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freshs:documentation [2016/03/03 13:20]
josh Broke out a new section on postprocessing
freshs:documentation [2016/03/03 13:21] (current)
josh
Line 383: Line 383:
 The FFS and flatPERM-FFS algorithms continue sampling at each interface until a fixed number of shots progress to the next interface. This type of trial produces successes according to a negative binomial distribution:​ for a single trial, the success probability is estimated simply as the proportion of successful shots; however for multiple trials (multiple independent FFS/​FFS-flatPERM calculations) the correct averaging to determine the success probability is N_success / (<​N_fails>​ + N_success). ​ The number of failures must be saved and averaged in order to then find the expected success rate. The FFS and flatPERM-FFS algorithms continue sampling at each interface until a fixed number of shots progress to the next interface. This type of trial produces successes according to a negative binomial distribution:​ for a single trial, the success probability is estimated simply as the proportion of successful shots; however for multiple trials (multiple independent FFS/​FFS-flatPERM calculations) the correct averaging to determine the success probability is N_success / (<​N_fails>​ + N_success). ​ The number of failures must be saved and averaged in order to then find the expected success rate.
  
-When combining multiple independent simulations,​ the structure of the interfaces must be the same place for each calculation,​ and the shot databases post-processed to get the correct averages. ​ Automatic interface placement is therefore contraindicated in this case.  Only the probability of success (the total statistical weight) needs to be corrected for this effect; the proportional statistical weights of individual trajectories relative to each other remain correct.+When combining multiple independent simulations,​ the structure of the interfaces must be the same for each calculation,​ and the shot databases post-processed to get the correct averages. ​ Automatic interface placement is therefore contraindicated in this case.  Only the probability of success (the total statistical weight) needs to be corrected for this effect; the proportional statistical weights of individual trajectories relative to each other remain correct.
  
 ==== Using the SQLITE Database of Trajectory Fragments ==== ==== Using the SQLITE Database of Trajectory Fragments ====
freshs/documentation.1457007640.txt.gz · Last modified: 2016/03/03 13:20 by josh