2. Chapter. Data Collection. Data Vocabulary Level of Measurement Time Series and Cross-sectional Data Sampling Concepts Sampling Methods Data Sources Survey Research. McGraw-Hill/Irwin. © 2008 The McGraw-Hill Companies, Inc. All rights reserved.
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Level of Measurement
Time Series and Cross-sectional Data
© 2008 The McGraw-Hill Companies, Inc. All rights reserved.
Consider the multivariate data set with
5 x 8 = 40 observations
Verbal LabelX = economics(your major)
CodedX = 3(i.e., economics)
DiscreteX = 2(your siblings)
ContinuousX = 3.15(your GPA)Data Vocabulary
N the population?
Here,N/n > 20
=RANDBETWEEN(1,48) the population?Sampling Methods
Start Here the population?
Table of 1,000 Random Digits
These are pseudo-random generators because even the best algorithms eventually repeat themselves.
k = N/n
= 501/25 20.
Sampling Methods the population?
Survey Research the population?
Plan What is the purpose of the survey? Consider staff expertise, needed skills, degree of precision, budget.
Design Invest time and money in designing the survey. Use books and references to avoid unnecessary errors.
Quality Take care in preparing a quality survey so that people will take you seriously.
Pilot Test Pretest on friends or co-workers to make sure the survey is clear.
Buy-in Improve response rates by stating the purpose of the survey, offering a token of appreciation or paving the way with endorsements.
Expertise Work with a consultant early on.
Are you married? Yes No
How old is your father? 35 – 45 45 – 55 55 – 65 65 or older