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function pred = log_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
ab = regress(log(price(test_set, i)), quantity(test_set, i));
pred(:, i) = polyval(ab, log(price(pred_set, i)));
end
endfunction
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