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I will try again :-S in the attached, the "data" represents the quantity being ordered for each month for the plastic product. what will be the estimated equation if i want to forecast on monthly basis the demand on this product?!

i have attached the ARTB1 product data its for plastic demand, i need an equation to forecast the demand on this product, can you please help me on this?! :-)

what i need exactly an equation for the attached data by using the least square method

How can we estimate an equation for certain products? For Example I have 3 products the demand on the first two products are seasonality demand wihle its normal demand on the third product? The problem that i face is that i don't know how to estimate the equation and what are the coefficients that s...