is it possible to sample randomly why random sampling is impossible what is it called when you do random sampling why is it difficult to sample randomly in data analysis how does sampling work which method do you use for sampling why does random sampling work how does random sampling work why do you sample randomly how can i find the most likely portfolio for the future why do we need random sampling in research why is random sampling in portfolios impossible why random sampling is not feasible why do you do random sampling? why do you do random sampling how do you use sample sampling in portfolio modeling which problem arises when you take data randomly do portfolios work randomly why is sampling so difficult why would you be doing random sampling