а)Стохастическая зависимость необязательно подразумевает связь функциональную; б)Случайные величины могут
быть зависимы, но некореллированы.
OK, that quite well may be. Although I would prefer to have any proof of the possibility to predict the trend by using the price series, before I try to do this in practice. It is always better to understand what you are doing. Maybe I am trying to be too rigorous.
