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function pred = regress_frequency_removal(price, quantity)
assert(size(quantity, 1) >= 14);
%test_count = size(quantity, 1);
test_count = 14;
test_set = 1:test_count;
pred_set = size(quantity, 1)+1:size(price, 1);
[q2, removed] = remove_sevenday_frequency(quantity(test_set, :));
pred = regress_pred(price([test_set pred_set],:), q2, 1, @log);
pred = fft(pred);
%pred = (pred .* (removed == 0)) + removed;
pred = pred + removed;
pred = real(ifft(pred));
pred = max(pred, 0);
endfunction
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