Stratum ID
22 = 22
23 = 23
61 = 61
63 = 63
65 = 65
67 = 67
69 = 69

1 = 1
2 = 2
3 = 3
4 = 4
5 = 5
6 = 6
7 = 7
8 = 8
9 = 9
10 = 10
11 = 11
12 = 12
13 = 13
14 = 14
15 = 15
16 = 16
17 = 17
18 = 18
19 = 19
20 = 20
21 = 21
22 = 22
23 = 23
24 = 24
25 = 25
26 = 26
27 = 27
28 = 28
29 = 29
30 = 30
31 = 31
32 = 32
33 = 33
34 = 34
35 = 35
103 = 103
203 = 203

10 = FR
22 = VD
23 = VS
24 = NE
25 = GE
26 = JU

Tracking - Gender
1 = Female
2 = Male
9 = Mis

Mother - Q4a
1 = Yes
2 = No

Older - Q5a
1 = None
2 = One
3 = Two
4 = Three
5 = Four or more

Mother currently doing -Q6
1 = Working full-time
2 = Working part-time
3 = Looking for job
4 = Other

Mother's secondary educ - Q12
1 = Didn't go to school
2 = Completed (level 1)
3 = Completed (level 2)
4 = Completed (level 3B or 3C)
5 = Completed (level 3A)

Country of birth, self - Q16a
1 = <Country of Test>
2 = Other

Country of birth, self - Q16b
1 = Switzerland
2 = Germany or Austria
3 = France or Belgium
4 = Italy
5 = Spain
6 = Portugal
7 = Former Yugoslavia
8 = Albania or Kosovo
9 = Turkey
10 = other country
88 = M/R
99 = Mis

Language at home - Q17
1 = <Test language>
2 = <Other official languages>
3 = <National Dialect>
4 = <Other Languages>

Language at home - Q17
1 = Swiss German
2 = German
3 = French
4 = Ticino dialect or dialect of the Italian region
5 = Italian
6 = Romanch
7 = Spanish
8 = Portugese
9 = southern Slavis
10 = Albanian
11 = Turkish
12 = English
13 = other language
88 = M/R
99 = Mis

Movies - Q18a
1 = Never
2 = 1 or 2 times a year
3 = 3 or 4 times a year
4 = More 4 times a year

Discuss politics - Q19a
1 = Never
2 = Few times/year
3 = Once a month
4 = Several times/month
5 = Several times/week
7 = N/A
8 = M/R
9 = Mis

Phone - Q22a
1 = None
2 = One
3 = Two
4 = 3 or more

<Extension> - Q23a
1 = Never
2 = Some
3 = Regular
7 = N/A
8 = M/R
9 = Mis

section cantonale
1010 = FR_Prégymnasiale
1011 = FR_générale
1012 = FR_pratique
2210 = VD_voie sec. baccalauréat
2211 = VD_voie secondaire générale
2212 = VD_voie sec. à options
2310 = VS_collège
2311 = VS_intégré
2410 = NE_maturité
2411 = NE_moderne
2412 = NE_préprof
2510 = GE_latine
2511 = GE_scientifique
2512 = GE_moderne
2513 = GE_générale
2514 = GE_hétérogène
2615 = JU_hétérogène

section gymnasiale
1 = profil menant à la matu
2 = autre profil
3 = système hétérogène

Teachers wait long time - Q26a
1 = Never
2 = Some lessons
3 = Most lessons
4 = Every lesson
7 = N/A
8 = M/R
9 = Mis

Number in < test language> - Q27a
0 = 0
1 = 1
2 = 2
3 = 3
4 = 4
5 = 5
6 = 6
7 = 7
8 = 8
9 = 9
10 = 10
11 = 11
12 = 12
13 = 13
14 = 14
15 = 15
17 = 17

Number in Mathematics - Q27b
0 = 0
1 = 1
2 = 2
3 = 3
4 = 4
5 = 5
6 = 6
7 = 7
8 = 8
9 = 9
10 = 10
11 = 11
12 = 12
13 = 13
17 = 17

Number in Science - Q27c
0 = 0
1 = 1
2 = 2
3 = 3
4 = 4
5 = 5
6 = 6
7 = 7
8 = 8
9 = 9
10 = 10
11 = 11
12 = 12

In < test language> - Q28a
3 = 3
4 = 4
5 = 5
6 = 6
7 = 7
8 = 8
9 = 9
10 = 10
11 = 11
12 = 12
13 = 13
14 = 14
15 = 15
16 = 16
17 = 17
18 = 18
19 = 19
20 = 20
21 = 21
22 = 22
23 = 23
24 = 24
25 = 25
26 = 26
27 = 27
28 = 28
29 = 29
30 = 30
32 = 32
45 = 45

In Mathematics - Q28b
2 = 2
4 = 4
5 = 5
6 = 6
7 = 7
8 = 8
9 = 9
10 = 10
11 = 11
12 = 12
13 = 13
14 = 14
15 = 15
16 = 16
17 = 17
18 = 18
19 = 19
20 = 20
21 = 21
22 = 22
23 = 23
24 = 24
25 = 25
26 = 26
27 = 27
28 = 28
29 = 29
30 = 30
33 = 33
34 = 34

In Science - Q28c
0 = 0
2 = 2
3 = 3
4 = 4
5 = 5
6 = 6
7 = 7
8 = 8
9 = 9
10 = 10
11 = 11
12 = 12
13 = 13
14 = 14
15 = 15
16 = 16
17 = 17
18 = 18
19 = 19
20 = 20
21 = 21
22 = 22
23 = 23
24 = 24
25 = 25
26 = 26
27 = 27
28 = 28
29 = 29
30 = 30
34 = 34
56 = 56

Miss school - Q29a
1 = None
2 = 1 or 2
3 = 3 or 4
4 = 5 or more

Well with students - Q30a
1 = Strongly disagree
2 = Disagree
3 = Agree
4 = Strongly agree
7 = N/A
8 = M/R
9 = Mis

I complete on time - Q32a
1 = Never
2 = Smtime
3 = Mostly
4 = Always

Homework <test lang> - Q33a
1 = No time
2 = < 1 h/week
3 = 1 to 3 h/week
4 = > 3 h/week
7 = N/A
8 = M/R
9 = Mis

Read each day - Q34
1 = Don't read
2 = 30 min or less
3 = 31- 60 min
4 = 1-2 hours
5 = More than 2 hours

Magazines - Q36a
0 = 1 never or 2 a few times a year
1 = 3 about a month,4 sev times a month, 5 s. tms a week

How many books at home - Q37
1 = None
2 = 1-10
3 = 11-50
4 = 51-100
5 = 101-250
6 = 251-500
7 = More than 500

Borrow books - Q38
1 = Never
2 = Few times/year
3 = Once a month
4 = Several times/month

How often use school library - Q39a
1 = Never
2 = Few times/year
3 = Once/month
4 = Several times/month
5 = Several times/week
7 = N/A
8 = M/R
9 = Mis

Mark in <test lang> - Q41nominal
1 = Above
2 = At the mark
3 = Below

Next year's activity - Q42
1 = Grade 8 or 9 (still compulsory)
2 = Additional school year
3 = Additional school year in another language region
4 = Practical training year
5 = Apprenticeship
6 = Basic vocational training
7 = Pre-vocational training
8 = Kindergarten or primary teacher-training school
9 = Commercial / Vocational school
10 = Intermediate diploma school
11 = School preparing for the University entrance certificate
12 = Other education
13 = Payed Job
14 = Other activity
15 = Don't know yet
88 = M/R
99 = Mis

Activity certain? - Q43
1 = Yes
2 = No
3 = No, waiting for an answer
88 = M/R
99 = Missing

Entrance examin? - Q44
1 = No entrance exams necessary
2 = Yes, entrance exams already passed
3 = Yes, entrance exams not done yet
4 = Waiting for results of entrance exams
88 = Unallocated
99 = Mis

Desired activity? - Q45a
1 = Yes
2 = No
8 = M/R
9 = Mis

applied at how many schools? - Q46a
88 = M/R
99 = Mis

At home - IT1a
1 = Every day
2 = Few times / week
3 = 1-4 / month
4 = < 1 / Month
5 = Never

Using - IT2a
1 = Very
2 = Just
3 = Somewhat
4 = Not at all

Compare - IT3
1 = Excellent
2 = Good
3 = Fair
4 = Poor

Memorise - CC1/1
1 = Never
2 = Some
3 = Often
4 = Always

Math absorbed - CC2/29
1 = Disagree
2 = Disagree some
3 = Agree some
4 = Agree

Number of minutes per week in language courses
0 = 0
45 = 45
50 = 50
90 = 90
100 = 100
135 = 135
150 = 150
160 = 160
180 = 180
194 = 194
200 = 200
225 = 225
240 = 240
250 = 250
270 = 270
280 = 280
288 = 288
300 = 300
315 = 315
336 = 336
350 = 350
360 = 360
384 = 384
388 = 388
400 = 400
405 = 405
450 = 450
485 = 485
495 = 495
500 = 500
540 = 540
582 = 582
585 = 585
600 = 600
630 = 630
675 = 675
679 = 679
765 = 765

Number of minutes per week in mathematics courses
0 = 0
45 = 45
50 = 50
90 = 90
100 = 100
120 = 120
135 = 135
150 = 150
160 = 160
180 = 180
200 = 200
225 = 225
240 = 240
250 = 250
270 = 270
288 = 288
291 = 291
300 = 300
315 = 315
320 = 320
336 = 336
350 = 350
360 = 360
388 = 388
400 = 400
405 = 405
450 = 450
485 = 485
495 = 495
500 = 500
540 = 540
582 = 582
585 = 585
600 = 600
679 = 679
765 = 765

Number of minutes per week in science courses
0 = 0
45 = 45
50 = 50
80 = 80
90 = 90
96 = 96
97 = 97
100 = 100
120 = 120
135 = 135
150 = 150
160 = 160
180 = 180
194 = 194
200 = 200
225 = 225
250 = 250
270 = 270
288 = 288
300 = 300
315 = 315
360 = 360
400 = 400
405 = 405
450 = 450
495 = 495
540 = 540
550 = 550
600 = 600

Family structure
1 = Single
2 = Nuclear
3 = Mixed
4 = Other

Number of siblings
0 = 0
1 = 1
2 = 2
3 = 3
4 = 4
5 = 5
6 = 6
7 = 7
8 = 8
9 = 9
10 = 10
11 = 11
12 = 12
13 = 13
14 = 14
15 = 15
16 = 16
17 = 17
18 = 18
19 = 19
20 = 20
23 = 23
24 = 24

Birth oder
0 = 0
1 = 1
2 = 2
3 = 3

Father ISCED qualification
1 = 1
2 = 2
3 = 3
4 = 4
5 = 5
6 = 6

Patental Social interest
-0.75 = -0.75
0.13 = 0.1300000000000000044
-2.58 = -2.580000000000000071
-0.56 = -0.5600000000000000533
0.58 = 0.57999999999999996
-1.16 = -1.15999999999999992
1.2 = 1.199999999999999956
-1.2 = -1.199999999999999956
-3.65 = -3.649999999999999911
0.04 = 0.04000000000000000083
1.03 = 1.030000000000000027
-0.08 = -0.08000000000000000166
-1.53 = -1.530000000000000027
-2.3 = -2.299999999999999822
-0.09 = -0.08999999999999999667
-0.72 = -0.7199999999999999734
-0.55 = -0.5500000000000000444
-1.6 = -1.600000000000000089
-0.42 = -0.4199999999999999844
-0.84 = -0.8399999999999999689
-1.18 = -1.179999999999999938
-1.43 = -1.429999999999999938
-1.93 = -1.929999999999999938
-1.22 = -1.219999999999999973
0.44 = 0.4400000000000000022
-0.8799999999999999 = -0.8800000000000000044
-0.45 = -0.4500000000000000111
-0.9 = -0.9000000000000000222
-1.34 = -1.34000000000000008
-2.18 = -2.18000000000000016
-1.38 = -1.379999999999999893
-0.9599999999999999 = -0.9599999999999999645
-1.67 = -1.669999999999999929
-1.92 = -1.919999999999999929
-1.71 = -1.709999999999999964

Home educational resources
-1.5 = -1.5
-2 = -2
-1.54 = -1.540000000000000036
-2.08 = -2.080000000000000071
-1.33 = -1.330000000000000071
0.2700000000000001 = 0.2700000000000000178
-0.56 = -0.5600000000000000533
0.6 = 0.5999999999999999778
-0.8700000000000001 = -0.8699999999999999956
0.64 = 0.6400000000000000133
-1.82 = -1.820000000000000062
-0.72 = -0.7199999999999999734
-2.21 = -2.209999999999999964
0.76 = 0.7600000000000000089
-0.19 = -0.1900000000000000022
-2.79 = -2.790000000000000036
-2.28 = -2.279999999999999805
0.42 = 0.4199999999999999844
0.6299999999999999 = 0.6300000000000000044
-1.51 = -1.510000000000000009
-0.65 = -0.6500000000000000222
0.46 = 0.46000000000000002
-2.68 = -2.68000000000000016
-0.69 = -0.6899999999999999467
-5.93 = -5.929999999999999716
0.73 = 0.7299999999999999822
-1.21 = -1.209999999999999964
-3.42 = -3.419999999999999929
-4.34 = -4.339999999999999858

Cultural activities of students
0.52 = 0.5200000000000000178
1.29 = 1.290000000000000036
1.87 = 1.870000000000000107
1.16 = 1.15999999999999992
2.57 = 2.56999999999999984
1.45 = 1.449999999999999956
0.89 = 0.8900000000000000133
1.53 = 1.530000000000000027
2.56 = 2.560000000000000053
-0.16 = -0.1600000000000000033
-1.28 = -1.280000000000000027
1.65 = 1.649999999999999911
2.05 = 2.049999999999999822
-0.09 = -0.08999999999999999667
1.23 = 1.229999999999999982
2.21 = 2.209999999999999964
0.55 = 0.5500000000000000444
2.36 = 2.359999999999999876
-1.26 = -1.260000000000000009
0.65 = 0.6500000000000000222
1.55 = 1.550000000000000044
1.8 = 1.800000000000000044
1.59 = 1.59000000000000008
2.18 = 2.18000000000000016
2.93 = 2.93000000000000016
0.69 = 0.6899999999999999467
-0.69 = -0.6899999999999999467
-0.94 = -0.9399999999999999467
-0.9599999999999999 = -0.9599999999999999645
1.92 = 1.919999999999999929
0.73 = 0.7299999999999999822
0.98 = 0.9799999999999999822
-0.73 = -0.7299999999999999822

Cultural possession of the family
-0.26 = -0.2600000000000000089
-1.16 = -1.15999999999999992
-0.3 = -0.2999999999999999889
-0.6200000000000001 = -0.6199999999999999956
0.64 = 0.6400000000000000133
1.15 = 1.149999999999999911
-1.65 = -1.649999999999999911
0.97 = 0.9699999999999999734
-0.19 = -0.1900000000000000022
0.40999999999999986 = 0.4099999999999999756
0.57 = 0.5699999999999999512
-1.43 = -1.429999999999999938
0.86 = 0.8599999999999999867
0.9 = 0.9000000000000000222
-1.34 = -1.34000000000000008
-0.94 = -0.9399999999999999467
0.12 = 0.1199999999999999956
-1.46 = -1.459999999999999964