[R-sig-ME] means , CIs from lmer, glmer
Kornbrot, Diana
d.e.kornbrot at herts.ac.uk
Mon Feb 26 18:11:28 CET 2018
I am keen to promote the use of generalised mixed models for the analysis of proportions to psychologists
Have straight fowl code in SPSS [costly] and would like to supply equivalent R Code without ‘tears’
Design is a follows raw frequencies are: FreqPos for ‘success’ and FreqNeg for ‘failure’
Predictors are Rab with 4 levels, repeated over participants and Between with 2 separate groups of participants
Model is binomial with logit link
Require following output to correspond to SPSS output from code below
Descriptive: Means, se and 95% CIs by Rab, by Between and by Rab*Between
Inferential: fo Rab, Between and Rab*Between: F value, MSE, numerator df, denominator df [this enables p-values]
Have tried
logit1 <- glmer(cbind(FreqPos,FreqNeg) ~ Rab + Between + Rab*Between + (1| Participant), family=binomial(link="logit"))
gives F and MSE no denominator df or MSE. Different results to SPSS
nb F=MSE - that can’t be right F is supposed to be ratio of chi-squares
summary (logit1)
gives coefficients and SEs. Different results to SPSS
also tried predicted and fitted but still no means
have spent days searching internet for examples - but none of them seem to show how to get the output I need
All help greatly appreciated
____
Spss syntax
*Generalized Linear Mixed Models.
GENLINMIXED
/DATA_STRUCTURE SUBJECTS=Participant REPEATED_MEASURES=Rab COVARIANCE_TYPE=UNSTRUCTURED
/FIELDS TARGET=FreqPos TRIALS=FIELD(Nmax) OFFSET=NONE
/TARGET_OPTIONS DISTRIBUTION=BINOMIAL LINK=LOGIT
/FIXED EFFECTS=Rab Between Rab*Between USE_INTERCEPT=TRUE
/BUILD_OPTIONS TARGET_CATEGORY_ORDER=DESCENDING INPUTS_CATEGORY_ORDER=DESCENDING MAX_ITERATIONS=100 CONFIDENCE_LEVEL=95 DF_METHOD=SATTERTHWAITE COVB=MODEL PCONVERGE=0.000001(ABSOLUTE) SCORING=0 SINGULAR=0.000000000001
/EMMEANS TABLES=Rab COMPARE=Rab CONTRAST=DEVIATION
/EMMEANS TABLES=Between CONTRAST=NONE
/EMMEANS TABLES=Rab*Between CONTRAST=NONE
/EMMEANS_OPTIONS SCALE=ORIGINAL PADJUST=LSD.
best
Diana
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