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| This page will be used to document and structure a project of adding multiquestion capability to the calculated question like the cloze questiontype and allowing the calculated questions to be used as usual calculated question or as multiplechoice question.
| | Working on it now. If you have ideas - you are welcome! |
| ==Intro==
| | General idea is: We have general set of variables and need to ask many questions related with some theory and this set of variables. |
| This imply developping a structure similar to the multiquestion
| |
| i.e adding calculated questions records with the main question as parent. An additional multiplechoice record is necessary to each calculated question.
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|
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| Actually (august 2007) the general interface to create and edit this improved calculated questiontype is almost completed.
| | Now I'm working about questions for financial field. Which has now up to 20 variables and up to 10 questions. |
| The real difficulties are to modify the code related to grade each subquestion and store the session and responses parameters.
| |
| If we only allowed single response multichoice question, the code will be a quite straightforward version of the multiquestion one.
| |
| ==Question Object structure==
| |
| Here is the proposed structure of the question object after calling get_question_options
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| records
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| *main mdl_question
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| ** for each subquestion an mdl_question with the parent field set to main->id
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| *** for each mdl_question record
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| **** a mdl_question_calculated and
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| **** a mdl_question_multichoice
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| The usual answers records for each question and subquestion
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| All the datasets, data_items records are associated with the main question
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| All these data are structure like the following example.
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| Probably to simplify the code the main question (#0) data will be repeated in the subquestions
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| stdClass Object
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| (
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| [category] => 1
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| [parent] => 0
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| [name] => my first multichoice
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| [questiontext] => What is the surface of a rectangle of {h} m by {l} m ?
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| {#0}
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| What is the perimeter of this rectangle?
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| {#1}
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| [questiontextformat] => 1
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| [image] =>
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| [generalfeedback] =>
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| [defaultgrade] => 1
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| [penalty] => 0.1
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| [qtype] => calculated
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| [length] => 1
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| [stamp] => 132.208.141.198+070613190851+gCcidQ
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| [version] => 132.208.141.198+070812043753+37cXs7
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| [hidden] => 0
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| [id] => 382
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| [maxgrade] => 1
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| [name_prefix] => resp382_
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| [options] => stdClass Object
| |
| (
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| [answers] => Array
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| (
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| [1141] => stdClass Object
| |
| (
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| [question] => 382
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| [answer] => {h}* {l}
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| [fraction] => 1
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| [feedback] => OK
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| [tolerance] => 0.01
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| [tolerancetype] => 1
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| [correctanswerlength] => 2
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| [correctanswerformat] => 1
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| [id] => 1141
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| )
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| [1142] => stdClass Object
| |
| (
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| [question] => 382
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| [answer] => 2*({h}+{l})
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| [fraction] => 0.5
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| [feedback] => You give me the perimeter !
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| [tolerance] => 0.01
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| [tolerancetype] => 1
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| [correctanswerlength] => 2
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| [correctanswerformat] => 1
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| [id] => 1142
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| )
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| [1143] => stdClass Object
| |
| (
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| [question] => 382
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| [answer] => {rr}
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| [fraction] => 0
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| [feedback] => Go back and try again
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| [tolerance] => 0.01
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| [tolerancetype] => 1
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| [correctanswerlength] => 2
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| [correctanswerformat] => 1
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| [id] => 1143
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| )
| |
| )
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| [multichoice] => stdClass Object
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| (
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| [id] => 257
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| [question] => 382
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| [layout] => 0
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| [answers] => 0
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| [single] => 1
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| [shuffleanswers] => 1
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| [correctfeedback] =>
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| [partiallycorrectfeedback] =>
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| [incorrectfeedback] =>
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| [answernumbering] => abc
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| )
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| [subquestions] => Array
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| (
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| [383] => stdClass Object
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| (
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| [category] => 1
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| [parent] => 382
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| [name] => {#1}
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| [questiontext] => {#1}
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| [questiontextformat] => 1
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| [image] =>
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| [generalfeedback] =>
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| [defaultgrade] => 1
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| [penalty] => 0.1
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| [qtype] => calculated
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| [length] => 1
| |
| [stamp] => 132.208.141.198+070613203735+MrdwQ3
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| [version] => 132.208.141.198+070812043754+Os3B8Z
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| [hidden] => 0
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| [id] => 383
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| [options] => stdClass Object
| |
| (
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| [answers] => Array
| |
| (
| |
| [1144] => stdClass Object
| |
| (
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| [question] => 383
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| [answer] => 2*({h}+{l})
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| [fraction] => 1
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| [feedback] => OK 1
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| [tolerance] => 0.01
| |
| [tolerancetype] => 1
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| [correctanswerlength] => 0
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| [correctanswerformat] => 1
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| [id] => 1144
| |
| )
| |
| )
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| [multichoice] => stdClass Object
| |
| (
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| [id] => 258
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| [question] => 383
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| [layout] => 0
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| [answers] => 0
| |
| [single] => 0
| |
| [shuffleanswers] => 1
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| [correctfeedback] =>
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| [partiallycorrectfeedback] =>
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| [incorrectfeedback] =>
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| [answernumbering] => abc
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| )
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| [units] => Array
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| (
| |
| )
| |
| )
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| [editasmultichoice] => 0
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| )
| |
| )
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| [units] => Array
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| (
| |
| )
| |
| )
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| [editasmultichoice] => 0
| |
| )
| |
| ==Create and save sessions==
| |
| For calculated questions the '''answer''' field of the mdl_question_states record store the responses with the dataset number followed by the responses the two being separated by -
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| function save_session_and_responses(&$question, &$state) {
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| $responses = 'dataset'.$state->options->datasetitem.'-'.
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| $state->responses[''];
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| example 'dataset13-2916m2'
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| For multichoice questiontype
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| // The serialized format for multiple choice quetsions
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| // is an optional comma separated list of answer ids (the order of the
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| // answers) followed by a colon, followed by another comma separated
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| // list of answer ids, which are the radio/checkboxes that were
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| // ticked.
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| // E.g. 1,3,2,4:2,4 means that the answers were shown in the order
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| // 1, 3, 2 and then 4 and the answers 2 and 4 were checked.
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| For multianswer questiontype
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|
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|
| The format is similar to the calculated, the order of the questions followed by the responses the two being separated by - , each answer being separated by ,
| | But for example could be in Geometry field. '''Right circular cone''' which has ''variables'' such as r(base radius), h(height), <math>\theta</math>(aperture) |
| $responses = $state->responses;
| |
| // encode - (hyphen) and , (comma) to - because they are used as
| |
| // delimiters
| |
| array_walk($responses, create_function('&$val, $key',
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| '$val = str_replace(array(",", "-"), array(",", "-"), $val);
| |
| $val = "$key-$val";'));
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| $responses = implode(',', $responses);
| |
| this give answer value like 1-8,2-yes,3-1.23,4-15,5-12.
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|
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|
| To identify the subquestion and their corresponding answers, in the calculated question type we will use the question->id because the questions (#0,#1 etc.) can be placed everywhere in the text and possibly we could manage a rewowrking of this order in the case that one of the subquestion is dropped.
| | And ''many questions'' could be such as: |
| So each question and subquestions will be separated by , and the first term will be the question_id.
| |
| This should be coherent with the existing format. There is however a problem because actually there is no conversion of the - and , in the answer in the actual code.
| |
| Given that the answer can contain number and the units, almost any character can be present as typing error.
| |
|
| |
|
| We need a way to identify the new format.
| | 1. Calculate slant height s? (Formula <math>s=\sqrt{r^2+h^2} </math> ) |
|
| |
|
| The only real characteristic is the word '''dataset''' which could be used to identify records from preceeding calculated questiontype if we set new introductory word to the new questiontype. A spontaneous choice is to use DATASET instead of dataset.
| | 2. Calculate volume V? (Formula <math>V=1/3\cdot \pi\cdot r^2\cdot h </math> ) |
|
| |
|
| How do we decide in which format we encode the responses.
| | 3. Calculate surface area S? (Formula <math>S=\sqrt{\pi\cdot r\cdot s} </math> ) (depends on 1 question) |
| We need a flag from the question object for old type calculated questions that do not contain subquestions and do not have an associated multichoice record.
| | |
| if (isset($question->options->multichoice) && isset($question->options->questions) {
| | Forum discussion: Multipart calculated questions using students answers in calculating correct answers |
| proceed with the new encoding
| | [http://moodle.org/mod/forum/discuss.php?d=132225] |
| }else {
| |
| use the old one
| |
| }
| |
Working on it now. If you have ideas - you are welcome!
General idea is: We have general set of variables and need to ask many questions related with some theory and this set of variables.
Now I'm working about questions for financial field. Which has now up to 20 variables and up to 10 questions.
But for example could be in Geometry field. Right circular cone which has variables such as r(base radius), h(height), 
(aperture)
And many questions could be such as:
1. Calculate slant height s? (Formula 
)
2. Calculate volume V? (Formula 
)
3. Calculate surface area S? (Formula 
) (depends on 1 question)
Forum discussion: Multipart calculated questions using students answers in calculating correct answers
[1]
