![]() In the example above, you might know the answer but you might mis-read the question and get it wrong. It is usually impossible to measure a construct without some amount of error. ![]() On the other hand, if I give a multiple choice test with very obvious wrong answers, then you might be able to perform well on the test even if you don’t actually understand the material. This test might or might not be a good measurement of the construct of your actual knowledge - for example, if I were to write the test in a confusing way or use language that you don’t understand, then the test might suggest you don’t understand the concepts when really you do. I could give you a pop quiz that would ask you several questions about these concepts and count how many you got right. ![]() For example, let’s say that I want to test how well you understand the distinction between the four different scales of measurement described above. In many fields such as psychology, the thing that we are measuring is not a physical feature, but instead is an unobservable theoretical concept, which we usually refer to as a construct.
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