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

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

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 email, 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 e-mail, CD, diskette WHO feedback Site Classification Assessment and Surveys - GPE / EIP

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

Sample Feedback Report COUNTRY: TURKEY CASES SENT: 39 -- 18 male -- 21 female 37 -- test -- 2 retest PERIOD : 1 June - 11 June Number of Interviewers : 4 Distribution: Interviewer # Initials # of cases time(avg.) 0002 FA 6 90-120 (101) 0011 CC 13 81-130 (93) 0021 DE 12 75-121 (92) 0032 TC 8 60-70 (65) .... CASES WITH PROBLEMS: Age missing (IDs) 158000021 Person trained in medical field is not an adult in the HHRoster 158000521 Classification Assessment and Surveys - GPE / EIP

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

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

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

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

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

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

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

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

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

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

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