# Solving Session 2 Recap - Jan. 26, 2020

Jan 26th, 2020
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1. we worked on/looked at this graph: https://bionsgadgets.appspot.com/gadget_forms/acarefstats.html
2. the book referenced in the above website: https://b-ok.cc/book/852591/c08a8f
3. army manual from the graph site: http://www.umich.edu/~umich/fm-34-40-2/
5.
6. explanation of stuff on the graph:
7. index of coincidence:
8. The index of coincidence provides a measure of how likely it is to draw two matching letters by randomly selecting two letters from a given text. The chance of drawing a given letter in the text is (number of times that letter appears / length of the text).
9. https://en.wikipedia.org/wiki/Index_of_coincidence
10. boorishpea's code: https://cdn.discordapp.com/attachments/613165379065217025/671102059151622164/unknown.png
11. https://www.dcode.fr/index-coincidence
12.
13. Kappa value:
14. Cohen's kappa coefficient is a statistic that is used to measure inter-rater reliability for qualitative items. It is generally thought to be a more robust measure than simple percent agreement calculation, as κ takes into account the possibility of the agreement occurring by chance.
15. https://en.wikipedia.org/wiki/Cohen's_kappa
16.
17. also we found some possible words for 0.jpg
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