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function pred = quad_regress_pred(price, quantity)
days = size(price, 1) - size(quantity, 1);
product_count = size(price, 2);
test_count = size(quantity, 1);
test_set = 1:test_count;
pred_set = test_count+1:size(price, 1);
pred = zeros(days, product_count);
for i = 1:product_count
abc = regress2(price(test_set, i), quantity(test_set, i));
pred(:, i) = polyval(abc, price(pred_set, i));
end
endfunction
function abc = regress2(x, y)
abc = [ x.^2 x ones(length(x), 1) ] \ y;
endfunction
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