[R-sig-ME] Mixed linear model with nested and interaction term
Lin, Heng-An
henganl2 at illinois.edu
Fri May 4 22:15:30 CEST 2018
** Sorry I didn't notice that the format of the previous email was off, so I just send the same email again
Here is my SAS syntax and output :
proc mixed data=A method=type3; class Location Block Treatment;
model Yield= Treatment/ddfm=kr;
random Location Location*Treatment Block(Location);
run;quit;
Source Df Sum_of_squares F_value
Treatment 4 46.196951 0.41
Location 2 4670.0979652 44.74
Location*Treatment 8 224.44332 1.66
Block (Location) 9 369.782487 2.43
Residual 34 574.051330
And here is R output:
> anova(model_MW)
Analysis of Variance Table
Df Sum Sq Mean Sq F value
Treatment 4 34.847 8.7118 0.5085
I am not sure why the sum of square, and the F- value are different.
Maybe is because I use type III in SAS and in lmer is using REML?
I would also like to check the sum of square of other factors as SAS did, is there any way could do this in lmer?
I am really new to this, Thanks for your time!
Heng-An
________________________________________
從: R-sig-mixed-models [r-sig-mixed-models-bounces at r-project.org] 代表 Lin, Heng-An [henganl2 at illinois.edu]
寄件日期: 2018年5月4日 下午 02:36
至: Ben Bolker
副本: r-sig-mixed-models at r-project.org
主旨: Re: [R-sig-ME] Mixed linear model with nested and interaction term
Thanks!!
Here is my SAS syntax and output :
proc mixed data=A method=type3; class Location Block Treatment;
model Yield= Treatment/ddfm=kr;
random Location Location*Treatment Block(Location);
run;quit;
Source
DF
Sum of Squares
Mean Square
Error DF
F Value
Pr > F
Treatment
4
46.196951
11.549238
8.0509
0.41
0.7954
Location
2
4670.979652
2335.489826
9.2885
44.74
<.0001
Location*Treatment
8
224.443332
28.055417
34
1.66
0.1442
Block(Location)
9
369.782487
41.086943
34
2.43
0.0295
Residual
34
574.051330
16.883863
.
.
.
And here is R output:
> anova(model_MW)
Analysis of Variance Table
Df Sum Sq Mean Sq F value
Treatment 4 34.847 8.7118 0.5085
I am not sure why the sum of square, and the F- value are different.
Maybe is because I use type III in SAS and in lmer is using REML?
I would also like to check the sum of square of other factors as SAS did, is there any way could do this in lmer?
I am really new to this, Thanks for your time!
Heng-An
________________________________________
�q: Ben Bolker [bbolker at gmail.com]
�H����: 2018�~5��4�� �U�� 01:39
��: Lin, Heng-An
�ƥ�: r-sig-mixed-models at r-project.org
�D��: Re: [R-sig-ME] Mixed linear model with nested and interaction term
This seems like a reasonable model specification. Can you show us
the results you're getting from R and SAS, and your SAS syntax (some
people here understand that language), so that we can see what looks
different? (It would help if you also wrote a few sentences about
what you see as the important differences between the results.)
On Fri, May 4, 2018 at 2:30 PM, Lin, Heng-An <henganl2 at illinois.edu> wrote:
> Hi all,
>
> I am analyzing my data with following model,
>
> model1 <- lmer(Yield~Treatment+(1|Location)+(1|Location:Treatment)+(1|Location:Block), data=A)
>
> in here, I want to set an random interaction term (Location*treatment) and an random nested term (block nested within location).
>
> But I couldn't get similar ANOVA results when I compare the output with SAS porc mixed output.
>
> So, I think i might make some mistake in the model in R...
>
> Can anyone give me some suggestion?
>
> Thanks in advance!
>
> Heng-An
>
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>
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