[LON-CAPA-users] questions about our first exam - partial marks

[Mills, Douglas G]

We have done something similar to your first challenge below by setting
the weight of the problem equal to a variable and setting the variable in
the Perl scrip at the head of the document based on how many tries have
been taken on the problem using the relevant EXT functions. I can provide
code examples if you¹d like.

Doug

Douglas Mills
Director of Instructional Technologies
Department of Chemistry
University of Illinois
dmills at illinois.edu
(217) 244-5739







On 2/2/14, 9:48 PM, "Joseph Mingrone" <jrm at mathstat.dal.ca> wrote:

>Hello,
>
>I've been asked to write an exam and I'm struggling with the request to
>assign students partial marks under certain conditions.
>
>The first condition is based on the number of tries the student takes to
>get the correct answer.  For example, if the student gets the correct
>answer on the second try (after a hint has been displayed) we would like
>to give her half the weight of the question.  Maybe the custom response
>problem is the way to go?  Maybe we're trying to force a square block
>into a round hole?  If you've done this, example code would be great.
>I've seen the post below, but the solution isn't clear to me.
>http://mail.lon-capa.org/pipermail/lon-capa-users/2012-August/004127.html
>
>The second condition is for an Option Response with a foil group.  The
>professor would like to assign 0.5 for each correct option chosen and
>-0.5 for each incorrect option chosen.
>
>After reading the author manual, this is my best guess.
>
>  <part id="assumptions">
>    <parameter name="maxtries" id="75" type="int_pos" default="1"
>description="Maximum Number of Tries" />
>    <parameter name="problemstatus" id="78" type="string_problemstatus"
>default="answer" description="Show Problem Status" />	
>    <startouttext />(g) Indicate the correct statements<endouttext />
>    <customresponse>
>      <optionresponse max="6" id="80" randomize="no"
>TeXlayout="horizontal">
>	<foilgroup checkboxvalue="True" options="('True','False')" noprompt="1"
>checkboxoptions="nochoice">
>	  <foil location="bottom" value="True" name="foil-ev">
>	    <parameter name="weight" id="94" type="float_pos" default="0.5"
>description="Weight" />
>            <startouttext />Statement 1<endouttext />
>	  </foil>
>	  <foil location="bottom" value="False" name="foil-es">
>            <startouttext />Statement 2<endouttext />
>	  </foil>
>	  <foil location="bottom" value="False" name="foil-n8">
>            <startouttext />Statement 3<endouttext />
>	  </foil>
>	  <foil location="bottom" value="True" name="foil-nd">
>            <startouttext />Statement 3<endouttext />
>	  </foil>
>	</foilgroup>
>      </optionresponse>
>      <answer type="loncapa/perl">
>       ### code here to check the indices of $$submission and add .5 for
>    each correct option chosen and subtract 0.5 for each incorrect option
>chosen... ###
>	return(ASSIGNED_SCORE,0.3);
>      </answer>
>    </customresponse>
>  </part>
>
>Thanks for any tips,
>
>Joseph
>
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