week 3 PTTR (validity and reliability)

Question 1

what is one way to evaluate if a new measure is good?

Answer 1

test the consistency of the relationship between the new measure and previous measures
you can do this by computing a correlation or scatter graphs

Question 2

what is concurrent validity?

Answer 2

demonstrating that the scores
obtained from the new measurement technique are directly related to the scores obtained
from another, better-established procedure for measuring the same variable

Question 3

what is construct validity?

Answer 3

demonstrating that the measurement of the variable behaves in the same way as the variable itself

Question 4

what is convergent and divergent validity?

Answer 4

convergent: two different measures for the same costruct produce the same scores
divergent: measurements of two distinct constructs produce different scores

Question 5

what is it called when different versions of the intstrument to test and rest to demonstrate reliability?

Answer 5

parralel forms reliability

Question 6

how may you test for internal consistency?

Answer 6

by using split half reliability

Question 7

what are ceiling and floor effects?

Answer 7

A ceiling effect is the clustering of scores at the high end of a measurement scale,
allowing little or no possibility of increases in value.
A floor effect is the clustering of scores at the low end of a measurement scale,
allowing little or no possibility of decreases in value

Question 8

what is an artefact in experiments?

Answer 8

an external feature that may influence or distort the measurements