1. Chapter 15 Conducting & Reading Research Baumgartner et al Chapter 15 Measurement Issues in Research

2. Chapter 15 Conducting & Reading Research Baumgartner et al Essential Characteristics of Data : set of scores : data-gathering technique Good test –objective –reliable –valid

3. Chapter 15 Conducting & Reading Research Baumgartner et al More detailed look at good data characteristics : between person concordance (rater reliability) : consistency of scores : data measure what they’re supposed to measure Commonly determined by calculating correlation coefficient

4. Chapter 15 Conducting & Reading Research Baumgartner et al Objectivity Two scorers must independently score a group of people Correlation coefficient = objectivity coefficient

5. Chapter 15 Conducting & Reading Research Baumgartner et al Achieving Reliability Must get at least two repeated measure scores 1.multiple trials of physical performace test within a day 2.multiple administrations of physical performance test on different days 3.multiple items on knowledge test 4.two forms of knowledge test administered on same or different days 5.other repeated measures

6. Chapter 15 Conducting & Reading Research Baumgartner et al Types of Reliability Internal consistency reliability Stability reliability Reliability coefficient

7. Chapter 15 Conducting & Reading Research Baumgartner et al Verifying Validity Logical approach –acceptable if no other approach possible –typically used in combination with other approaches –consult “ ” Criterion approach ( ) –determine correlation between new test and some standard accepted test (“ ”) Construct approach – : something known to exist but may not be able to be precisely defined –feelings, attitudes, team work, total ability,etc. –form groups based on constructs and compare test scores (trained vs. untrained)