Box Plot from Scientific Research

Signal frequency of four categories of amino acids. The signal frequency of amino acids with a polar side chain is significantly higher than that of amino acids with a non-polar side chain. Statistical analysis was done using the Wilcoxon rank-sum test ( P = 0.04 and 1.73 x 10 –7 , two-sided). Midline, median; box limits, 25th (Q1) and 75th (Q3) percentiles; whiskers, Q3 + 1.5 x IQR and Q1 – 1.5 x IQR; IQR, interquartile range. The asterisks indicate the statistical significance (* and **** represent P 0.05 and P 0.0001, respectively).

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