Question Statistics Table Schema (question_statistics)


Statistics for individual questions used in an activity.

question_statistics table columns

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 Implied Constraint R
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.

Table contained -1 rows

question_statistics table indexes

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

question_statistics table relationships