[gradebook2-dev] question about grading using letter grades

[Jim Mezzanotte]

Thanks Thomas. I was curious how these mappings were determined--I'm
assuming this is simply a hard-coded mapping, and not based on any
calculations in the tool? I noticed these mappings are used even if
you change the ranges of the letter grade scale before setting up the
gradebook for letter grades.

Best,
Jim Mezzanotte
rSmart

On Wed, Nov 21, 2012 at 11:15 AM, Thomas Amsler <tpamsler at ucdavis.edu> wrote:
> Jim,
>
> GB2 uses the following "letter grades" to "numeric values"mappings:
>
> A+      98.3333333333
> A       95
> A-      91.6666666666
> B+      88.3333333333
> B       85
> B-      81.6666666666
> C+      78.3333333333
> C       75
> C-      71.6666666666
> D+      68.3333333333
> D       65
> D-      61.6666666666
> F       58.3333333333
> 0       0
>
>
> 96.66 - 100     A+
> 93.33 - 96.66   A
> 90 - 93.33              A-
> 86.66 - 90              B+
> 83.33 - 86.66   B
> 80 - 83.33      B-
> 76.66 - 80      C+
> 73.33 - 76.66   C
> 70 - 73.33      C-
> 66.66 - 70          D+
> 63.33 - 66.66   D
> 60 - 63.33      D-
> <60             F
>
> Best,
> -- Thomas
>
>
> On Wed, Nov 21, 2012 at 7:04 AM, Jim Mezzanotte <jmezzanotte at rsmart.com>
> wrote:
>>
>> I think the question here (apologies if I'm wrong) is how the
>> gradebook arrives at a calculated grade when it's set up for entering
>> letter grades for items. If you use the default "letter grades"
>> format, you get the following ranges:
>>
>> A = 90 to 100
>> B = 80 to 89.99
>> C = 70 to 79.99
>> D = 60 to 69.99
>> F = 0 to 59.99
>>
>> Given these ranges, how does the tool determine the points for an
>> entered score?  If you enter "F" for an item (assuming item has 100
>> max pts)--and that is the only item graded--the calculated grade is
>> 58.333...  So the tool is determining a specific value for each range,
>> but it's not clear how. The midrange value for "F" would be 29.995. As
>> another example, the midrange value for "C" would be 74.995. Yet, if
>> you enter "C" for a single item, the calculated grade is 75.
>>
>> I'm not sure if the tool might be rounding up. You'll also see a
>> discrepancy between midrange value and calculated grade with the
>> default "letter grade with +/-" format. For example, if you enter "B-"
>> for a single item, the calculated grade is 81.666....  But, the
>> midrange value would be 80.995.
>>
>> Best,
>> Jim Mezzanotte
>> rSmart
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>
>