Senegal

Title: Enquête Sénégalaise auprés des ménages

GENERAL INFORMATION AND BASIC DEFINITIONS

1. Background

Further information is available from Direction Prévision Statistique of Bp 116 Dakar Senegal, phone: 824 0301 6349632 6300759, fax: 824 9001 8249004, e-mail: matargueye@hotmail.com bmsylla@hotmail.com.
Data have been collected by household survey since 1995.

2. Purpose and coverage

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

• to obtain weights for consumer price index
• to estimate household expenditure for national accounts
• to study the general structure of household incomes/expenditures
• to study income/expenditure patterns of disadvantaged groups, including pensioner households, single parent households, etc
• to study income/expenditure disparities among socio-economic groups
• to study consumer behaviour among socio-economic groups
• for general poverty and/or income distribution studies
• to study effects on income and expenditure of policy changes, especially tax changes

Lesser importance is attached to:

• for market research purposes

Geographic coverage: National without any specific geographic areas excluded.

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

• one person private households
• private households with more than one person
• households of other foreigners in the country
• armed forces residing in private housing outside military base

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

• those in collective housing (such as long term hospitals, prisons, monasteries, military quarters)
• non-resident households of nationals (households of nationals located abroad)
• armed forces residing in private housing within military base

Units: Dwelling units are not used in the sample selection.

Data are recorded for the household unit which is characterised by:

• one person units
• two or more people living together:
  • sharing a single dwelling or compound
  • sharing meals
  • sharing a common budget for (at least) food and housing expenditures
  • pooling their income to some extent

Data are recorded for the income unit which is characterised by:

• two or more people:
  • living in the same household
  • sharing a single dwelling or compound
  • pooling their income to some extent

Data are recorded for the consumer unit, expenditure unit or spending unit which is characterised by:

• two or more people:
  • living in the same household
  • sharing a single dwelling or compound
  • sharing meals
  • sharing a common budget for (at least) food and housing expenditures

Unit members: ¹ Usual residents temporarily living away from the dwelling are included, if away continuously for less than 6 months. Visitors (not usual residents) temporarily living in the dwelling are included, if staying continuously for more than 6 months. a visitor who intends to stay is included.. Domestic staff living in same dwelling/compound are included in the unit. Renters living in same dwelling/compound are not included in the unit. Boarders living in same dwelling/compound are not included in the unit.

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

• acknowledged as such by other household/unit members
• responsible for financial maintenance of household/unit

3. Reference periods

The time period to which income and/or expenditure statistics refer when released/published is from 04/94 to 04/95. These data are collected in the period from 03/94 to 04/95. This survey is conducted 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:

• geographical regions
• rural/urban

The sampling frames for the Primary Sampling Unit (PSU) and Ultimate Sampling Unit (USU) were the list of Census enumeration areas and list of households PSU respectively. The sample size was 3300 households or other units and 3287 interviews. The overall response rate for the survey was 99 percent. Errors/biases were minimized by using an updated sampling frame, an increased sample size, stratification.

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.

DATA COLLECTION, CONCEPTS, DEFINITIONS AND CLASSIFICATIONS

5. Income data

Income data are collected. Receipts do not 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. Income excludes receipts that are not currently available to the unit.

The following receipts are collected separately:

• wages and salaries
• cash bonuses and gratuities
• commissions and tips
• remuneration for time not worked, e.g. leave pay
• termination and redundancy payments
• employer social security contributions
• employee social security contributions
• employee income in-kind provided free or subsidized: housing
• employee income in-kind provided free or subsidized: meals
• employee income in-kind provided free or subsidized: car/transportation
• employee income in-kind provided free or subsidized: goods or services produced by employer
• employee income in-kind provided free or subsidized: other goods or services
• profit/loss from unincorporated enterprises (mixed income)
• drawing for own use from unincorporated enterprises
• goods produced for own consumption
• services produced for own consumption
• goods produced for barter
• services produced for barter
• stock consumed from unincorporated enterprise
• services from owner-occupied dwellings
• services from other consumer durables (net)
• interest received
• dividends
• rentals (payment received for produced assets e.g. house)
• rents (payment received for un-produced assets e.g. land)
• royalties
• regular pensions/annuities from schemes to which employee does not contribute
• retirement pensions from compulsory social security schemes
• other pensions

The following receipts are collected but not separately:

• family-related allowances
• sickness benefits
• invalidity benefits
• education-related allowances
• housing allowances
• free government dwelling
• subsidized government dwelling
• food subsidies
• medical reimbursements
• other social insurance benefits
• other social assistance benefits
• regular support received from non-profit institutions serving households: cash, e.g. scholarships
• regular support received from non-profit institutions serving households: goods and services
• regular support received from non-profit institutions serving households: free dwelling
• regular support received from non-profit institutions serving households: subsidized dwelling
• regular inter-household transfers received from: family, e.g. alimony, child/parental support
• regular inter-household transfers received from: regular inheritances or trusts
• regular inter-household transfers received from: regular cash gifts
• regular inter-household transfers received from: regular in-kind gifts
• regular inter-household transfers received from: free dwelling
• regular inter-household transfers received from: subsidized dwelling
• regular inter-household transfers received from: regular free services

The following receipts are not collected:

• old age benefits
• unemployment benefits
• survivors benefits
• social transfers in kind: medical services
• social transfers in kind: public education
• social transfers in kind: transport subsidies
• social transfers in kind: cultural and recreational services
• social transfers in kind: others

The following receipts are classified as income from paid employment:

• wages and salaries
• cash bonuses and gratuities
• commissions and tips
• remuneration for time not worked, e.g. leave pay
• termination and redundancy payments
• employer social security contributions
• employee social security contributions
• employee income in-kind provided free or subsidized: housing
• employee income in-kind provided free or subsidized: meals
• employee income in-kind provided free or subsidized: car/transportation
• employee income in-kind provided free or subsidized: goods or services produced by employer
• employee income in-kind provided free or subsidized: other goods or services

The following receipts are classified as income from self-employment:

• profit/loss from unincorporated enterprises (mixed income)
• drawing for own use from unincorporated enterprises
• goods produced for own consumption
• services produced for own consumption
• stock consumed from unincorporated enterprise

The following receipts are classified as property income:

• services from owner-occupied dwellings
• services from other consumer durables (net)
• rentals (payment received for produced assets e.g. house)
• rents (payment received for un-produced assets e.g. land)

The following receipts are classified as transfer income but not employment-related:

• regular pensions/annuities from schemes to which employee does not contribute
• retirement pensions from compulsory social security schemes
• old age benefits
• other pensions
• family-related allowances
• sickness benefits
• invalidity benefits
• education-related allowances
• housing allowances
• free government dwelling
• subsidized government dwelling
• food subsidies
• medical reimbursements
• other social insurance benefits
• other social assistance benefits
• regular support received from non-profit institutions serving households: cash, e.g. scholarships
• regular support received from non-profit institutions serving households: goods and services
• regular support received from non-profit institutions serving households: free dwelling
• regular support received from non-profit institutions serving households: subsidized dwelling
• regular inter-household transfers received from: family, e.g. alimony, child/parental support
• regular inter-household transfers received from: regular inheritances or trusts
• regular inter-household transfers received from: regular cash gifts
• regular inter-household transfers received from: regular in-kind gifts
• regular inter-household transfers received from: free dwelling
• regular inter-household transfers received from: subsidized dwelling
• regular inter-household transfers received from: regular free services

The following receipts are classified as other income but not employment-related:

• goods produced for barter
• services produced for barter
• royalties

The following receipts are collected using the last month as the reference period:

• goods produced for own consumption
• services produced for own consumption
• goods produced for barter
• services produced for barter
• services from owner-occupied dwellings
• services from other consumer durables (net)

The following receipts are collected using the last 12 months as the reference period:

• termination and redundancy payments
• employer social security contributions
• employee social security contributions
• employee income in-kind provided free or subsidized: housing
• employee income in-kind provided free or subsidized: meals
• employee income in-kind provided free or subsidized: car/transportation
• employee income in-kind provided free or subsidized: goods or services produced by employer
• employee income in-kind provided free or subsidized: other goods or services
• profit/loss from unincorporated enterprises (mixed income)
• drawing for own use from unincorporated enterprises
• stock consumed from unincorporated enterprise
• interest received
• dividends
• rentals (payment received for produced assets e.g. house)
• rents (payment received for un-produced assets e.g. land)
• royalties
• regular pensions/annuities from schemes to which employee does not contribute
• retirement pensions from compulsory social security schemes
• old age benefits
• other pensions
• family-related allowances
• sickness benefits
• invalidity benefits
• education-related allowances
• housing allowances
• free government dwelling
• subsidized government dwelling
• food subsidies
• medical reimbursements
• other social insurance benefits
• other social assistance benefits
• regular support received from non-profit institutions serving households: cash, e.g. scholarships
• regular support received from non-profit institutions serving households: goods and services
• regular support received from non-profit institutions serving households: free dwelling
• regular support received from non-profit institutions serving households: subsidized dwelling
• regular inter-household transfers received from: family, e.g. alimony, child/parental support
• regular inter-household transfers received from: regular inheritances or trusts
• regular inter-household transfers received from: regular cash gifts
• regular inter-household transfers received from: regular in-kind gifts
• regular inter-household transfers received from: free dwelling
• regular inter-household transfers received from: subsidized dwelling
• regular inter-household transfers received from: regular free services

The following receipts are collected using the 'last payment' and 'period covered':

• wages and salaries
• cash bonuses and gratuities
• commissions and tips
• remuneration for time not worked, e.g. leave pay

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 month.

Diaries are used to collect expenditure on the following items:

• food
• alcohol, tobacco
• other household non-durables (such as newspapers, batteries)
• clothing, footwear
• other personal non-durables (such as perfumes)
• household services (such as plumber)
• personal services (such as driving lessons, haircuts)

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:

• to expenditures in last 12 months:
  • other household non-durable goods
  • clothing, footwear
  • other personal non-durable goods
  • housing
  • other durable goods
  • households services
  • personal services
  • other items

Data for the following expenditure items are not collected by interview because they are collected by diary:

• food

The following types of expenditure items are classified as 'Household consumption expenditure':

• non-durable goods purchased
• durable goods purchased (except housing)
• purchase price of owner-occupied housing
• services of owner-occupied housing
• major repairs, conversions and extensions to owner-occupied housing
• income in-kind receipts of goods
• income in-kind receipts of services
• own produced non-durable goods
• own-produced durable goods
• own-produced services
• services from durables owned (except housing)
• licences and fees (e.g. driver's licence, hunting licence, vehicle registration)
• gambling expenditure
• out of pocket health expenditure
• out of pocket education expenditures
• out of pocket transport expenditures
• housing maintenance, minor repairs
• regular cash payments to others outside the household
• non-regular cash payments to others outside the household
• purchase of gifts of goods and services given to others outside the household
• second hand goods purchased
• expenditure abroad
• valuables

The following types of expenditure items are classified as 'Actual Household consumption':

• in-kind goods received from other households
• in-kind services received from other households
• social transfers in-kind of goods and services from government and non-profit institutions serving households

The following types of expenditure items are classified as 'Non-household expenditure':

• interest payments (excluding mortgage interest payments)
• financial services (including fees for financial advice, brokerage fees)
• non-life insurance premiums (e.g. vehicle, housing, other property, medical)
• life insurance premiums
• occupational expenditures
• other business-related expenditures

The following types of expenditure items are classified as 'Investment/liability expenditure':

• compulsory transfers to governments (e.g. contributions to government old age and disability insurance program, taxes)
• investment-related expenditures (e.g. purchase of shares/stocks)

The following types of expenditure items are collected on an 'acquisitions' basis:

• non-durable goods purchased
• durable goods purchased (except housing)
• major repairs, conversions and extensions to owner-occupied housing
• income in-kind receipts of goods
• income in-kind receipts of services
• own produced non-durable goods
• own-produced durable goods
• own-produced services
• services from durables owned (except housing)
• out of pocket health expenditure
• out of pocket education expenditures
• out of pocket transport expenditures
• second hand goods purchased
• expenditure abroad
• valuables

The following types of expenditure items are collected on a 'use' basis:

• services of owner-occupied housing
• housing maintenance, minor repairs
• regular cash payments to others outside the household
• non-regular cash payments to others outside the household
• purchase of gifts of goods and services given to others outside the household

The following types of expenditure items are collected on a 'payments' basis:

• compulsory transfers to governments (e.g. contributions to government old age and disability insurance program, taxes)
• investment-related expenditures (e.g. purchase of shares/stocks)
• occupational expenditures
• other business-related expenditures

The following types of expenditure items are collected on some other basis:

• in-kind goods received from other households
• in-kind services received from other households
• social transfers in-kind of goods and services from government and non-profit institutions serving households
• interest payments (excluding mortgage interest payments)
• financial services (including fees for financial advice, brokerage fees)
• non-life insurance premiums (e.g. vehicle, housing, other property, medical)
• life insurance premiums
• licences and fees (e.g. driver's licence, hunting licence, vehicle registration)
• gambling expenditure

Classification: COICOP is used for classifying expenditure and has an unspecified number of separate categories at the finest level.

7. Other Data Collection Issues

The following other topics are covered:

• demographic characteristics
• education attainment of members
• employment status of members
• occupation of members
• ownership of selected durable goods
• housing characteristics
• savings
• indebtedness

Households are 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 the following measures:

• more than one repeat visits
• other measures : awareness raising

Reporting errors are reduced using the following measures:

• careful instrument design
• bounding interview
• adequate cues or props for prompting
• quality control

DATA PROCESSING, ANALYSIS AND DISSEMINATION

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

The responses are edited by the following:

• field supervisors
• office staff

Extreme values are amended. In-kind receipts and consumption of own production are included in the estimates. In-kind receipts are valued using: the respondent's estimate. Consumption of own production is valued using: the imputed in office processing using market prices.

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.

The following information is used in this valuation:

• imputed based on housing and rent data

Treatment of selected groups/values in analysis: No 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

Sampling errors: Sampling errors are not computed.

Tabulation and Analysis: Statistics are presented showing averages per year and statistics are analysed and tabulated for households and for individuals separately.

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

• age of reference person or head of household
• sex of reference person or head of household
• occupation of reference person or head of household
• absolute income groups
• principal source of household income
• household size
• other characteristic of household
• other classification, district of residence

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

• age of reference person or head of household
• sex of reference person or head of household
• occupation of reference person or head of household
• expenditure percentiles
• expenditure classes in monetary terms
• household size
• structure of household
• other characteristic of household
• other classification, district of residence

Documentation and Dissemination:
Published survey reports: rapport de Synthèse, 10/97

Additional statistics (or special tables on request) are available for public use, free of charge. Separate tables are not published for any special population groups. Files of unidentifiable unit data are available (or available on request) for public use, free of charge.