days of observation when a factor is different between two given days what is the difference between the start and border factors how to determine the difference between start and cross border factor which non-parametric method would you suggest to clarify if the difference or ratio of start and cross border factors is different between two given days? when do you compare the different factors? what is the ratio of start and cross border factors? how long will it take a particle to cross a border? what is the difference between start and cross border time which non-parametric method would you suggest to clarify if the start and cross border factors is different between two given days? how do you find if the start and cross border factor is different which nonparametric method would you suggest to clarify if the difference or ratio of start and cross border factors is different between two given days? when comparing factors for start and cross border, what is the ratio for all the variables? what is the ratio of start and cross borders how do you compare time to the start how to check if a change in the starting factor is different? what's the difference between days of observation and the days of detection? how to compare the difference and the ratio of start and cross border factors? what is the time interval between observations what ratio is the difference from day to day