Consider a two-class case with classes fraudulent and nonfraudulent. A data mining routine has been applied to a transaction dataset and has classified 50 records as fraudulent (30 correctly so) and 950 as nonfraudulent (920 correctly so). Calculate the overall error rate: (er) and the overall accuracy (ac). Hints: construct the classification matrix before calculating them. Answer for er is __________ Answer for ar is __________

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Types of database architectures

A Database Architecture represents the Database Management System’s (DBMS) design (schema). The DBMS architecture makes it easy to understand the components involved in the database system and their relations. The DBMS architecture may vary based on the system on which it runs. Some systems contain both client and server machines whereas some run only on a server machine. Based on the architecture, the system can be classified as centralized, decentralized, or hierarchical.