Trends in International Mathematics and Science Study 2015

International, 2015

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Reference ID

int-iea-timss-2015-v1

Producer(s)

TIMSS & PIRLS International Study Center

Collections

TIMSS and PIRLS

Metadata

DDI/XML JSON

Created on

Mar 20, 2021

Last modified

Mar 20, 2021

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311382

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GEN\MONTHS OF EXTRA LESSONS\MATHEMATICS (ASBH10BA)

Data file: timss-2015-pop1-num-bg-hm-allcountries-metadata

Overview

Valid: 830

Invalid: 170

Type: Discrete

Decimal: 0

loc_start_pos: 74

loc_end_pos: 74

Width: 1

Range: 1 - 4

Format: Numeric

Questions and instructions

Categories

Value	Category	Cases
1	Did not attend	523	63%
2	Less than 4 months	171	20.6%
3	4-8 months	72	8.7%
4	More than 8 months	64	7.7%
Sysmiss		170

Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.

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