Measuring my intelligence by means of “asking my mum” is very unreliable: some days she tells me I’m a bit thick, and other days she tells me I’m a complete moron. The measurement of my weight by means of a “bathroom scale” is very reliable: if I step on and off the scales over and over again, it’ll keep giving me the same answer. Reliability is actually a very simple concept: it refers to the repeatability or consistency of your measurement. In this section I’ll talk about reliability we’ll talk about validity in the next chapter. Put simply, the reliability of a measure tells you how precisely you are measuring something, whereas the validity of a measure tells you how accurate the measure is. At this point, we should start discussing the obvious question: is the measurement any good? We’ll do this in terms of two related ideas: reliability and validity. \)Īt this point we’ve thought a little bit about how to operationalise a theoretical construct and thereby create a psychological measure and we’ve seen that by applying psychological measures we end up with variables, which can come in many different types.
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