provided in a control system is to allow manual override of remote installations, either by a serial communication. link, modem, radio or other type of interface. In these installation the field device may be manually controlled until a. problem is corrected or until maintenance personnel can visit the site.
â¢ Doctors want to know how much hearing damage results from loud music. â¢ Teachers want to know whether or not listening to classical music helps students perform better on tests. Statistical investigations are used every day for a variety of reasons.
Accordingly, the first step in any use of administrative data is cleaning and data quality analysis. Simple frequency distributions and cross tabulations of variables of interest can identify the extent to which data in the field are complete and may reveal serious anomalies.