Dear all
I have found that the two "equivalent" commands do not produce the same
results.
1. (I wrote this command by hand, this is what I would do usually)
>summary(aov(eduyrs ~ cntry * edf, data=ESS1))
Df Sum Sq Mean Sq F value Pr(>F)
cntry 1 257 256.65 21.2251 4.243e-06 ***
edf 4 11010 2752.42 227.6296 < 2.2e-16 ***
cntry:edf 4 24 6.03 0.4987 0.7367
Residuals 3205 38754 12.09
---
Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
2. (I run this from Rcmdr, this is what my students would normally do)
>AnovaModel.2 <- (lm(eduyrs ~ cntry*edf, data=ESS1))
> Anova(AnovaModel.2)
Anova Table (Type II tests)
Response: eduyrs
Sum Sq Df F value Pr(>F)
cntry 38 1 3.1158 0.07763 .
edf 11010 4 227.6296 < 2e-16 ***
cntry:edf 24 4 0.4987 0.73672
Residuals 38754 3205
---
Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
Unfortunately, the results are different. Could anyone, please, explain why?
Dr. Iasonas Lamprianou
Assistant Professor (Educational Research and Evaluation)
Department of Education Sciences
European University-Cyprus
P.O. Box 22006
1516 Nicosia
Cyprus
Tel.: +357-22-713178
Fax: +357-22-590539
Honorary Research Fellow
Department of Education
The University of Manchester
Oxford Road, Manchester M13 9PL, UK
Tel. 0044 161 275 3485
iasonas.lampria...@manchester.ac.uk
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