“…Researchers such as Tilanus and Theil (1965), Theil (1967), Skolka (1964), Crown (1990), Lee et al (1990), and Madsen and Jensen-Butler (1999) have analyzed the issue from information content perspective. Sample of studies on various aggregation schemes includes Crown (1987Crown ( , 1990, Harrison and Manning (1987), Kymn (1990), Cabrer et al (1991), Dietzenbacher (1992, Oksanen and Williams (1992), and Murray (1998). A partial list of additional notable aggregation related researchers includes Yamada (1961), Green (1964), Ijiri (1971), Kossov (1972), Trainer (1976), Isserman (1977), Miller and Blair (1981), Bulmer- Thomas (1982), OhUallachain (1985, Ralston et al (1986), Garhart and Giarratani (1987), Howe and Johnson (1987), Lahr and Stevens (1987), Theil and Uribe (1992), Olsen (1993), Comer and Jackson (1997), Lee (1997);and Paelinck (2000).…”