1. WHO The World Health Survey Data Entry
Classification, Assessment and Surveys
Classification Assessment and Surveys - GPE / EIP

2. Quality Assurance for Data
Data Retrieval
Data Entry
Checking and Feedback
Data Set Standards
Data description
Derived variables
Merging
Archiving
Classification Assessment and Surveys - GPE / EIP

3. Quality Assurance Steps for Data Retrieval
Supervisor
Supervisor’s check
- consistency, - quality, - completeness.
Data analysts’ check
- representativeness
- basic descriptive statistics
- outliers
-implausible values
Analytical checks
Data entry program check
- range
- logical consistency
data entry
Double data entry
- compare 1st and 2nd
- identifies typing errors
Program checks for: - inconsistencies, - missing values, - Identification numbers - double data entry, etc.
data checking
algorithms
2nd data entry
Overall view of the Quality Assurance for the Data Entry and Retrieval
Supervisor checks the questionnaire form before the data entry starts. (What they check have been/will be discussed in more detail by other colleagues)
WHO data entry program is use for data entry. It checks ranges and logical consistencies
2nd data entry is performed for identifying typing errors and catching accidentally skipped questions
Data is sent to WHO in batches using , CDROM, diskette.
Other programs check inconsistencies, missing values, ... and produces a report to be sent back to the sites. Also any corrections received by the sites are applied to the data.
Data analysts check for representativeness, basic descriptive statistics and outliers. (My colleagues will give more information about this step)
WHO sends feedback to the sites.
Electronic data transfer
, CD, diskette
WHO
feedback
Site
Classification Assessment and Surveys - GPE / EIP

4. Classification Assessment and Surveys - GPE / EIP
Data Entry process
WHO data entry program to be used by the sites
to avoid conversion errors
to provide range and consistency checks
Double Data Entry performed.
To avoid entry errors
Data sent to WHO in regular intervals.
To give feed-back to sites on the data quality and correct any errors while in the field
Data correction or updating in accordance with the feedback.
Classification Assessment and Surveys - GPE / EIP

5. Sample Feedback Report
COUNTRY: TURKEY
CASES SENT: male female
37 -- test -- 2 retest
PERIOD : 1 June - 11 June
Number of Interviewers : 4
Distribution:
Interviewer # Initials # of cases time(avg.)
FA (101)
CC (93)
DE (92)
TC (65)
....
CASES WITH PROBLEMS:
Age missing (IDs)
Person trained in medical field is not an adult in the HHRoster
Classification Assessment and Surveys - GPE / EIP

6. Classification Assessment and Surveys - GPE / EIP
WHO Data Entry Program
Features of the program
ID number and rotations - Kish tables
Range checking
Skips
Double data entry
Save Interviews (compressed)
Stop/Continue later.
Manage cases (remove, rename, etc.)
SPSS export
Other components of the program (used at WHO)
Automatic data extraction and merging programs.
Automatic creation of retest variables from retest cases.
Classification Assessment and Surveys - GPE / EIP

7. Why Unified Data Entry Program?
Save time by not dealing with data conversion.
Data compatibility with the WHO backend tools for:
Data merging.
Data checking.
Data processing.
Analysing the data.
Start analysis with incomplete data and use the same process when we have the full data.
Classification Assessment and Surveys - GPE / EIP

8. Other Data Entry Programs - 1
There are exceptional cases where we may accept data from other programs.
Site already has a routine set-up and trained personnel for another program
e.g. CAPI programs
WHS is part of National survey
WHO and Site works together with the data definition
Burden of conversion to SPSS or WHO data base is on the site
Classification Assessment and Surveys - GPE / EIP

9. Other Data Entry Programs - 2
In these cases we would like the data to be in the specified format:
The data should be in SPSS format. (WHO will provide a template file)
All of the variables of our survey should exist and named exactly the same way.
All of the variable types and sizes should match ours.
ID numbering is done according to our specifications
Classification Assessment and Surveys - GPE / EIP

10. Classification Assessment and Surveys - GPE / EIP
WHO Data Entry Program
A sample data entry program screen.
On the left, we have the variable names which match the question numbers in the questionnaire.
In the middle, we have places for the data to be coded in.
On the right (in blue) we have short description of the questions.
Classification Assessment and Surveys - GPE / EIP

11. Classification Assessment and Surveys - GPE / EIP
WHO Data Entry Program (range checking)
The program performs range checking. It gives an error message if there is an out of range answer
Classification Assessment and Surveys - GPE / EIP

12. Classification Assessment and Surveys - GPE / EIP
WHO Data Entry Program (double entry)
In the double data entry, the program checks whether the 1st time entry matches the 2nd time and gives an error message if there is a mismatch
Classification Assessment and Surveys - GPE / EIP

13. Data compilation possibilities
Data Collection
paper & pencil
CAPI
CATI
Data Transfer
CD, diskette
ftp or web upload
Interval
daily
weekly
fortnightly
Classification Assessment and Surveys - GPE / EIP

14. Classification Assessment and Surveys - GPE / EIP
Data Set Standards - 1
Detailed description of the data (code book) will be provided with the data.
Classification Assessment and Surveys - GPE / EIP

15. Classification Assessment and Surveys - GPE / EIP
Data Set Standards - 2
Derived variables to be documented.
For each derived variable :
Which variables of the questionnaires have been used to derive the new variable.
What was the algorithm that is used.
Classification Assessment and Surveys - GPE / EIP

16. Classification Assessment and Surveys - GPE / EIP
Data Set Standards - 3
Merging the data
If data with same ID is received, 2nd is assumed to be an updated version of the 1st.
Data Archival
Data Set will be archived using a standard tool.
VDC (Virtual Data Center) by Harvard-MIT Data Center
“an instrument to manage and share numerical social science data easily”
Classification Assessment and Surveys - GPE / EIP