If you are on Windows, create a batch file which will run the SQL script to analyze the schema. The batch and SQL files are below:
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set oracle_sid=db02
sqlplus internal @d:\oracle\scripts\analyze_schema
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spool d:\oracle\scripts\analyze_schema.log
exec dbms_stats.gather_schema_stats('SCHEMA_USER', 35, FALSE, 'FOR ALL COLUMNS SIZE 1', 2, 'DEFAULT', FALSE);
spool off
exit
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Then simpel schedule the batch file with "at" . For UNIX - small changes and cron will do the same for you.
Hope that helps,
clio_usa - OCP - DBA