How to estimate table stats (table only)

DBMS_STATS.gather_table_stats (
        ownname => SYS_CONTEXT ('USERENV', 'CURRENT_SCHEMA'),
        tabname => '',
        estimate_percent => SYS.DBMS_STATS.auto_sample_size,
        method_opt => 'FOR ALL COLUMNS SIZE 1 ',
        DEGREE => NULL, CASCADE => FALSE,
        no_invalidate => FALSE);