Editing Statistics and Statistical Programming (Fall 2020)/pset4 (section)

=== RQ2. Emotional contagion (revisited) ===

Revisit the paper we read a couple of weeks ago:
: Kramer, Adam D. I., Jamie E. Guillory, and Jeffrey T. Hancock. 2014. Experimental Evidence of Massive-Scale Emotional Contagion through Social Networks. ''Proceedings of the National Academy of Sciences'' 111(24):8788–90. [[http://www.pnas.org/content/111/24/8788.full Open Access]]

Come to class prepared to discuss your answers to the following questions. 

==== RQ2a. Hypotheses ====
Write down, in your own words, the key pairs of null/alternative hypotheses tested in the paper (hint: the four pairs that correspond to the main effects represented in the figure).
====RQ2b. Describe the effects ====
Describe, in your own words, the main effects estimated in the paper for these four key pairs of hypotheses.
====RQ2c. Statistical vs. practical significance ====
The authors report ''[https://en.wikipedia.org/wiki/Effect_size#Cohen's_d Cohen's d]'' along with their regression estimates of the main effects. Look up the formula for ''Cohen's d.'' Discuss the ''substantive'' or ''practical'' significance of the estimates given the magnitudes of the ''d'' values reported.