15-1
Part Four
ANALYSIS AND
PRESENTATION OF DATA
15-2
McGraw-Hill/Irwin
© 2003 The McGraw-Hill Companies, Inc.,All Rights Reserved.
Chapter Fifteen
DATA PREPARATION AND
DESCRIPTION
15-3
Editing
• Detects errors and omissions,
• Corrects them when possible, and
• Certifies that minimum data quality
standards are achieved
15-4
Editing (cont.)
• Guarantees that data are
– accurate
– consistent with other information
– uniformly entered
– complete
– arranged to simplify coding and
tabulation
15-5
Editing
• Field Editing
– translation of ad hoc abbreviations
and symbols used during data
collection
– validation of the field results.
• Central Editing
15-6
Coding
• Rules that guide the establishment of
category sets
– Appropriate to the research problem
and purpose
– Exhaustive
– Mutually exclusive
– Derived from one classification
principle
15-7
Content Analysis for Coding
• Measures the semantic content of a
message
• Researches the objective, systematic,
and quantitative description of the
content of a communication
– Syntactical unit
– Referential unit
– Propositional unit
– Thematic unit
15-8
Data Entry Options
• Optical scanning
• Voice recognition
• Keyboard
15-9
Data Entry Formats
• Database with full screen editor
• Spreadsheet
15-10
Descriptive Statistics
• Distribution Descriptors
– Location
– Spread
– Shape
15-11
Descriptive Statistics
• Distribution Descriptors
– Location
• Central Tendency
– Mean
– Median
– Mode
15-12
Descriptive Statistics
• Distribution Descriptors
– Spread
• Variance,
• Standard Deviation,
• Range,
• Interquartile Range
15-13
Descriptive Statistics
• Distribution Descriptors
– Shape
• Skewness
• Kurtosis
15-14