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In phylogenetics, the unrooted model of phylogeny and the strict molecular clock model are two extremes of a continuum. Despite their dominance in phylogenetic inference, it is evident that both are biologically unrealistic and that the real evolutionary process lies between these two extremes. Fortunately, intermediate models employing relaxed molecular clocks have been described.


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The Child Trends databank of indicators related to child and youth well-being is no longer being updated so that we can focus on data tools and products core to the work of policymakers and other stakeholders, such as:.

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Additionally, we have a forthcoming interactive tool on childhood poverty we expect to release in late Although dating in adolescence is still common, students in the eighth, tenth, and twelfth grades in were less likely to report dating than their counterparts were in This shift is more pronounced for twelfth-grade students, where the proportion of youth who report they did not date more than tripled, from 15 percent in to 49 percent in In the same period, the proportion of tenth graders who never date increased from 28 to 55 percent, and the proportion of eighth graders increased from 47 to 71 percent.

Much of this increase has come recently, with the proportion of twelfth graders never dating increasing by 7 percentage points from toand the proportion of tenth and eighth graders increasing by 7 and 9 percentage points, respectively, over the same period Appendix 1. In a similar trend, the proportion of teens who report they date more than once a week has been decreasing.

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From tothe percentage of twelfth graders who reported they went on more than one date per week declined from 34 to 14 percent. In the same period, the proportion of tenth graders who reported frequent dating also declined, from 17 to 7 percent.

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The proportion of eighth graders who date frequently remained fairly constant from tobetween 7 and 8 percent. However, the proportion has since decreased, and was 3 percent in Appendix 2.

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Inmore than two-thirds 71 percent of eighth-grade students reported never dating, compared with 55 percent of tenth graders, and 49 percent of twelfth graders Appendix 1. The share of students who date more than once a week increases markedly with age, from 3 percent among eighth-grade students, to 7 percent of tenth-grade students, to 14 percent of twelfth graders, in Appendix 2. Inmale eighth and twelfth graders reported higher rates of frequent dating than their female counterparts, but in tenth grade, the two genders were nearly equally likely to report frequent dating Appendix 2.

Females at all three grade levels were more likely than males to report that they never date, though this gap decreases at higher grade levels Appendix 1. Attitudes and practices around adolescent dating are influenced by cultural, historical, and other factors, including those associated with race and ethnicity.

Non-Hispanic white and Hispanic students in the twelfth grade were more likely than non-Hispanic black students to report they date frequently.

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In16 percent of non-Hispanic white and 15 percent of Hispanic twelfth graders reported frequent dating more than once a weekcompared with 10 percent of non-Hispanic black students. In tenth grade as well, non-Hispanic white and Hispanic students were more likely to date frequently 7 percent among both groups than non-Hispanic black students 5 percent.

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In eighth grade, however, non-Hispanic black students reported the highest rate of frequent dating 5 percentfollowed by Hispanic 4 percent and non-Hispanic white students 2 percent; Appendix 2. In twelfth grade, race and Hispanic origin are also associated with the likelihood of never dating.

In51 percent of Hispanic and 50 percent of non-Hispanic black students reported never dating, followed by 45 percent of non-Hispanic white students. In tenth grade, non-Hispanic white students were less likely to report never dating, at 52 percent incompared with 59 percent of their non-Hispanic black peers, and 54 percent of their Hispanic peers.

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Among eighth graders, non-Hispanic white students reported the highest rate of never dating 72 percentfollowed by their Hispanic and non-Hispanic black peers 70 and 66 percent, respectively; Appendix 1. Inthere was not a clear relationship between parental education and frequent dating.

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Appendix 1. Appendix 2. Frequent dating is used here to describe youth who report going out on more than one date in an average week.

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Child Trends. Dating Among Teens. Publication Date: Dec 18, Share on Facebook Share on Twitter.

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Search Indicators. Trends in dating among teens Although dating in adolescence is still common, students in the eighth, tenth, and twelfth grades in were less likely to report dating than their counterparts were in Differences by age Inmore than two-thirds 71 percent of eighth-grade students reported never dating, compared with 55 percent of tenth graders, and 49 percent of twelfth graders Appendix 1.

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Differences by gender Inmale eighth and twelfth graders reported higher rates of frequent dating than their female counterparts, but in tenth grade, the two genders were nearly equally likely to report frequent dating Appendix 2. Differences by parental education Inthere was not a clear relationship between parental education and frequent dating.

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