This preview shows page 1. Sign up to view the full content.
Unformatted text preview: etric distributions,
( i.e., mean[log(Y)] = median[log(Y)]
Since the log transformation preserves ordering,
median[log(Y)] = log[median(Y)] (typo in book)
%erefore, mean[log(Y)] = log[median(Y)]
Mean (log(Y)) ~ log (median(Y)) Log Transformations (cont.)
Log transformation on two groups of data
( Positively skewed data
( Log transformation makes the distribution more symmetric
( Let Z1 = mean[log(Y1)] = log[median(Y1)]
( Let Z2 = mean[log(Y2)] = log[median(Y2)]
%en Z2 - Z1 = log[median(Y2)] - log[median(Y1)]
!"#$%&(Y1 ) CHAPTER 3
!e End 34...
View Full Document
This note was uploaded on 10/03/2011 for the course STAT 511 taught by Professor Eggett,d during the Winter '08 term at BYU.
- Winter '08