https://www.youtube.com/watch?v=ZaPV1OSEpHw&t=1419s

Judea Pearl Lecture

Pearl, J., & Mackenzie, D. (2019). The Book of Why. Penguin : 
[search.lib.umich.edu/catalog/record/016899333?query=the+book+of+why&library=All+Libraries](https://search.lib.umich.edu/catalog/record/016899333?query=the+book+of+why&library=All+Libraries) 

University of Michigan - Ann Arbor

Inheritance of fur color in guinea pigs does not follow Mendelian laws. Sewell Wright postulated that this was because of 'developmental factors' (*d* ). He tried to find *d* by solving mathematical equations where *d* and hereditary factors *h* were the unknowns.

Wright showed that knowing *d* and *h* helped predict correlations, and drew a path diagram that allowed him to identify the causes after knowing correlations.

Reference : Pearl, J., & Mackenzie, D. (2019). The Book of Why. Penguin

S Wright's Guinea Pigs and the "First link between Causality and Probability"

The path diagram Wright used to analyze inheritance of fur color in guinea pigs. 

D denotes developmental factors, E denotes environmental factors, G means the genetic factors from each individual parent, H means the combined hereditary factors from both parents, and O stands for offspring. The small letters, called path coeffecients, represent the strength of effects.

Learn Before

Related

Learn After