localized trendline notes

Document Sample
localized trendline notes Powered By Docstoc
					         Localized trendlines

Not all data fits a linear model, and often data
will fluctuate.

We need to take these fluctuations into account
when using data to make predictions.

A Localized trendline is applied to only a section
of the data, and that enable us to make more
accurate predictions.
Table 77 Us Statistical Abstracts
                                                                When to use localized
                         Live births by year
                         1
                                                                    trendlines.

                         1                                1. When you are dealing with data that
   Births in thousands




                         1
                                                          fluctuate and do not fit a linear model
                                                          particularly well.
                         1

                         0                                2. When the pattern of data clearly shifts
                                                          in such a way, that a localized trend
                         0                                would lend to better more reliable
                         0                                prediction.
                             0     0.5          1   1.5
                                         year
Sorce: US department of Health and Human services
 calized


with data that
 inear model


 ta clearly shifts
 zed trend
e reliable

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:4
posted:12/4/2011
language:English
pages:4