Measurement and Assessment of Research Results

1 / 13

# Measurement and Assessment of Research Results - PowerPoint PPT Presentation

Measurement and Assessment of Research Results. Four Levels or Scales of Measurement. Nominal Ordinal Interval Ratio. Four Levels or Scales of Measurement. Nominal – A, B, C, or 1, 2, 3 EX: 1 = boys, 2 = girls; 1 = in sports, 2 = not in sports;

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

## PowerPoint Slideshow about 'Measurement and Assessment of Research Results' - hyacinth-rocha

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

### Measurement and Assessment of Research Results

Four Levels or Scales of Measurement
• Nominal
• Ordinal
• Interval
• Ratio
Four Levels or Scales of Measurement
• Nominal – A, B, C, or 1, 2, 3
• EX: 1 = boys, 2 = girls;
• 1 = in sports, 2 = not in sports;
• 1 = reduced lunch, 2 = not reduced lunch
• 1 = freshmen, 2 = sophomores, 3 = juniors, 4 = seniors
• 1 = American, 2 = Canadian, 3 = Mexican
• 1 = experimental group, 2 = control group
Four Levels or Scales of Measurement
• Ordinal– Rank from first to last, best to worst. Items are ranked, but the distance between them is unknown and variable.
• EX: 1st in class, 2nd in class, 3rd in class
• 1st place in race, 2nd place, 3rd place
• No. #1 song, #2 song, #3 song
• Valedictorian, Salutatorian
Four Levels or Scales of Measurement
• Interval– Rank with equal intervals or distance between numbers; lacks an absolute-zero point
• EX: A students, B students, C students, D students
• Fahrenheit, Celsius, IQ,
Four Levels or Scales of Measurement
• Ratio– Has all the properties of nominal, ordinal, interval scales plus an absolute-zero point
• EX: A test where someone could miss all answers (number of right answers could equal zero)
• Annual income, height, weight, response time
Other terms
• Testing and assessment
• Testing – measuring variables with a device
• Assessment – gathering and integrating data – tests, interviews, observations – to make an evaluation
• Traits and States
• Traits – long-term characteristics
• Free-floating anxiety
• States – short-term characteristics
• Situational anxiety
Identifying a good test or assessment procedure - Reliability and Validity
• Reliability – if the student takes the same test multiple times, does he get nearly identical scores
• Test + retest has pollutants. Familiarity with the test if the time is too short, growth of the individual if the time is too long
Identifying a good test or assessment procedure - Reliability and Validity
• Split-Half Reliability – split the test in two
• Ex: odd questions vs even questions, first 25 questions vs next 25 questions
Identifying a good test or assessment procedure - Reliability and Validity
• Validity – Does the test support the actions we take based on the scores
• Does it test for the traits we were researching?
• Gathering evidence supporting the score inference
• EX: IQ of 130 assures success in college; if many show IQ of 130, but fail college, test may lack validity
• EX: High scores on algebra aptitude test imply success in algebra class; use validity coefficient or expectancy data to determine. Kids fail algebra, problem with test
Achievement vs Aptitude tests
• Achievement tests measure degree of learning after a person has been exposed to a specific learning experience
• Aptitude tests measure broader learning based on information acquired through a lifetime of learning
Additional examples of Expectancy Data = Aptitude Tests
• SAT for college bound imply they will succeed
• CSAT for teachers imply they will succeed
• LSAT for law students imply they will succeed
• MCAT for medical students imply they wil succeed