This paper is a replication of "Evidence for a Paternal Age Effect on Leftism" without dichotomization and the result here looks more convincing than last time. The variables of interest now contain more questionnaires related to each dimension (LGBT, BLM, feminism), which greatly improves upon the last study. I'm going to focus mainly on the presentation and method.
The first surveys 1175 white American men and gives them the general leftism test, and asks their father’s age when they were born.
I highly recommend displaying mean and SD of age for this sample. Same goes for the second survey with fathers over 50 yrs old.
These dimensions are hypothesized to be common to empire decline, and covary due to being the result of mutational pressure on the same genes.
Need references.
By pre-hoc design, the three factors were summed and a general factor was derived by varimax factor analysis on these sums.
The sentence is very confusing. These three factors I believe refer to LGBT, BLM, feminism. Factor is a term used for latent variable, not observed variable. If you summed R1-R6, G1-G6, F1-F6 before factor analyzing them, you should refer to them not as factors but as sum scores. Also, you should check whether the distribution of these three sum scores is normal prior to factor analysis.
Now, about "varimax factor analysis". First, I understand what you mean, but it needs to be properly written, e.g., factor analysis with varimax rotation. Second, I wish the choice of the rotation method is discussed with respect to varimax because this rotation specifies that the factors (i.e., LGBT, BLM, feminism factors) are uncorrelated. Refer to the discussion in the following paper:
Fabrigar, L. R., Wegener, D. T., MacCallum, R. C., & Strahan, E. J. (1999). Evaluating the use of exploratory factor analysis in psychological research. Psychological Methods, 4, 272–299.
Also, I wouldn't use rotation if the purpose is to get a general factor score, especially from a one-factor solution, to be used in a regression analysis. I'm not sure I understand the purpose of it.
The full data will be publicly available on the author’s Github if you wish to verify this.
Never use "you" in a paper.
Figures 1-4 and 7-8 are not cited/discussed in the main text, the figures are just merely presented out of nowhere.
The title in figures 5-6 ends with a dot, but only for figures 5-6. Better be consistent: using it for all figures or none. Also, Figure 6 is actually a table.
Study 1 subsection must appear under Result section. Regarding the result section, I wish there is a general presentation of the result for both study 1 and study 2. As it stands now, it feels like a low effort presentation of the result section. For instance, Figures 4 and 5 are described with two short sentences. No mention of numbers of interest (especially Figures 5 and 7). I know the readers can zoom in to check the numbers in the figures, but the author is accountable for presenting the result properly, in a more academic way.
About this table, you included an interaction variable (age*paternal age) without mentioning it in the main text. Please provide an explanation as to why you want to use this interaction variable. In your earlier study, you did not include this interaction variable. Moreover, the notes under the table indicates you use robust standard errors. This is another detail not mentioned in the text and it should be made clear why you opted for robust SE. I also don't understand this sentence here:
We find that in the multiple regression model, the correlation of leftism with paternal age decreased by less than 0.01
The number is not what I see in the table. And shouldn't the relationship be positive and not negative? Also, it is more accurate to refer to the effect as beta regression β instead of correlation, to avoid confusion. Eventually, mention in the main text the p value or, better, the confidence intervals along with the β estimate.
For IQ, which likely has a similar, but orthogonal, genetic structure to conservatism, a paternal age correlation of a similar magnitude has been found [9]. This did not weaken when controlled for maternal age, but the analysis lacked the power to properly control for birth order
I would rewrite the sentence as, e.g., "... of a similar magnitude has been found by Wang [9]. In their study, this did not weaken..." since the entire paragraph speaks about Wang's study rather than the current study. I find it clearer.
Based on the results, we conclude that there is compelling evidence for a paternal age effect for leftism. The next step is molecular confirmation. Studies which confirm the role of de novo mutation...
The conclusion (or discussion) displays only one short sentence on the results. This is a meager presentation.
Mental illness correlates with leftism on other scales
Provide a reference.
The decline of asabiyyah [5] seems to be a general feature of empire decline.
For convenience, define asabiyyah in the paper, even briefly.
F2. The country would be better if women couldn't vote. (-1)
Age allows one to estimate the base mutational load of an individual's generation while
8. Angrist, J. D., & Pischke, J. S. (2009). Mostly harmless econometrics: An empiricist's
Make sure the marks are curly, not straight, for consistency. Other single marks are all curly.
Bronski, J (2023) Quantitative Sociobiology Manuscript Beta 1.4. Pg. 48
There should be a dot after J, and after 48. Speaking of this reference, it doesn't appear in the main text. I also wasn't able to find this reference. The closest I found was this article (Beta 1.3 however, not 1.4): https://www.josephbronski.com/p/quantitative-sociobiology-manuscript. Unfortunately, it is restricted to paid subscriber, which means a normal reader, even a scholar, won't be able to access it. Perhaps if you want to cite the reference, you can cite the passage at page 48 that you mention, so that readers know exactly the point you have made here without the requirement of accessing the whole article.
The next step for a future study replication should use a more direct question for the variable of left-right ideology such as political views/party.
All in all I have no problem with the methodology of the main analysis, as I once did in your previous article, but the presentation (i.e., write up) needs serious (re)work to make it look more professional.