Gibraltar

Title: Family Expenditure Survey 95/96

GENERAL INFORMATION AND BASIC DEFINITIONS

1. Background

Further information is available from Statistics Office of 99 Harbours Walk, New Harbour, Gibraltar, phone: 00 350 75 515, fax: 00 350 51 160, e-mail: gibstats@gibnynex.gi.
Data have been collected by household survey since 1973.

2. Purpose and coverage

The following purposes are considered to be very important or of some importance:
Lesser importance is attached to:

Geographic coverage: National without any specific geographic areas excluded.

Population coverage:
The following types of household are included in the data collection:
The following types of household are excluded in the data collection:

Units: Dwelling units are not used in the sample selection.
Data are recorded for the household unit which is characterised by:

Unit members: Usual residents are always included as unit members. Visitors (not usual residents) temporarily living in the dwelling are not included as unit members. Domestic staff living in same dwelling/compound are included in the unit. Renters living in same dwelling/compound are included in the unit. Boarders living in same dwelling/compound are included in the unit.

Head of unit:
The concept of head of household/other unit is used in this survey and is characterised by:

3. Reference periods

The time period to which income and/or expenditure statistics refer when released/published is from 07/95 to 06/96. These data are collected in the period from 07/95 to 06/96. This survey is conducted continuously. The statistics are published irregularly/occasionally.

SURVEY METHODOLOGY

4. Sample design

The Primary, Secondary and Ultimate Sampling Units are enumeration area/district, none and household respectively.

Stratification:
Areas/districts were stratified using the following criteria:
Households/Consumption Unit, Income Unit, Family Unit were stratified using the following criteria:

The sampling frames for the Primary Sampling Unit (PSU) and Ultimate Sampling Unit (USU) were the list of Census enumeration areas as well as a register of addresses and the master sample of households respectively. The sample size was 240 households or other units. Errors/biases were minimized by using standard error.

Enumeration procedure: Enumeration uses a single round survey design in which each reporting unit is enumerated only once. The sample is not divided into representative sub-samples. No action is taken to select a smaller set of reporting units for more detailed questioning.

Due to Gibraltar being very small there were no sub-samples needed to be selected. The number of households selected at random was 240 from a total number of households of around 9700.This represents around 2.5% of the total number of households samp le.

DATA COLLECTION, CONCEPTS, DEFINITIONS AND CLASSIFICATIONS

5. Income data

Income data are collected. Receipts have to be regular and recurring to be considered as income. Exceptions are self employed. Income includes receipts resulting from the sale or reduction of assets and/or from incurring liabilities are included in income. Income excludes receipts that are not currently available to the unit.

The following receipts are collected but not separately:
The following receipts are not collected:
The following receipts are classified as income from paid employment:
The following receipts are classified as income from self-employment:
The following receipts are classified as employment-related transfer income:
The following receipts are classified as transfer income but not employment-related:
The following receipts are classified as other employment-related income:
The following receipts are classified as other income but not employment-related:
The following receipts are collected using the last week as the reference period:
The following receipts are collected using the last month as the reference period:
The following receipts are collected using the last 3 months as the reference period:
The following receipts are collected using the last 12 months as the reference period:

Income data were collected separately for each person receiving income. Components of income for an individual were collected from one person who reported for all individuals. Negative values (business losses) were excluded when computing self-employment income, only taxable income over the previous 12 months have to be declared.

6. Expenditure data

Data collection method:
Diaries are used to collect expenditure data and are maintained for two weeks.

Diaries are used to collect expenditure on the following items:

Interviews are used to collect expenditure data with the respondent completing the interview by a mix of recall and using documentation.

Data for the following expenditure items are collected by referring:
Data for the following expenditure items are not collected by interview because they are collected by diary:
The following types of expenditure items are classified as 'Household consumption expenditure':1
The following types of expenditure items are classified as 'Investment/liability expenditure':1
The following types of expenditure items are excluded due to measurement problems:1
The following types of expenditure items are collected on an 'acquisitions' basis:
The following types of expenditure items are collected on a 'payments' basis:

Classification: A national classification that is not consistent with COICOP is used for classifying expenditure and has 250 separate categories at the finest level.

7. Other Data Collection Issues

The following other topics are covered:

Households are not requested to indicate whether durable goods are new or second-hand when their acquisition is recorded.

Non-response: Non-response households (refusals and non-contacts) are substituted.

Non-response is reduced using monetary rewards.
Reporting errors are reduced using the following measures:

DATA PROCESSING, ANALYSIS AND DISSEMINATION

Answers are not pre-coded on data collection forms, but are coded by office staff.

The responses are edited office staff.

Extreme values are amended. Consumption of own production is included in the estimates, but in-kind receipts are not. Consumption of own production is valued using: the respondent's estimate.

Treatment of owner-occupied housing: Values of owner-occupied housing are included in the total income/expenditure estimates and are valued using

Treatment of selected groups/values in analysis: Some households/units are excluded from analysis because of incomplete response. Supplementary sources are not used to adjust estimates for under- or over-reporting. people in institutions are excluded from data analysis.

Weighting:
Weighting factors are used to adjust for:

Sampling errors: Sampling errors are computed for all aggregates and these sampling errors are published.

Tabulation and Analysis: Statistics are presented showing averages per week and statistics are analysed and tabulated for households only.

The following classifications are used for tabulation and analysis of income statistics:
The following classifications are used for tabulation and analysis of expenditure statistics:

Documentation and Dissemination:
Published survey reports: government of Gibraltar Family Expenditure Survey 95/96

Additional statistics (or special tables on request) are not available for public use. Separate tables are published for households with wages/salaries as main source of income. Files of unidentifiable unit data are not available (or available on request) for public use.


(1) Document: Family Expenditure Survey 1995/96. (2) Mortage interest payment both repayment and endowment methods over 1 year.