Search Results
Search type | Search syntax |
---|---|
Tags | [tag] |
Exact | "words here" |
Author |
user:1234 user:me (yours) |
Score |
score:3 (3+) score:0 (none) |
Answers |
answers:3 (3+) answers:0 (none) isaccepted:yes hasaccepted:no inquestion:1234 |
Views | views:250 |
Code | code:"if (foo != bar)" |
Sections |
title:apples body:"apples oranges" |
URL | url:"*.example.com" |
Saves | in:saves |
Status |
closed:yes duplicate:no migrated:no wiki:no |
Types |
is:question is:answer |
Exclude |
-[tag] -apples |
For more details on advanced search visit our help page |
lme4 and nlme are R packages used for fitting linear, generalized linear and nonlinear mixed effects models. For general questions about mixed models use [mixed-model] tag.
1
vote
1
answer
2k
views
summary(), anova() type 3, Anova() type 3 not producing similar results for lmer model
() type 3 and Anova() type 3
summary() and anova() type 3
I have tried options(contrasts = c("contr.sum", "contr.poly")) and it does not change any results. … I have run my pre-determined contrasts of interest using emmeans, which had high significance, so I'm having a hard time understanding why the Anova() type 3 and summary() aren't showing any significance …
4
votes
1
answer
7k
views
Differences between summary and anova function for multilevel (lmer) model
I have found that the summary() function and the anova() function from lmertest yield different results. … However, I am finding that the anova function does not return a significant interaction effect Origin:Fert, whereas the summary function reports that OriginCO:FertUnfertilized is significant. …
1
vote
1
answer
2k
views
Different p values for anova and summary in lme
Here is the problem: when I run the anova command 'Religion' is significant, but it is not if I then run the summary of the saturated model. … . + Group:Religion)
anova(baseline, GroupM, ReligionM, Group_Rel)
summary(Group_Rel)
and here is the output:
# Model df AIC BIC logLik Test L.Ratio p-value
# baseline 1 5 1822.944 …
0
votes
0
answers
34
views
How do I interpret output of lmer summary and anova
I have created multiple linear mixed effect models to determine the effects of these variables on shannon diversity value.
summary(lmer_model_precip)
Linear mixed model fit by REML ['lmerMod']
Formula: … Error t value
(Intercept) 0.06001 0.01213 4.945
Flower_Quantity -0.02689 0.02739 -0.982
Correlation of Fixed Effects:
(Intr)
Flowr_Qntty -0.778
anova(lmer_model_precip)
Analysis …
7
votes
1
answer
5k
views
Big difference between a t-test and a F-test in a mixed model (anova vs summary in lmerTest)
As can be seen from the summary output below, the t.tests do not show a significant congruity effect (p = 0.12), while the anova output shows a very significant congruity effect (p = 2.8e-10). … I am therefore unsure what causes the very significant result in the anova output. …
1
vote
0
answers
105
views
Why an anova after lme (or lm) [duplicate]
I would like to understand why an anova is made on a lme (or lmer) and how to interpret the anova output.
lm1 <- lme(EWL..mg.h. ~ Condition*Session + Condition*Sex +
Condition*Mass, random = ~1|Individu … ,
data = data_respiro_acoustic)
summary(m1)
Anova(m1, type = c("III"))
Summary Output :
Linear mixed-effects model fit by REML
Data: data_respiro_acoustic
AIC BIC logLik
1232.332 …
2
votes
0
answers
754
views
Discrepancy between `anova` and `summary` outputs with `lmer` in the presence of interactions [duplicate]
However, if I use both anova and summary, I obtain results that I am not sure on how to interpret. … As you can see, the t value from summary is 2.04 and the F value from anova is 0.0416. …
15
votes
1
answer
16k
views
Conflicting results of summary() and anova() for a mixed model with interactions in lmer+lme...
In fact, it seems that the anova(model, type = 3) function is actually using type 2 SS, which we can verify by running anova(model, type = 2). … Here I am running only a single model using lmer and trying to understand why lmerTest::anova(model) and summary(model) are producing different P-values, despite the fact that they should be computed in …
4
votes
1
answer
9k
views
Output of fixed effects summary in lmerTest in R and post-hoc tests
I'm doing a two-factor ANOVA using the lmerTest package. Each factor has multiple levels. … But, I'm unsure how to interpret the summary table produced by summary() and how the numbers compare to the table produced by glht(). …
0
votes
2
answers
304
views
-1 in lmer() fixed effects changing df and ANOVA results
From my understanding, the addition of a -1 in the fixed effects of a lmer() model would avoid comparisons of factor levels to a baseline (e.g. the (intercept) in the model summary). … Prep
library(lmerTest)
mtcars$am<-as.factor(mtcars$am)
Traditional model
M1<-lmer(mpg~am*hp+(1|carb),data=mtcars)
summary(M1)
Estimate Std. …
2
votes
1
answer
3k
views
How to obtain the overall p-values for the main effects and interactions in a glmer model?
(m1) instead of summary(m1) I get:
> anova(m1)
Analysis of Variance Table
Df Sum Sq Mean Sq F value
trt 1 0.024 0.024 0.0238
test 2 89.561 44.780 44.7805
trt:test 2 54.305 27.153 … 27.1525
>
How to get a report like anova(m1) but with associated p-values? …
1
vote
0
answers
886
views
lme with interaction: how to decide which treatment is more efficaceous? how to deal with p ...
My model is
lme(var ~ treatment*period+side,
method="ML",
random=list(IDlog=~1), na.action=na.omit,
data=changes)
This is the anova of the model
numDF denDF F-value p-value … .0001
treatment 2 473 3.49473 0.0311
period 4 473 12.51296 <.0001
side 1 473 12.16210 0.0005
treatment:period 8 473 2.02865 0.0416
and the summary …
2
votes
1
answer
78
views
Type-3 ANOVA vs. t-test for binary variables in mixed effect model
Error t value Pr(>|t|)
Gender2 -0.2443 0.1791 -1.364 0.1731
Information2 0.1605 0.3582 0.448 0.6543
Anova(fm1, type = 3)
Anova Table (Type III tests) … This seems to solve the problem -- presumably lmerTest somehow does this automatically when calling a type 3 ANOVA. With contrast coding, the summary now matches the ANOVA for variables with 1 df. …
0
votes
1
answer
6k
views
Output interpretation of mixed anova with lme4 package in R
Since I have an unbalanced design (16, 19, 14 and 17 obs per group) after removing outliers, I wanted to use the lmer function to run a mixed anova (or mixed model now) in R. … (anova(lmer_mixed_ANOVA,type=3))
print(summary(lmer_mixed_ANOVA))
and I get this as output:
[1] "data_RT_control"
Analysis of Deviance Table (Type III Wald chisquare tests)
Response: control_out …
2
votes
1
answer
206
views
What is the difference between p-values in summary() and p-values given e.g. by emmeans?
I started with a maximal model and used LRTs (anova()) to remove non-significant predictors. … However, how do I know if the levels that are not shown in the summary (i.e. e.g. L23:INSTRUCTION1) are significant? …