. | 1 |
| Standard error of the facility of the question. | 0 |
| Discrimination of the question. | 0 |
| Discrimination of the question corrected by removing the score of the present question from the total score. | 0 |
row_timestamp | The time of which this record was generated. Upon conflicts the record with the latest row_timestamp will always be used. Format is | 2025-12-04T07:42:43.783Z |
Assessment stats
This data source provides reliability and score distribution metrics calculated at the overall test level. It provides essential evidence regarding the internal consistency and spread of scores for the entire assessment.
| Column | Description | Example |
|---|---|---|
| ID of the Item Bank that this item belongs to. | 137279203 |
| Name of the Item Bank that this item belongs to. | Demo item bank |
| The ID of the assessment run (i.e specific test). Each assessment has a unique This ID is a combination of a set of questions, a specific time when this assessment is run, and a group of users that are taking this test. | 137465023 |
| Timestamp of assessment run’s start time. This is not the individual start time for each test taker, often all test takers who took the same assessment have the same | 2025-12-04T07:00:00.000Z |
| Timestamp of assessment run’s start time. This is not the individual start time for each test taker, often all test takers who took the same assessment have the same | 2025-12-04T07:35:00.000Z |
run_identifier | Unique identifier for the specific calculation. | 2a88a5a9-42c3-4d5a-b938-3fe68832fc92 |
number_test_takers_enrolled | Number of test takers enrolled in an assessment. | 5 |
number_test_takers_submitted | Number of test takers who submitted the assessment. | 1 |
| Minimum score obtained on the assessment. | 3 |
| Maximum score obtained on the assessment. | 3 |
| Mean score obtained on the assessment. | 3 |
| Standard deviation of scores obtained on the assessment. | 0 |
| 1st percentile of the scores of all test takers who submitted this assessment. | 3 |
| 2nd percentile of the scores of all test takers who submitted this assessment. | 3 |
| 3rd percentile of the scores of all test takers who submitted this assessment. | 3 |
interaction_level_cronbach_alpha | Reliability calculated at the interaction level. | 0 |
question_level_cronbach_alpha | Reliability calculated at the question level. | 0 |
total_score_histogram.number_test_takers | List of the number of test takers (x axis) in a histogram plot of total score v/s number of test takers. | [0,0,0,1,0] |
total_score_histogram.total_score | List of the total score (y axis) corresponding to each item in the number of test takers list above. | [0,1,2,3,4] |
exposure_histogram.question_order | List of the question order (x axis) in a histogram plot of the exposure count v/s question order. | [1,2,3,4] |
exposure_histogram.exposure | List of the exposure count (y axis) corresponding to each item in the question order list above. Exposure count is the number of test takers who have viewed a question. | [1,1,1,1] |
answered_histogram.question_order | List of the question order (x axis) in a histogram plot of the answered count v/s question order. | [1,2,3,4] |
answered_histogram.answered | List of the answered count (y axis) corresponding to each item in the question order list above. Answered count is the number of test takers who have answered a question. | [1,1,1,1] |
omitted_histogram.question_order | List of the question order (x axis) in a histogram plot of the omitted count v/s question order. | [1,2,3,4] |
omitted_histogram.omitted | List of the omitted count (y axis) corresponding to each item in the question order list above. Omitted count is the number of test takers who have skipped a question. | [0,0,0,0] |
not_reached_histogram.question_order | List of the question order (x axis) in a histogram plot of the unexposed count v/s question order. | [1,2,3,4] |
not_reached_histogram.not_reached | List of the unexposed count (y axis) corresponding to each item in the question order list above. Unexposed count is the number of test takers who did not reach a question. | [0,0,0,0] |
facility_per_question_histogram.question_order | List of the question order (x axis) in a histogram plot of the question facility v/s question order. | [1,2,3,4] |
facility_per_question_histogram.facility | List of the question facility (y axis) corresponding to each item in the question order list above. | [1,1,1,0] |
discrimination_per_question_histogram.question_order | This is a list of the question order (x axis) in a histogram plot of the discrimination v/s question order. | [1,2,3,4] |
discrimination_per_question_histogram.discrimination | List of the question discrimination (y axis) corresponding to each item in the question order list above. | [0,0,0,0] |
facility_per_question_type_histogram.question_type | This is a list of the question types (x axis) in a histogram plot of the question facility v/s question type. | ["content_question_qti2_multiple_choice"] |
facility_per_question_type_histogram.facility | List of the question facility (y axis) corresponding to each item in the question type list above. | [0.75] |
mean_score_per_question_type_histogram.question_type | This is a list of the question types (x axis) in a histogram plot of the question mean score v/s question type. | ["content_question_qti2_multiple_choice"] |
mean_score_per_question_type_histogram.mean_score | List of the question mean score (y axis) corresponding to each item in the question type list above. | [0.75] |
facility_per_interaction_histogram.question_order | This is a list of the question order (x axis) in a histogram plot of the interaction facility v/s interaction order. | [1,2,3,4] |
facility_per_interaction_histogram.interaction_order_in_question | This is a list of the interaction order in each question (x axis) in a histogram plot of the interaction facility v/s interaction order. | [1,1,1,1] |
facility_per_interaction_histogram.facility | List of the interaction facility (y axis) corresponding to each item in the interaction order list above. | [1,1,1,0] |
discrimination_per_interaction_histogram.question_order | This is a list of the question order (x axis) in a histogram plot of the discrimination facility v/s interaction order. | [1,2,3,4] |
discrimination_per_interaction_histogram.interaction_order_in_question | This is a list of the interaction order in each question (x axis) in a histogram plot of the interaction discrimination v/s interaction order. | [1,1,1,1] |
discrimination_per_interaction_histogram.discrimination | List of the interaction discrimination (y axis) corresponding to each item in the interaction order list above. | [0,0,0,0] |
row_timestamp | The time of which this record was generated. Upon conflicts the record with the latest row_timestamp will always be used. Format is | 2025-12-04T07:42:43.783Z |