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Article Myers-Briggs Type Indicator Score Reliability Across Studies...

Dom Joy, Thank you for sharing; I couldn't find my answer in the article; anyway, thank you for your time.

If you want to calculate internal consistency reliability (using Cronbach's alpha) for the four MBTI scales, simply enter the item scores into a data set. You'll need to decide which way to score each one - for example, you might decide to have responses in the extraverted direction count as '1' and those in the introverted direction as '0' (or the other way around), because the MBTI as I recall uses a forced-choice format. (You also could use Kuder-Richardson's Formula #20 for the same purpose, since they are dichotomously scored.) Most statistics programs, such as SPSS, will compute alpha for you, but if you need to do it by hand it isn't too awful - and a spreadsheet can easily be set up to do it for you by entering the steps for the equation into empty cells. Note that because the traditional way the MBTI reports results is by placing people into types, the result will not fully assess the reliability of the typing. Instead, you'll be looking at the reliability of the scores that are used to derive the types. Reliability of types might better be evaluated using a test-retest format.

Just for interest's sake. Why would you like to do it? What is the truth you are exploring?

The MBTI is nothing more than reading tea leaves. Because it sounds instinctively true when interpreted by your system, one thinking .....does not make it accurate. The MBTI is a confluence of thinking biases, which needs to stand up to rigorous thinking two evaluation.

Stephen Joy, Thank you for taking the time to answer my question. I already calculated scores for each 4 MBTI scales, but I don't know how can I calculate the Cronbach's alpha for each scales. I am familiar with using SPSS for calculating Cronbach's alpha, but in this case, I don't know how I do that for MBTI scales. I appreciate your sharing any information about how I can do that.

Wessel Pretorius, Thank you for sharing your thoughts. I am looking for how personality type can affect people's sense of purpose and well-being during the COVID-19 pandemic and working remotely. I appreciate it if you have any ideas about the measuring personality type relevant to this research.

Elnaz Abaei - You just need to score the items numerically. That is, for each scale choose a direction, such that one answer is scored '1' and the other '0.' For example, you might choose to score 'Thinking' responses as ones and 'Feeling' responses as zeroes. Then enter all the items for the scale into the scale reliability function in SPSS. It doesn't matter which direction you opt for, the result will be the same. Or, as I said earlier, you can use dichotomous scores to calculate KR-20 which is just as good an internal consistency measure.

Wessel Pretorius exaggerates when he says that the MBTI is just tea leaf reading, but I will say that it would not be my first choice of self-report inventory for any purpose I can think of. It has improved quite a bit in its more recent editions but still suffers from the basic flaw of placing all respondents into categories (types) rather than preserving the information contained in the dimensional scores. For the purpose you describe, I'd lean toward the NEO-PI-III, 16PF, Multidimensional Personality Questionnaire (MPQ), or Schedule for Nonadaptive and Adaptive Personality (SNAP) over the MBTI. The latter two aren't as well known but are well validated and would be a lot cheaper.

Hi Elnaz (and others), I'm wondering about a few things regarding your request and proposal. I'm not a psychometrician but I've been using, studying and teaching about the MBTI since 1989. There have been several Forms in this period and different manuals, as well as different scoring systems and some different items. So my first question is what MBTI Form you are intending to use and do you know how it works?

For instance, the MBTI is an indicator and it doesn't create the psychological types of Jung. It's a category sort with particular presumptions, described in the relevant manual. I'm unsure how you can make behavioural claims simply dealing with the items.

As personal examples, I answer all of the extraverted-introverted items for I, yet I have no problem giving public talks or running workshops or seminars; I answer all the sensing-intuition items for intuition, but I greatly dislike theory for theory's sake and think facts are important. So there's a bit of nuance, and things like age, gender, education and so on can be important variables. This is why the MBTI results aren't standalone and require appropriate feedback that isn't merely telling someone their results.

These types do not represent a theory of behaviour, because people can do the same thing, for different reasons, and they're about preference, which means that I can prefer to do something, for instance regarding Covid isolation, but there are other factors (living circumstances, support group, open space, employment etc etc.) that may make me decide to do something else, or nothing. The MBTI is also not a clinical instrument and has no lie scale.

So I would be interested in your rationale.

Of course, a person can identify themselves as a particular psychological type without taking the MBTI or other reliable and valid instrument.

I can also refer you to someone psychometrically knowledgeable who has worked on the MBTI revisions, if you wish.

Regards

Peter