data list notable list /snr * err * . begin data. 10 -23.4377 10 -0.00025 10 -15.625 10 -7.8125 10 31.2495 10 -23.4375 10 -50.781 10 23.4375 20 -7.8125 20 -7.8125 20 15.6245 20 -7.81275 20 7.8125 20 7.81275 20 0.0005 20 -7.813 20 3.90575 20 -27.3435 20 3.9065 20 11.7185 30 3.906 30 0 30 7.812 30 0 30 3.906 30 7.8125 30 -3.906 30 3.90625 30 -7.813 30 3.90575 30 -3.90625 30 -11.7182 30 -0.00025 30 0.00025 end data. examine err by snr /nototal /statistics=descriptives.