[samigo-team] [Building Sakai] Loss of precision when instructor exports the assessment's results

[Sanghyun S. Jeon]

Thank you for your explanation.

S

From: samigo-team-bounces at collab.sakaiproject.org [mailto:samigo-team-bounces at collab.sakaiproject.org] On Behalf Of Karen Tsao
Sent: Friday, November 15, 2013 3:08 PM
To: Sanghyun Jeon
Cc: sakai-dev; Samigo Team
Subject: Re: [samigo-team] [Building Sakai] Loss of precision when instructor exports the assessment's results

Hi Sanghyun,
No one has looked into Raul's issue yet. And so there is no fix for that scenario. If you have the same scenario as what Raul has, you will still have loss precision problem.
As Samigo also has export feature, just to clarify, the fix for SAM-1562 is in Gradebook. The Gradebook export, not Samigo.
Thanks,
Karen

On Fri, Nov 15, 2013 at 2:34 PM, Sanghyun Jeon <euksa99 at gmail.com<mailto:euksa99 at gmail.com>> wrote:
We plan to use Sakai 2.9.3 Next semester. During our test, we find out that Sakai 2.9.3 still has the described issue of SAM 1562. Would you mind confirming this?
Thank you in advance.

S

On Mon, Oct 7, 2013 at 6:16 AM, Neal Caidin <neal.caidin at apereo.org<mailto:neal.caidin at apereo.org>> wrote:
Hi Raúl,


Does this look like the issue?

https://jira.sakaiproject.org/browse/SAM-1562

Looks like it was fixed in 2.9.0 . Which version are you seeing this problem on?

Cheers,
Neal


Neal Caidin
Sakai CLE Community Coordinator
neal.caidin at apereo.org<mailto:neal.caidin at apereo.org>
Skype: nealkdin
Twitter: ncaidin








On Oct 7, 2013, at 2:50 AM, RAUL SANCHEZ VEGAS <raulsv at um.es<mailto:raulsv at um.es>> wrote:

Hi all

We have found an issue related to the loss of precision in the final scores.

Steps to reproduce the issue:

1. The instructor publishes the assessment called "Assessment"(attached to this mail).
2. The student answers all questions correctly:

    3 questions: Every question worth 2 points so the student gets 6 points as total score.

3. The instructor exports the results to an excel file.(using button 'Export').
4. The total score is 5.999999 instead of 6 points in the excel file. The final score is displayed correctly: 6 points on the "Total Scores"  web page.

This loss of precision only happens sometimes.

It happens in Sakai 2.9.x too(http://qa1-nl.sakaiproject.org/portal/): Samigo uses float precision in 2.9.x instead of double precision as Samigo does in trunk.

At this example the final score is 6 on the "Total Scores" web page while the final score is 5.9999 in the Excel file. The reason is that the final score is rounded by the method
[samigo-app]AgentResults.getRoundedFinalScore()  on "Total Scores" web page while the final score is not rounded in the Excel file.

Should it be opened a new Jira with this issue?

Regards
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