In public, Dr. Twenge has used her knack for cultural criticism and an innovative but controversial approach to cross-generational data analysis to propel the narcissism debate into the mainstream.
In the case of the Miami blue butterfly, as well as many other endangered taxa, there is no gene flow between populations and thus temporal estimators may be more useful (if multi-generational data are available).
22 To the best of our knowledge, there are no other reported human cross-generational data sets in the literature with four grandparental lines and three time points of measured BMI, so this is an original contribution to the scientific literature.
However, as these differences did not significantly interact with the effects of interest (that is, dose, antibiotic type and generational effects), data have been pooled and clone-specific differences are not presented.
Wells, in a recent commentary, indicates the need for such cross-generational grandparental data to understand more fully the influence of maternal and paternal lineages on growth and development.
In essence, he acknowledged that this process will take a very long time and require a series of generational handoffs, as data and options evolve.
Alternatively, we present here the results of a more general and performance oriented approach which should work well on many forms of input data where generational polymorphism occurs.
Moreover, to estimate generational Ne from demographic data, parents and their offspring should be counted at the same life stage.
The study population was largely drawn from a fairly deprived inner-city area, so the inclusion of more participants with a higher SES would be useful in unpacking some of the social and generational aspects of the data.
