ROM Validity & Reliability

Question 1

Define validity

Answer 1

• refers to how well it represents the true value of the variable of interest & how well it can be used for a specific purpose

Question 2

Define face validity

Answer 2

• indicates that the instrument generally appears to measure what it is intended to measure

Question 3

Define content validity

Answer 3

• determined by judging whether an instrument adequately measures & represents the domain of content-the substance- of the variable if interest

Question 4

Define criterion related validity

Answer 4

• justifies validity of the measuring instrument by comparing measurements made with the instrument to a well established gold standard of measurement

Question 5

Define construct validity

Answer 5

• ability of an instrument to measure an abstract concept or to be used to make an inferred interpretation

Question 6

Define reliability

Answer 6

• amount of consistency between successive measurements of the same variable on the same individual under the same conditions

Question 7

What are the 3 main sources of variation in clinical measurements

Answer 7

• true biological variation
• temporal variation
• measurement error

Question 8

Define true biological variation

Answer 8

• refers to variation in measurements from one individual to another caused by age, sex, race, genetics, medical history, & condition

Question 9

Define temporal variation

Answer 9

• refers to variation in measurements made on the same individual at different times caused by a change in a person’s health status, activity level, emotional state, & circadian rhythms

Question 10

Define measurement error

Answer 10

• refers to variation in measurements made on the same individual under the same conditions at different times caused by the examiners, measuring instruments, & procedural methods

Question 11

Define standard error of measurement (SEM)

Answer 11

• likely standard deviation of the error made in predicting true scores when we have knowledge only of the obtained scores

Question 12

Define minimal detectable change (MDC)

Answer 12

• smallest amount of change in a measurement in excess of the measurement error