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EDA.CENTER.INF
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2009-01-18
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PPPP center estimates of distributions PPPP
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
introduction
@@@@@@@@@@@@ the function center calculates a biweight
estimator of the center of a distribution.
the function accepts numeric vectors and arrays
as its right argument.
parameters there are two parameters which can be set by the
@@@@@@@@@@ user>_
epsilon :default .01" _ proportion by which the sum
of absolute residuals must
be reduced to continue
iterating.
cutoff :default 4" _ value of the biweight
constant.
command syntax
@@@@@@@@@@@@@@ center dddd
comment
@@@@@@@ center estimates are displayed and in addition
are stored in the global variable ce.
PPPP practice PPPP
@@@@@@@@
this work space contains the data set called lobsters.
try the following commands>_
lobsters _display data
center lobsters
cuttoff[10
center lobsters