Strand 2: Origin - Destination Flow Data

Question 1

What sort of data is Migration and Commuting classed as?

Answer 1

Flow Data/ Interaction Data/ Origin - Destination Statistics

Question 2

From the Census what sort of data is available for various migration variables?

Answer 2

1. Migrant
2. Migrant Household
3. Wholly Moving Household

Question 3

What are the 2 types of data available from the 1991 Census about Interaction Data?

Answer 3

1. Special Migration Statistics (SMS)

2. Special Workplace Statistics (SWS)

Question 4

What are the 3 types of data available from the 2001/11 Census about Interaction Data?

Answer 4

1. SMS for the UK
2. SWS for ENG, WAL, NI
3. Special Travel Statistics (STS) for SCOT, includes travel to place of study

Question 5

What online system do you use to access SWS & SMS from the UK Data Service

Answer 5

WICID - Web-based Interface to the Census Interaction Data (91/01/11) - Also provides re-esimates

Question 6

SMS is very useful but what problems does it face?

Answer 6

Preserving Confidentiality - ONS are reluctant to provide info and produce data where counts are very small

Question 7

What was the ONS’ solution to confidentiality issues in 1991?

Answer 7

Suppression

Question 8

What is Suppression?

Answer 8

The non publication of counts in certain tables

Question 9

What was wrong with Suppression (1991)?

Answer 9

1. Widespread
2. Unnecessary
3. Prevent Accurate Analysis

Question 10

Who developed a method to ‘recover’ the suppressed data and have estimated ‘complete’ SMS matrices?

Answer 10

Rees and Duke-Williams (1997)

Question 11

What is the most detailed and complete source of information on internal migration and immigration in the UK?

Answer 11

CENSUS

Question 12

What method was used to prevent risk of disclosure in 2001?

Answer 12

Small Cell Adjustment Method (SCAM)

Question 13

What is the Small Cell Adjustment Method? (SCAM)

Answer 13

• In each table flow counts of 1 and 2 at any one level were adjusted to be 0 or 3
• Meaning at any one level the flows in different tables will not be equal

Question 14

What does the government use migration data for?

Answer 14

To produce mid-year population projections and estimates

Question 15

What are other sources of Migration data?

Answer 15

1. Labour Force Survey
2. International passenger Survey
3. National Health Service Central Registers (NHSCR)

Question 16

What are other sources of commuting data?

Answer 16

1. National Travel Survey
2. Pupil Level Annual School Census
3. Hospital Episode Statistics for patient journeys to hospitals

Question 17

What does the NHSCR provide?

Answer 17

Re-registration data: Records those who transfer their registration from a doctor in one area to a doctor in another

Question 18

What 6 attributes are available from NHSCR?

Answer 18

1. Old Location
2. New Location
3. Age at migration
4. Sex
5. DoB
6. Date at Migration

Question 19

What are the key characteristics of NHSCR?

Answer 19

1. Migration measurement concept is different to the Census (Census = Transition Data, NHSCR = Movement or event data)
2. Mulitple and return moves are included
3. Different time plans are included
4. NHSCR shows us variations

Question 20

What are 8 other measures of Migration?

Answer 20

1. GROSS migration flows and intensities (rates)
2. Migration Churn
3. NET migration flow and intensities (rates)
4. Indices of migration EFFICIENCY/ EFFECTIVENESS
5. Indices of CONNECTIVITY
6. Indices of CONCENTRATION
7. Indices of INEQUALITY
8. Spatial Interaction Modelling

Question 21

What is the International Passenger Survey (IPS)?

Answer 21

Thorough survey asked at all major airports, ferry ports and EuroStar locations to passengers travelling from abroad.
Asks about their length of stay, purpose etc.

Question 22

What did The Guardian (2014) report about the new e-Borders Immigration Programme?

Answer 22

1. Inadequate as doesn’t say whether passengers are long-term migrants, visitors or just tourists
2. Claim it doesn’t substitute the IPS even though the IPS is said to have some failings
3. Should be used in conjunction with the IPS to estimate net-migration

Question 23

What are Flag 4 Records?

Answer 23

Reflects the number of people registering with a GP whose previous address was outside the UK and who have spent longer than 3 months living in the UK

Question 24

What are the limitations with Flag 4 Records?

Answer 24

1. No indication of the delay between arrival and registration i.e. when they entered the UK
2. No info. on patients who have left the UK
3. Some don’t register with a GP at all, especially younger male economic migrants
4. Flag 4 code not retained once a patient moves within the UK and registers with a new GP
5. Age and gender recorded, but not nationality or place of birth

Question 25

What was the Worker Registration Scheme (WRS)?

Answer 25

All A8 migrants (migrants from the 8 countries that joined the EU in 2004) were required to register to the scheme in order to work in the UK. However, no longer operates