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In speaking to constructs vs. measures, I believe that the difference is clear and implied in your background: constructs are that which cannot be directly measured (but we assume exists), where measures are directly measurable attributes that we assume relate to the construct. The process you seem to be questioning is that of the operational definition, or ...

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A few thoughts: MBTI has four dimensions, whereas the Big Five has five dimensions. Thus, when you set a high-low split on MBTI you get $2^4=16$ types. If you were to apply the same idea to the Big 5, you could get $2^5=32$. However, the Big 5 framework tends to take the underlying continuum of personality traits more seriously. At the very least this ...

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Short answer: The data is likely to be noisier, the absolute reaction time can't be trusted, but given enough power (which is easy to obtain on the Internet) relative reaction time differences should be similar to those in the lab. However, web-based reaction time studies might pose other problems, because you have less control over stimulus presentation and ...

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There are a few factors that could contribute to differences between online versus in-lab reaction time measurement. Hardware variation Participants in an online experiment will use their own computers to complete the task, which will result in lots of variation in hardware. Many studies have looked at how hardware variations affect response time ...

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Depending on how you collect the data, reaction times collected "online" will likely be different from those collected "on-site". When considering reaction times, it is important to decide if the reaction time is being used as a trigger, as the time to a response, or the difference in the time to response. Consider an experiment which displays a random ...

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The main threat to a design's validity from increasing the amount of trials in any experiment comes from participant motivation and attention. After sitting in front of a monitor for a while, participants get tired, as anyone would. As a personal rule of thumb, a session should therefore not go beyond 40 minutes without breaks if possible. Rather than going ...

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