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Table 1 Frequency distribution of amino acids at the ith position

From: iSuc-ChiDT: a computational method for identifying succinylation sites using statistical difference table encoding and the chi-square decision table classifier

Sample

Amino acid residue

Total

1

2

…

j

…

20

Positive

\( {f}_{i,1}^{+} \)

\( {f}_{i,2}^{+} \)

…

\( {f}_{i,j}^{+} \)

…

\( {f}_{i,20}^{+} \)

\( {f}_i^{+} \)

Negative

\( {f}_{i,1}^{-} \)

\( {f}_{i,2}^{-} \)

…

\( {f}_{i,j}^{-} \)

…

\( {f}_{i,20}^{-} \)

\( {f}_i^{-} \)

Total

fi, 1

fi, 2

…

fi, j

…

fi, 20

N