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Is greater ability to write well i.e. analysis of books/literature/research papers associated with higher I.Q. scores? Statistically speaking, is writing ability normally distributed like I.Q. is?

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  • $\begingroup$ Probably yes to both without looking at any literature, just given how IQ is tested/construed... it has verbal part in some tests. Why do you suspect it could be otherwise? Or are you (better) asking about the degree of association? $\endgroup$ – Fizz Jul 7 '18 at 19:06
  • $\begingroup$ What's the correlation? $\endgroup$ – user19731 Jul 7 '18 at 19:07
  • $\begingroup$ Could you clarify about how you would evaluate someone's ability to write good analysis objectively? Once this is defined, it would be easier to search whether it correlates with IQ. $\endgroup$ – Seanny123 Jul 8 '18 at 21:51
  • $\begingroup$ The SAT, a standardized reasoning test, has both a reading and a writing component (As well as a mathematics component). It is very well known in the psychometric literature that the SAT correlates substantially with IQ. In fact, the SAT is a fairly good proxy for an IQ test. From this we can conclude fairly confidently that writing/reading correlates with IQ. $\endgroup$ – Eff Jul 9 '18 at 10:36
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The second question (normality) is somewhat easier to answer because it depends less on the exact measures used.

reading and writing abilities are normally distributed in the general education framework.

Meaning for people who are actually schooled and tested (in the US for the above study). The sample for the above was "316 boys and girls who were assessed annually in grades 1 through 4".

As for the first question (association between IQ and writing ability), the qualitative answer is obviously going to be yes. There is even one proposal to use samples of written text to estimate the writer's IQ!

The primary focus of this research is to introduce a method of measuring an individual’s IQ by analyzing the vocabulary in said individual’s writing. In this paper, we show that the ratio of SAT words in a dataset of writing samples is roughly normally distributed, though with an obvious left skew. We go on to show a method that can be used to calculate an individual’s IQ with this ratio and provide samples with measured accuracy.

Alas, the claim isn't terribly well supported because the IQ was self-reported for the sample they used to test their assumption.

Found a study relating to 2nd laguage acquisition:

The result of this study revealed that IQ made significant contribution in predicting reading comprehension (23.42%) and writing achievement (16.08%).

I don't have the full text, and the abstract isn't terribly clear, but presumably the amount of langauge education was standardized somehow... otherwise this result makes little sense.

From a more elaborate study (primary language) there are various intermediate factors affecting the various measures of writing quality... but most of these intermediate factors correlated with non-verbal IQ as well: enter image description here enter image description here

As shown in Table 3, there were moderate correlations between the scores on the cognitive background tests, except for the measure of attention in dichotic listening which did not correlate significantly with any of the other variables. [...]

While the narrative product measures were significantly correlated with a number of cognitive abilities, the narrative process measures were only correlated with reading and spelling skills (see Table 6). Children with better reading and spelling abilities made more online revisions than their peers. Moreover, children who were good spellers transcribed faster than their peers. The cognitive measure of selective attention was significantly associated with the ability to use capitalization and punctuation in writing.

[...] Although narrative macrostructural quality was correlated with a number of cognitive measures, only oral language skills and spelling were significant predictors in the final model, implying that the other measures did not significantly add to the model’s prediction.

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