Chapter One Data Collection

1
Chapter OneData Collection

• 1.4
• Sources of Error in Sampling

2
Non-sampling errors are errors that result from
the survey process. They are due to the
non-response of individuals selected to be in the
survey, inaccurate response, poorly worded
questions, bias in the selection of individuals
to be in the survey, etc.
3
Sampling error is the error that results in using
sampling to estimate information regarding a
population. This type of error occurs because a
sample does not give complete information about
the population.
4
Sources of Non-sampling Error
5
Sources of Non-sampling Error

• Incomplete Frame

6
Sources of Non-sampling Error

• Incomplete Frame
• Non-response

7
Sources of Non-sampling Error

• Incomplete Frame
• Non-response
• Poor Interviewer

8
Sources of Non-sampling Error

• Incomplete Frame
• Non-response
• Poor Interviewer
• Incorrect Data Entry

9
Sources of Non-sampling Error

• Incomplete Frame
• Non-response
• Poor Interviewer
• Incorrect Data Entry
• Poorly worded question
• Open versus Closed Question
• Ordering of Questions