Roberto,
Please be more specific. What are the differences between ANOVA and LSD that
give you concern?
John
John David Sorkin M.D., Ph.D.
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)
>>> Roberto <rmoscetti at unitus.it> 11/19/2011 6:10 AM
>>>
Dear all,
concerne to my issue, I obtained different results between ANOVA and LSD
TEST (agricolae package), and I ask me why
>anova <- aov(SS ~ Treatment*Lot)
>summary(anova)
Df Sum Sq Mean Sq F value Pr(>F)
Treatment 7 0.0000534 7.622e-06 1.107 0.374
Lot 2 0.0000059 2.954e-06 0.429 0.654
Treatment:Lot 14 0.0001038 7.412e-06 1.077 0.401
Residuals 48 0.0003304 6.883e-06
> LSD.test(anova, "Treatment")
Study:
LSD t Test for SS
Mean Square Error: 6.883013e-06
Trattamento, means and individual ( 95 %) CI
SS std.err replication LCL UCL
A30 0.02966558 0.0019037856 9 0.02583776 0.03349340
AM 0.02844520 0.0005186885 9 0.02740230 0.02948809
C30 0.02913658 0.0006792219 9 0.02777092 0.03050225
CM 0.02964944 0.0005398926 9 0.02856391 0.03073496
T30 0.02979624 0.0006920447 9 0.02840479 0.03118769
TS 0.02891764 0.0004981543 9 0.02791603 0.02991924
V30 0.03112188 0.0005157621 9 0.03008487 0.03215889
VM 0.03087886 0.0006874520 9 0.02949664 0.03226107
alpha: 0.05 ; Df Error: 48
Critical Value of t: 2.010635
Least Significant Difference 0.002486659
Means with the same letter are not significantly different.
Groups, Treatments and means
a A1 0.03112188
ab A2 0.03087886
ab B1 0.02979624
ab C1 0.02966558
ab D1 0.02964944
ab D2 0.02913658
ab B2 0.02891764
b C2 0.0284452
how is it possible? my mistake to set anova?
Best regards,
Roberto
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