Colombia

Title: Encuesta national de ingresos y gastos 1994/1995

GENERAL INFORMATION AND BASIC DEFINITIONS

1. Background

Further information is available from Departamento Administrativo Nacional de Estadistica DANE of Transversal 45 n°26-70.Interior 1.CAN. Edificio DANE, phone: 5 97 83 00 5 97 83 80, fax: 5 97 83 19, e-mail: direction@dane.gov.co.
Data have been collected by household survey since 1953.

2. Purpose and coverage

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

Geographic coverage: 1 Main cities only with the following geographic areas excluded: remote or inaccessible areas, areas in conflict, rural sector .

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 used in the sample selection and are characterised by:
Data are recorded for the household unit which is characterised by:
Data are recorded for the consumer unit, expenditure unit or spending unit which is characterised by:

Unit members: Usual residents temporarily living away from the dwelling are included, if away continuously for less than 3 months. Visitors (not usual residents) temporarily living in the dwelling are included, if staying continuously for more than 3 months. Domestic staff living in same dwelling/compound are not included in the unit. Renters living in same dwelling/compound are not 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 03/94 to 02/95. These data are collected in the period from 03/94 to 02/95. This survey is conducted 10-yearly. The statistics are published 10-yearly.

SURVEY METHODOLOGY

4. Sample design

The Primary, Secondary and Ultimate Sampling Units are enumeration area/district, block and dwelling 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 and none respectively. Primary Sampling Units (PSU) were selected using probability proportional to size and Ultimate Sampling Units (USU) were selected using probability proportional to size. The sample size was 36816 households or other units. The overall response rate for the survey was 80 percent. Errors/biases were minimized by using an updated sampling frame, an increased sample size.

Enumeration procedure: Enumeration uses a single round survey design in which each reporting unit is enumerated only once. No action is taken to select a smaller set of reporting units for more detailed questioning.

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. Income excludes receipts resulting from the sale or reduction of assets and/or from incurring liabilities. Exceptions are percentage available for consumption in the reference period. Income excludes receipts that are not currently available to the unit.

The following receipts are collected separately:
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 property income:
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 excluded for other reasons:
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 directly from the individual. Negative values (business losses) were excluded when computing self-employment income.

6. Expenditure data

Data collection method:
Diaries are used to collect expenditure data and are maintained for one week.

Diaries are used to collect expenditure on the following items:
Diaries are not used to collect expenditure on the following items:
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':
The following types of expenditure items are classified as 'Non-consumption household expenditure':
The following types of expenditure items are classified as 'Non-household expenditure':
The following types of expenditure items are excluded for other reasons:
The following types of expenditure items are collected on an 'acquisitions' basis:

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: There is no substitution for non-response, whether by non-contact or by refusal.

Non-response is reduced using more than one repeat visits.

DATA PROCESSING, ANALYSIS AND DISSEMINATION

Answers are pre-coded on data collection forms to the extent possible.

The responses are edited office staff.

Extreme values are deleted. In-kind receipts are included in the estimates, but consumption of own production is not. In-kind receipts are 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 the rental equivalent net of housing costs usually paid by owners. (respondent provides an estimate )

Treatment of selected groups/values in analysis: Some households/units are excluded from analysis because of incomplete response. Missing values are imputed only on some occasions . Supplementary sources are not used to adjust estimates for under- or over-reporting. No groups are excluded from data analysis.

Weighting:
Weighting factors are used to adjust for:

Sampling errors: No information was provided on samplimg errors.

Tabulation and Analysis: Statistics are presented showing averages per month 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:

Additional statistics (or special tables on request) are available for public use, with charges. Separate tables are published for households with wages/salaries as main source of income. Files of unidentifiable unit data are available (or available on request) for public use, with charges.


(1) Bogotá, Riohacha, Santa Martha, Sincelejo, Medellín, Barranquilla, Villavicencio, Tunja, Florencia, Popayán, Armenia, Neiva, Cali, Bucaramanga,Quibdo, Ibagué, Cúcuta, Valledupar, Manizales, Pereira, Montería, Cartagena, and Pasto.