15-1

15-2 McGraw-Hill/Irwin © 2003 The McGraw-Hill Companies, Inc.,All Rights Reserved. Part Four ANALYSIS AND PRESENTATION OF DATA

15-3 Chapter Fifteen DATA PREPARATION AND DESCRIPTION

15-4 Editing Detects errors and omissions, Corrects them when possible, and Certifies that minimum data quality standards are achieved

15-5 Editing (cont.) Guarantees that data are –accurate –consistent with other information –uniformly entered –complete –arranged to simplify coding and tabulation

15-6 Editing Field Editing –translation of ad hoc abbreviations and symbols used during data collection –validation of the field results. Central Editing

15-7 Coding Rules that guide the establishment of category sets –Appropriate to the research problem and purpose –Exhaustive –Mutually exclusive –Derived from one classification principle

15-8 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

15-9 Data Entry Options Optical scanning Voice recognition Keyboard

15-10 Data Entry Formats Database with full screen editor Spreadsheet

15-11 Descriptive Statistics Distribution Descriptors –Location –Spread –Shape

15-12 Descriptive Statistics Distribution Descriptors –Location Central Tendency –Mean –Median –Mode

15-13 Descriptive Statistics Distribution Descriptors –Spread Variance, Standard Deviation, Range, Interquartile Range

15-14 Descriptive Statistics Distribution Descriptors –Shape Skewness Kurtosis