phd-thesis-evaluation

CSV-file with information about programming problem tasks (FullScaleStudies-Legend-VPL.csv)
CSV-file with information about programming problem tasks

Column	Description
UserID	Integer as user identification to differentiate students on the empirical studies
NroUSP	Integer as students identification to differentiate students on the school
startPX	Epoch unix time stamp in which the student with UserID started to solve the programming problem tasks with identification PX
corrPX	Correctness score of the programming problem task with identification PX
exatPX	Exact effective time in seconds spent by the student with UserID to solve the programming problem task with identification PX. Effective time is the window-time in seconds dedicated by the student inside the VPL editor.
PXs0	Guttman-based score for the programming problem task with identification PX and rule s0.
PXs1	Guttman-based score for the programming problem task with identification PX and rule s1.
PXs2	Guttman-based score for the programming problem task with identification PX and rule s2.
PXs3	Guttman-based score for the programming problem task with identification PX and rule s3.

rule s0: score(Q)

rule s1: score(Q x T50)

(0,x) = 0: when the solution is incorrect (Q=0) and the solving time is irrelevant
(1,0) = 1: when the solution is correct (Q=1) and the solving time is greater than the median (t>T55)
(1,1) = 2: when the solution is correct (Q=1) and the solving time is less than the median (t<T50)

rule s2: score(Q x T66 x T33)

(0,x,x) = 0: when the solution is incorrect (Q=0) and the solving time is irrelevant
(1,0,x) = 1: when the solution is correct (Q=1) and the solving time is greater than 66-th percentile (t>T66)
(1,1,0) = 2: when the solution is correct (Q=1) and the solving time is greater than 33-th percentile (t>T33)
(1,1,1) = 3: when the solution is correct (Q=1) and the solving time is less than 33-th percentile (t<T33)

rule s3: score(Q x T75 x T50 x T25)

(0,x,x,x) = 0: when the solution is incorrect (Q=0) and the solving time is irrelevant
(1,0,x,x) = 1: when the solution is correct (Q=1) and the solving time is greater than 75-th percentile (t>T75)
(1,1,0,x) = 2: when the solution is correct (Q=1) and the solving time is greater than the median (t>T50)
(1,1,1,0) = 3: when the solution is correct (Q=1) and the solving time is greater than 25-th percentile (t>T25)
(1,1,1,1) = 4: when the solution is correct (Q=1) and the solving time is less than 25-th percentile (t<T25)

Fixing `ERROR 2006 (HY000): MySQL server has gone away`?

mysql -u root -p
# enter password

mysql > SET GLOBAL max_allowed_packet=1073741824;

and add to /etc/my.cnf:

```

max_allowed_packet=128M