Johannes Johow

(Dr. rer. nat., Dipl.-Biol.)

Darwinian / Data Ninjutsu

Welcome,

I am a behavioral ecologist particularly interested in kinship and reproduction within human families. Since I left academia in 2015, I do consulting for data projects (R, SAS, SQL). Occasionally, I chime in on #rstats and applaud people for their magic.

Feel free to browse my portfolio or come back later. And please do not hesitate to drop me a note or ask me on twitter.

Special thanks goes to Yihui Xie for blogdown providing this fertile ground .

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Blog

Consanguinity, land inheritance and risk of grandchildlessness

Abstract: Investigating the reproductive consequences of consanguinity in historical Krummhörn, we show social-group specific …

Feb 25, 2019 4 min read R

Phyllotaxis @Datacamp

UPDATE: Given Datacamp’s catastrophic handling in the case of one of their managers sexual harassement of one of their employees, I …

Feb 13, 2019 6 min read R

Projects

Deep Learning with R

An example of using the in-built project page.

A shinyapp for the Krummhörn

This is an shinyapp demonstrating the functinality of my {kinlab} package for R for analyzing data from the Krummhörn family reconstitution study.

Consanguinity, fertility and offspring survival

The historical population of the Krummhörn was highly stratified according to socioeconmic groups. While the socioeconomically privileged farmers do generally have a higher probability of having at least one grandchild documented within the stationary part of the population, this reproductive advantage seems to be further increased within consanguineous unions.

The "Terminal Investment"-Hypothesis of dizygotic twinning - Historical data from early Québec

Service

I’m currently for hire - just drop me a note!

R

10+ yrs.

SQL

fluent

SAS

SAS 9 certified

Agile

git, jira, TravisCI

APIs

Full-Stack Development

Publish

Automated Reports

Explore

Data exploration

Adapt

Model selection

Predict

Model deployment

Publications

Journal articles

J Johow, KP Willführ, E Voland (2019). High consanguinity promotes intergenerational wealth concentration in socioeconomically privileged Krummhörn families of the 18th and 19th centuries. In Evol Hum Behav.

Preprint PDF Code Dataset Source Document DOI

KP Willführ, J Johow, E Voland (2018). When the mother-in-law is just as good – Differential mortality of reproductive females by family network composition. In PloS ONE.

PDF DOI

J Johow, E Voland (2012). Conditional Grandmother Effects on Age at Marriage, Age at First Birth, and Completed Fertility of Daughters and Daughters-in-law in Historical Krummhörn. In Hum Nat.

PDF DOI

J Johow, M Fox, LA Knapp, E Voland (2011). The presence of a paternal grandmother lengthens interbirth interval following the birth of a granddaughter in Krummhörn (18th and 19th centuries). In Evol Hum Behav.

PDF DOI

M Fox, J Johow, LA Knapp (2010). The Selfish Grandma Gene. The Roles of the X-Chromosome and Paternity Uncertainty in the Evolution of Grandmothering Behavior and Longevity. In IJEB.

PDF Slides DOI

Book chapters

More Publications

K Hawkes, JS Chisholm, LA Fairbanks, J Johow, E Kalcher-Sommersguter, K Liebal, M Myowa, V Sommer, B Thierry, BL Finlay (2017). Primate infancies. Causes and consequences of varying care.. In H. Keller & K. Bard (Ed.) The Cultural Nature of Attachment (MIT Press).

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J Johow, E Voland (2014). Family relations among cooperative breeders. Challenges and offerings to attachment theory from evolutionary anthropology.. In H. Otto, H. Keller (Eds.), Different Faces of Attachment. Cultural Variations on a Universal Human Need. Cambridge University Press.

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J Johow, E Voland E.,, KP Willführ (2013). Reproductive strategies in female postgenerative life. In M. L. Fisher, J. R. Garcia, & R. S. Chang (Eds.), Evolution’s empress. Darwinian perspectives on the nature of women (pp. 243–259). Oxford University Press.

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Other

More Publications

J Johow (2012). Die "Großmutter-Hypothese" und genomische Konflikte. Konditionale Einflüsse von Großmüttern auf reproduktives Verhalten in Familien der ostfriesischen Krummhörn (1720-1874). Kumulative Dissertation, Universitätsbibliothek Gießen.

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J Johow, E Voland (2012). Geschlecht und Geschlechterrolle. Soziobiologische Aspekte. In Bundeszentrale für politische Bildung (Eds.), AUS POLITIK UND ZEITGESCHICHTE (APUZ 20-21; 2012.).

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J Johow, E Voland (2011). Das geteilte Leben. Evolutionäre Gründe der Geschlechterdifferenz.. In H. Fink & R. Rosenzweig (Hrsg.) Mann, Frau, Gehirn - Geschlechterdifferenz und Neurowissenschaft (pp. 133–146). Paderborn. Mentis.

PDF Slides

J Johow (2009). Zwischengeburtenabstände und ’Life History Evolution’-Eine Untersuchung zu reproduktionsstrategischen Mustern in Familien der ostfriesischen Krummhörn des 18. und 19. Jahrhunderts. Diplomarbeit, Justus-Liebig-Universität Gießen.

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