Trends in International Mathematics and Science Study 1999

World, 1999

Reference ID

WLD_1999_TIMSS_v01_M

Producer(s)

TIMSS International Study Center

Metadata

DDI/XML JSON

Created on

Apr 25, 2019

Last modified

Apr 25, 2019

Page views

1261

CSV JSON

total calls (q0007)

Data file: WHS-Ukraine_F2

Overview

Valid: 2311

Invalid: 500

Minimum: 1

Maximum: 8

Mean: 1.127

Standard deviation: 0.43

Type: Continuous

Decimal: 2

Range: -

Format:

Questions and instructions

Interviewer instructions

This is the number of contact calls that were attempted to contact the respondent. A maximum of 10 attempts should ideally be made. However, 3 or 4 calls may be more realistic in some countries. Each country will decide on the optimum number of calls and communicate this to WHO. Phone calls, which are not answered or messages left on answering machines, will not be counted as contact calls.