Statistics for 2007 Semester 1

This Page shows some statistics from the 2007 Semester 1 allocations

Click Here for 2007 Semester 2 Statistics

After the 1st Allocation

"#options" is the number of options the preferences where against.
ie if there is only one option then you would expect every one to get their 1st preference

got 1st, got 2nd etc is the % students that entered and got that preference.

got 123 is the % that entered preferences and that got their 1st, 2nd or 3rd preference.
This is one of the important measurers of OLCR's success in allocating students.

Total Prefs  is the total number of allocations from students that entered against groups with that number of options
Note all %age show are against this number, not the total number of allocations.

without Prefs is the total number of allocations without preferences (from Student connect/Callista enrolment).

Total  is the total allocations for groups with that number of allocations.

Additional coments.

Some times classes are canceled after student preference entry has started.
This results in students having higher preferences than the number of options.

eg 3 Tutes. A student enters preferences Tute 1 - 1st preference, Tute 2 - 2nd Preference, Tute 3 - 3rd Preference.
Tute 1 is then canceled and later on the student is allocated to their 3rd Preference.
Because the Tute 1 was canceled the # of options drops from 3 to 2.
This is also why a 0 #options line appears.

The reason that less students get a good preference with increasing #options is

1) Many of the options might be against the same time slot.
    If a student puts multiple preferences against a particular time slot and then can not attend them because they are allocated that spot in another unit.

2) Although the number of options goes up, students have only 8 preferences and tend to put them against the same sub set of options. Those classes fill up and the rest fail to get their preference. Getting students to enter more than 8 preferences is not deemed as practical. To counter this problem OLCR breaks preference choices up into popular and unpopular and forces half the preferences to be placed against unpopular times. OLCR also displays a measure of each options popularity in red.

3) There are less classes with lots of options and hence the statistics are being taken from a smaller sample of units.
This means that the layout of classes and the clash relationships between units can have a bigger impact on the result.

4) A large number of options might be at un-popular times.

An Example

The row with #options 18 is being heavily affected by one unit.

A student got his 5th preference and wants to know why.

I have added this student's preferences on the far right.

The Limit column is the maximum class size allowed.
1st,2nd,... etc are the numbers of 1st preferences, 2nd preference etc. Some are red to indicate that the preference count is greatet than the class mamimum allowed.

For this student it can be seen that his 1st preference was against a class that only held 16 students yet had 40 first preferences, 44 second preference, 34 third preference and so on. His chances of getting this class is at best 1 in 40.
OLCR puts the avoidance of timetable clashes before preferences. There would be students that have to attend this class in order to avoid clashes with other classes in another units. So in fact his chances are less than this (unless he also needs this class to avoid a clash)

Likewise for his 2nd,3rd and 4th preferences.
His 5th preference is the first unpopular class and because of the low number of 1st,2nd and 3rd preferences he got it.

It should be noted that despite half of the classes being very unpopular, 71% of students still got their 1st,2nd or 3rd preference.