Testing hypotheses about ordinal interactions: Simulations and further comments.

1989 ◽  
Vol 74 (2) ◽  
pp. 247-252 ◽  
Author(s):  
Michael J. Strube ◽  
Philip Bobko
Keyword(s):  
1979 ◽  
Vol 6 (1) ◽  
pp. 85-92 ◽  
Author(s):  
Harold J. Hietala ◽  
Angela E. Close
Keyword(s):  

Author(s):  
Maximilian Hirschfeld ◽  
Christine Dudgeon ◽  
Marcus Sheaves ◽  
Adam Barnett ◽  
Aaron MacNeil

Author(s):  
Wilmar Salo ◽  
William C. Auferheide ◽  
Michael Madden ◽  
John Streitz ◽  
Jane Buikstra ◽  
...  

Ancient DNA methodology was applied to extract and amplify a segment of kinetoplast DNA of Trypanosoma cruzi in soft tissue specimens from about 300 spontaneously mummified human bodies from the Atacama Desert in northern Chile and southern Peru. A DNA probe was then employed to hybridize with the amplicon. Results indicate that about 41% of the population in that geographic area were infected with the trypanosome over the past 9000 years. The epidemiological implications of these findings are discussed. It is also emphasized that this and several other paleoepidemiological studies in progress have established that population-study cohorts of mummies now can generate statistically valid paleoepidemiological investigations capable of testing hypotheses. These reflect the maturation of the academic discipline of the scientific study of mummies.


2021 ◽  
pp. 002242782110489
Author(s):  
Wade C. Jacobsen ◽  
Daniel T. Ragan ◽  
Mei Yang ◽  
Emily L. Nadel ◽  
Mark E. Feinberg

Objectives: We examine the impacts of adolescent arrest on friendship networks. In particular, we extend labeling theory by testing hypotheses for three potential mechanisms of interpersonal exclusion related to the stigma of arrest: rejection, withdrawal, and homophily. Method: We use longitudinal data on 48 peer networks from PROSPER, a study of rural youth followed through middle and high school. We test our hypotheses using stochastic actor–based models. Results: Our findings suggest that arrested youth are less likely to receive friendship ties from school peers and are also less likely to extend them. Moreover, these negative associations are attenuated by higher levels of risky behaviors among peers, suggesting that results are driven by exclusion from normative rather than nonnormative friendships. We find evidence of homophily on arrest but it appears to be driven by other selection mechanisms rather than a direct preference for similarity on arrest. Conclusions: Overall, our findings speak to how an arrest may foster social exclusion in rural schools, thereby limiting social capital for already disadvantaged youth.


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