| sscu-package | Strength of Selected Codon Usage |
| akashi_test | akashi test for codon usage |
| genomic_gc3 | genomic gc3 for an multifasta genomic file |
| low_frequency_op | the function identify low frequency optimal codons |
| optimal_codons | Identify optimal codons by using the highly expressed genes method |
| optimal_codons_table | statistics for the optimal codons |
| optimal_codon_statistics | statistics for the optimal codons |
| op_corre_CodonW | Identify optimal codons by using the correlative method from Hershberg & Petrov, the input file is from CodonW |
| op_corre_NCprime | Identify optimal codons by using the correlative method from Hershberg & Petrov, the input file is from NCprime |
| op_highly | Identify optimal codons by using the highly expressed genes method |
| op_highly_stats | statistics for the optimal codons |
| selected_codons | Identify optimal codons by using the highly expressed genes method |
| s_index | S index (Strength of Selected Codon Usage) |