WEBVTT captioned by daniel molina, checked by sachac
NOTE Introduction
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Welcome everybody. My name is Daniel Molina
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and I'm going to give this talk
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"Who needs Excel? Managing your students' qualifications
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with Org-table".
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I'm a professor. I work every day.
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I have to qualify my students.
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While most would consider normal in this situation,
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would be to use Excel or LibreOffice
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for doing that.
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However, I think that approaching it from Emacs
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has several interesting advantages.
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First, I would like to write the qualification
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next to the justification, next to the student error,
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and in the Excel format, it's not comfortable to do that.
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Actually, I always prefer to write in Emacs
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for many reasons, as many of you.
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Also, I love text format because I can compare versions
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using a control version system like Git and easily change.
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This is very useful for the revision period
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in which a student visits me
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and maybe I can change the qualification for any reason.
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I also can export the results directly to PDF
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to publish them in my online campus for the student.
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I have many tools for doing that.
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I already knew about Org-table formula.
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I thought it was very cool and useful
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to use Emacs for that,
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and I have actually found a package `orgtbl-aggregate`
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that seemed adequate for doing that.
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Unfortunately, I didn't see a lot of information
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about how to do that in a painless way.
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So, I have to learn, training and testing,
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and then prepare these tools to solve that problem
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and to help other teachers.
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Anyway, it could be used not only for teaching
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but for more contexts.
NOTE Demonstration
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Well, let's start.
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First, I have two sections,
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the comments and the section of the table, or results.
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I have... The comment for each student
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is in a different headline.
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It's very useful to check with a note.
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I can go directly using your helm or ivy
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or consult to go directly to the section.
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So it's very nice.
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Then I put the comment, right, completely wrong,
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it answers other questions.
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I put other comments here that I could send to the student,
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you can imagine, and then
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I can put the qualification, the score for each student.
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The thing with that is, initially,
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when I started doing that, I put, I don't know,
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the exception and a qualification with that.
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Okay, that's one point, this a three,
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and use a column total with something like that.
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Okay, that's nice.
NOTE Range
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But then, when I started getting more and more parts,
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I considered it more useful to use,
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to put for each part,
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which is the maximum qualification,
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on the range of the qualification.
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In that case, I'm going to put,
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the first one is two scores, the second three points,
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the third one is one point, and the last one, four points.
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And instead of putting that in that way,
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I like to put one is completely right,
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zero is completely wrong, or maybe some intermediate values for that.
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Of course, I have to change the qualification,
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the formula, so it's very simple.
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I only have to put,
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multiply the values of the second line with that.
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So, it's very useful for doing that.
NOTE More qualifications
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Okay, that's the first part, so I can put the comment,
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I can go to the section, I can create...
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I'm going to put more qualifications.
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Now I'm going to put the table.
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First I'm going to change, rename the column name,
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because it's easier when there is only one word.
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And it's very simple to use. You only have to put
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the name, aggregate, the name of the table,
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in that case group A,
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and in another string, the columns.
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For instance, name, surname, total.
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And you can see that you can get a lesson list
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with all the students,
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but only with the final score to publish them.
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Okay?
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Even you can update the name of the column,
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not in the original table,
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but in the lesson table using that format.
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Okay?
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That is a good option.
NOTE Subsets
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Now we are going to see how can we use that
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to make a subset of the students.
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For instance, imagine, this is me,
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I'm going to put the bad, I change, now I can update,
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you can see this, but also I'm going to put a list
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with the students that have failed the exam.
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It's simple, because this package has the option `:cond`.
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I'm going to put first to see it better,
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I'm going to put a condition
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in which we aggregate less than a half, 5,
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and I have to use a `string-to-number` total.
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In that way, I can see that this is the student
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that has failed the exam,
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I could use that to make another table,
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this is the people that passed the exam.
NOTE Sorting
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Another interesting feature is that
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I can... the lesson table can be sorted automatically.
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It's simple. You only have to put this symbol (`^`),
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and you can put next to the column you want
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to use for the sort, and then you can put
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`a` if you want to sort alphabetically,
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in uppercase if you want to reverse the sort,
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and `n` if you want to sort numerically.
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For instance, I can put that
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from the lesser score to the best score,
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or here from the best score to the lesser score.
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And this sort is completely independent
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to the sort of the original table.
NOTE New table
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Now I'm going to do another different thing,
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we are going to put a new table,
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I'm going to put a new table
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in which I'm going to put
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the number of passed students, failed students
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and the ratio of students. It's simple.
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I'm going to put the pass, in that case, as column,
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I can put the count, of course, I can put the count,
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the number of students
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that have passed, so I'm going to put in that way, ok?
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I'm going to put pass, count, failed, ratio.
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You can see, ok?
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But this only the count,
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you are going to put the number wrong.
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So, it's true, but you can actually put formula here.
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For instance, you can say,
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I know that I have 3 students,
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so the number of failed is 3 minus the passed student.
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And also, I can put the formula, is the people,
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the students that passed,
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divide into the number total of students, ok?
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Let's go to put that in that way,
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is the people that passed, it is better in that way,
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and also I can put directly the number of,
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the ratio of students.
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So, in that way, I can have a table
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with the students that passed,
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the students that failed
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and the ratio of people that passed.
NOTE Statistics
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Sometimes this type of qualification will be useful for me,
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to see how much has been the sound,
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how much good has been the exercise.
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Now, I'm going to put a new table.
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This new table is going to go some statistics,
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`statistics_score`, `begin: aggregate :table "final"`.
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In this case, I'm going to use not the original table,
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but a final, I'm going to put `final_group`,
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`final_p1`, `final_p2`, ok?
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And as `:cols`, I'm going to put directly
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how many results I have, I put number,
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I'm going to put also the mean.
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You can see that mean total is not working
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because I'm using this table and I renamed,
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the column name was renamed,
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so it's `mean(Score)`, mean,
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and then the score. You can obtain `stdiv` -- `sdev`,
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sorry, there was an error about that,
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and two decimal,
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and that is another interesting score.
NOTE Combining
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Now, I'm going to finish showing how we can use.
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To finish it, we are going to see
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how we can combine several tables
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or even an aggregated table in a new table.
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For instance, you can have a table for the practice 1,
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you can have a table for the practice 2,
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so I'm going to do that.
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I'm going to move this table. You can copy or remove,
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doesn't matter the order,
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I'm going to put this to identify the result of practice 2,
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Org create an ID (`org-id-get-create`),
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then we have a previous result,
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and I have a final table.
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The final table could be complicated,
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but it's not so much complicated, it's only that,
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I'm going to put something that the formula wants.
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The formula is to make
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an `org-lookup-first` of the second name,
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considering that it's unique,
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`remote` of the surname,
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and let's say another `remote` of the `$3` element,
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ok, that's an error because I don't put yet the ID,
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so I'm going to copy -- mark and copy --
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and paste the unique ID generated,
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I'm going to put that... I think there is missing one.
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Finally. Okay, that's right.
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So imagine that I change something here, for instance,
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I put... I change that,
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actually, this is changed also, and this is changed.
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This is a good way to divide the classification
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in several files, one for the practice 1,
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one for the practice 2, and one final practice
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that I can finally export in a final table.
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Of course you can make it a lot more pretty,
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but this is all I want to show you.
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I hope with this talk
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you have learned a lot more about Org formula,
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[orgtbl-aggregate] package,
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and how you can use all this techniques
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to improve your qualification of a student,
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or for whatever you want.
