11.4 BASIC CONCEPTS OF CLASSIFICATION
I s scton w preset th undrlyig cocpts of classificatio as giv
by Fshr (1936) ad giv an xampl illustrating its us. We also briefly
dscuss t coficints from th Fishr discriminant functio.
Sa hav formulatd irt ways of pog and valuating
st functio analyss One mthod of evaluatig the resuts s
what re calld 6f? This approach will be describednext.
Neceay computations arc givn in sections 11.6, 11.11 and 11.13. In
addton discrimiant fuctio aalysis can b viewed as a spcial case of
aoa correlation analysis presnted in Chapter 10. May of th programs
pht out caonical cofficints and graphical output basd upon valuatio
ofaoal vaas. This approach will be discussd in section 11.12.
I geral whn discriminant fuction analysis is usd to discriminate
iw wo groups Fisr's mthod and classification functions are used.
Wc th siaon is among thr or more groups various canonical
arc reported (sctios 11.11 and 11.12). Th canoical cofficints
can b used for th two group cas but hre is no advantage in dong so
Many invstgators find th two group comparisons asir to intrpreta