0 rows


Statistics for individual questions used in an activity.


Column Type Size Nulls Auto Default Children Parents Comments
id BIGINT 19 null
hashcode VARCHAR 40

sha1 hash of serialized qubaids_condition class. Unique for every combination of class name and property.

timemodified BIGINT 19 null
questionid BIGINT 19 null question_statistics_erd_question_idR
slot BIGINT 19 null

The position in the quiz where this question appears

subquestion SMALLINT 5 null
variant BIGINT 19 null
s BIGINT 19 0
effectiveweight DECIMAL 15,5 null
negcovar TINYINT 3 0
discriminationindex DECIMAL 15,5 null
discriminativeefficiency DECIMAL 15,5 null
sd DECIMAL 15,10 null
facility DECIMAL 15,10 null
subquestions LONGTEXT 2147483647 null
maxmark DECIMAL 12,7 null
positions LONGTEXT 2147483647 null

positions in which this item appears. Only used for random questions.

randomguessscore DECIMAL 12,7 null

An estimate of the score a student would get by guessing randomly.


Constraint Name Type Sort Column(s)
PRIMARY Primary key Asc id
question_statistics_erd_question_id Performance Asc questionid