search

kiuliani / geoda

Automatically exported from code.google.com/p/geoda
GNU General Public License v3.0
0 stars 0 forks source link

Last digit difference in spatial lag model btw Legacy and OG #19

Open GoogleCodeExporter opened 8 years ago

GoogleCodeExporter commented 8 years ago 
from Sep 14, 2011

Data: Baltimore
Win ..15.7

Last digit differs in spatial lag model (they match in spatial error model) - 
not sure we care but wanted to log it in case we do:

Regression.OLS = Legacy
baltRegression.txt = OG ..15.7

OG - Spatial Lag
CONSTANT      5.950557       4.830249       1.231936    0.2179732
       LOTSZ    0.09989266     0.01685041       5.928204    0.0000000

Legacy
    CONSTANT      5.950559       4.830249       1.231936    0.2179730
       LOTSZ    0.09989267     0.01685041       5.928204    0.0000000

Another note: In OG the Regression Report viewer stops displaying text after a 
while, so if output is long it won't display the whole thing (but all output is 
saved if people want to view it outside).

from Sep 15, 2011
These differences are only in the 7th decimal place, and even then, the 
difference is at most by two thenths in that place.  Some of the math libraries 
in GeoDa are different than those used in Legacy, so I think that differences 
of this magnitude should be expected.  Moving to future.

Original issue reported on code.google.com by mmcc...@gmail.com on 5 Mar 2013 at 6:04