1. testing of cassava price stillness in Order to realize market 2 routes of Integration (d) levels.2. to find out the difference of both, which makes all information songklai is the yield of cassava price line in the market trading and yield of cassava price line in advance of the country's agricultural products market, Thai.3. test whether or not there is ARCH and GARCH. In order to have a cassava price fluctuations in line 2 price.4. making estimates for the relationship of the fluctuations of prices in line with the price of tapioca 2 Quantile method by determine the relationship that the khwon tile level 0.1, 0.2, ..., 0.9, respectively.
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