如题，interaction交互作用的各种指标。

RERI：The relative excess risk due to interaction

AP:the attributable proportion due to interaction

S:the synergy index.

1.Discacciati, Andrea et al. “Med4way: a Stata command to investigate mediating and interactive mechanisms using the four-way effect decomposition.” International journal of epidemiology, 10.1093/ije/dyy236. 16 Nov. 2018, doi:10.1093/ije/dyy236

2.Andersson, Tomas et al. “Calculating measures of biological interaction.” European journal of epidemiology vol. 20,7 (2005): 575-9. doi:10.1007/s10654-005-7835-x