Please be more specific. What are the differences between ANOVA and LSD that give you concern?
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
Baltimore, MD 21201-1524
(Fax) 410-605-7913 (Please call phone number above prior to faxing)
>>> Roberto <[hidden email]> 11/19/2011 6:10 AM >>>
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)
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
> First of all, thank you for the reply to my topic.
> Anova summary has shown no significative difference into Treatment (Pr
> 0.374), otherwise LSD Test has shown difference between 2 Treatment.
> I suppose that's something strange.
It isn't. You need to read up on "familywise error rate" and its connection to LSD and Tukey HSD tests (Google gets you there soon enough; I doubt people in here will rewrite textbook material just for you).
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Email: [hidden email] Priv: [hidden email]