here...
"The researchers hope that their detailed analysis, which also includes a review of reasons for hesitancy by racial group, will help policymakers identify vaccine-resistant pockets to ensure the country reaches herd immunity."
Under their 'Educational Level' metric, they happened to note that PhDs were least likely to give up their hesitancy to get vaccinated...this is not too surprising, given that they are accustomed to defending their 'hypotheses'...also under that metric was the finding that those with low levels of education (i.e. H.S. or less), there was recent evidence of a reduction in hesitancy in this relatively large group...therefore worthy of further attention and effort.
However, the essence of the report was to help make a meaningful impact toward achieving 'herd immunity' through vaccinations...worrying about PhD's is non-productive on both the numerical and effectiveness levels...it was just an interesting finding.
Does that make any sense to you?...