ECON 1 Lecture Notes - Lecture 31: Concurrent Validity, Time Point, Face Validity
Document Summary
What a measurement instrument does: tries to isolate 1 characteristic and tries to quantify to what extent someone has that gives an incomplete description of reality on purpose. What is a measurement error?any difference between the observed value and the real or true value which leads to the skewing of results if not solved. Can happen across al psychological experiments from recording instrument failure to human error. Example: if you drive 103 km/hr where the max speed is 10 km/hr, you will not get a ticket. Because it is within the margin of ---. Error: can be divided into random and systematic. Random measurement error: measurement error caused by chance ( random factors). Systematic: the measurement instrument shows a score that is consistently too high or too low. Observed score is equal to true score + random measurement error. Uncovering measurement errors: the amount of variance of the repeated measure is a way to determine the amount of .
