glmm

  1. M

    Problems with GLMM results

    Hi all, I apologize if this is a stupid question, but I'm kinda new to GLMM on SPSS. I'm analyzing non-normal data (hormonal response from primates to different factors) from a 2 year study and I'm having some trouble interpreting my GLMM results. All the results I get give me p=0.000 which I...
  2. B

    How to build a binomial mixed model?

    I have data whose structure is seen in the image below. You see one participant's responses in the second row. M1-4 through F3-6 are trials in which a binary response was made (participant chose one of two stimuli presented on the screen). These were M(ale) and F(emale) stimuli. 1 through...
  3. A

    How to deal with individual pseudoreplication?

    I am trying to deal with pseudoreplication of individuals in my study, and not quite sure how to handle it. I have been trying to account for individuals being sampled multiple times (twice usually) using a GLMM with individual ID as a random intercept. However, I think that the number of ID's...
  4. N

    Generalized Linear Mixed Model NOT running (menu)

    Hello, The analyze>Mixed models>Generalized linear opens and lets me fill in all fields but does not RUN. The same happens with analyze>non-parametric>one sample, independent samples and related samples (but works for the legacy dialogs). I tried to make my own syntax but it returns the XML...
  5. D

    General Linear Mixed Model - how to run!

    Hello, I need some help with how to run a mixed regression with a random factor please! I have a data set with 10 participants, who I conducted observations on multiple times (around 26 observations per participant), so in total I have around 262 observations. For each observation I have 2...
  6. E

    Comparing groups/sites---need advice identifying variables and appropriate tests

    Hi, thank you for reading this and your potential input. This is a research study. I examined the prevalence of parasites in one insect species in an island ecosytem. Insects were collected from: Island 1: 3 sites (all very different elevations) Island 2: 2 sites (similar elevation)...
  7. E

    Generalized Linear Mixed Models without mixed effects. A meaningless question?

    Hi there, I know what fixed and random effects in linear models or GLM are. I am using Generalized Linear Mixed Models (GLMM) to handle this. So far, so good. One point worries me, for months actually. In all textbooks, all websites, etc., GLMM is presented as a method to handle...
  8. R

    Data analysis with a GEE, is my method valid?

    Hi everyone, I’ve been doing some statistical analyses in R on some data. It’s for use in a manuscript I’m hoping to get published in a biological journal. Unfortunately, the tests I ended up having to run are kind of at the limit of my understanding, so I was hoping that I could run through...
  9. H

    Logistic regression vs GLMM

    Hello, I'd like to ask you for help with a choice of correct model for my analysis. Here is the problem: 1.) I should find out whether the risk of stroke after 65 age depends on gender 2.) Find out whether the association of gender with stroke depends on age 3.) Can gender effect on stroke...
  10. S

    In a negative binomial GLM or GLMM what does theta stand for?

    When using a GLM or GLMM with a negative binomial distribution in R it is usually necessary to set the value of theta in the model. But what does theta actually stand for? And how do I caluclate it? I have been able to get around this for now by setting my models to calculate theta for me...
  11. R

    Reading output from GLMM run in R

    Hi, I am a complete novice and dummy when it comes to statistics so I apologise in advance... I have been asked to report the results of my GLMMs (I ran two) in a table. This table must state: effect, standard error, test statistic, and P value, for all fixed effects. Unfortunately I am...
  12. B

    What is the appropriate R tests for studying drug effect under factors disruption?

    Hello biostat world I have a population of 35 mice, 17 are wild type and 18 are treated with drug. I sampled(12 biological replicate) all mice along 5 dates d1 d2 d3 d4 d5 within a period of 8 months , the time interval of sampling is almost the same These mice were been continuously exposed to...
  13. P

    Trouble with random factors glmm

    Hi. I am doing a behavioural ecology study on juvinile brown trout and want to perform a glmm (glmer, package lme4) to analyse the effect of activity, size and treatment on survival. The variables i am using and are: response-survival (dead or alive), fixed effects- size (continuous), activity...
  14. H

    Choice of test in R. Repeated measurements, binary response and missing data...

    I have two treatments and one co-variate (affect the response variable but is also correlated with one of the treatments). Each replicate has been examined for the presence/absence of morphological characters at several time point but there are unfortunately a lot of missing data. What would be...
  15. B

    GLMM Predictor variables

    Hi all, I have a quick question regarding predictor variables in a GLMM analysis, a subject I am new to. I am running a study investigating multi-modal communication in primates. specifically, primate gestures that accompany vocalizations. I have measured the call rate, call duration...
  16. C

    Output format using GENLINMIXED in SPSS

    Hello, I'm new to using the Generalized Linear Mixed Model function (GENLINMIXED) after some experience with the Linear Mixed Model function (MIXED). The GLMM output uses an unfamiliar format returning an interactive presentation rather than straightforward tables as they do in LMM. After...
  17. S

    Using Generalized Linear Mixed Model to extract a predictive formula/graph

    Dear statisticians/SPSS users, A little background information first: As you may or may not know, Rudolph Flesch created a Reading Ease formula in 1948, to be used for easily scoring texts on their comprehensibility by using average sentence length in words and average word length in...
  18. E

    Fitting a distribution to non-normal/linear data in SPSS

    Hi, I am working with non-normal/linear data and I need find the right distributions for my data so I can run GLMMs. Does SPSS has a function to analyze the distribution of your data? E.g. Poisson, log, .....I've found countless tutorials for programs but none for SPSS. Thanks!
  19. A

    How best to account for seasonality when analysing bird monitoring data

    Hello All, I have some monitoring data from seabird surveys carried out in an offshore construction site. Surveys were undertaken before, during and after construction and I am trying to evaluate whether there were significant effects on the observed seabird densities as a result of...
  20. T

    MCMCglmm Beginners Help Needed

    I have data on the success / failure of Wood Warbler nests and wish to examine the data using a GLMM in R. The first few lines of data look like this: nestid year age FED fail pred day phase footpath carpark neighbour lowbranch eggs chicks prov3 prov3pc prov7 prov7pc prov11 prov11pc lastprov...