+ <TABLE NAME="question_statistics" COMMENT="Statistics for individual questions used in an activity.">
+ <FIELDS>
+ <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true"/>
+ <FIELD NAME="hashcode" TYPE="char" LENGTH="40" NOTNULL="true" SEQUENCE="false" COMMENT="sha1 hash of serialized qubaids_condition class. Unique for every combination of class name and property."/>
+ <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false"/>
+ <FIELD NAME="questionid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false"/>
+ <FIELD NAME="slot" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="The position in the quiz where this question appears"/>
+ <FIELD NAME="subquestion" TYPE="int" LENGTH="4" NOTNULL="true" SEQUENCE="false"/>
+ <FIELD NAME="s" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
+ <FIELD NAME="effectiveweight" TYPE="number" LENGTH="15" NOTNULL="false" SEQUENCE="false" DECIMALS="5"/>
+ <FIELD NAME="negcovar" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
+ <FIELD NAME="discriminationindex" TYPE="number" LENGTH="15" NOTNULL="false" SEQUENCE="false" DECIMALS="5"/>
+ <FIELD NAME="discriminativeefficiency" TYPE="number" LENGTH="15" NOTNULL="false" SEQUENCE="false" DECIMALS="5"/>
+ <FIELD NAME="sd" TYPE="number" LENGTH="15" NOTNULL="false" SEQUENCE="false" DECIMALS="10"/>
+ <FIELD NAME="facility" TYPE="number" LENGTH="15" NOTNULL="false" SEQUENCE="false" DECIMALS="10"/>
+ <FIELD NAME="subquestions" TYPE="text" NOTNULL="false" SEQUENCE="false"/>
+ <FIELD NAME="maxmark" TYPE="number" LENGTH="12" NOTNULL="false" SEQUENCE="false" DECIMALS="7"/>
+ <FIELD NAME="positions" TYPE="text" NOTNULL="false" SEQUENCE="false" COMMENT="positions in which this item appears. Only used for random questions."/>
+ <FIELD NAME="randomguessscore" TYPE="number" LENGTH="12" NOTNULL="false" SEQUENCE="false" DECIMALS="7" COMMENT="An estimate of the score a student would get by guessing randomly."/>
+ </FIELDS>
+ <KEYS>
+ <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
+ </KEYS>
+ </TABLE>
+ <TABLE NAME="question_response_analysis" COMMENT="Analysis of student responses given to questions.">
+ <FIELDS>
+ <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true"/>
+ <FIELD NAME="hashcode" TYPE="char" LENGTH="40" NOTNULL="true" SEQUENCE="false" COMMENT="sha1 hash of serialized qubaids_condition class. Unique for every combination of class name and property."/>
+ <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false"/>
+ <FIELD NAME="questionid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false"/>
+ <FIELD NAME="subqid" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false"/>
+ <FIELD NAME="aid" TYPE="char" LENGTH="100" NOTNULL="false" SEQUENCE="false"/>
+ <FIELD NAME="response" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false"/>
+ <FIELD NAME="rcount" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false"/>
+ <FIELD NAME="credit" TYPE="number" LENGTH="15" NOTNULL="true" SEQUENCE="false" DECIMALS="5"/>
+ </FIELDS>
+ <KEYS>
+ <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
+ </KEYS>
+ </TABLE>