pseudoreplication

  1. 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...
  2. S

    [R - nlme] non-linear regression Michaelis-Menten model

    Hello, I am attempting to model Michaelis-Menten uptake kinetics to predict denitrification rates (response) across a gradient of nitrate loading (predictor) in four seasons (June, August, October, and December) using a mixed effects model. The basic models run well in the nls program in R and...
  3. 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...
  4. M

    How do we avoid pseudoreplication while examining stickleback-gender in perch stomach

    We are working on a project were the sex of sticklebacks in perch stomachs are assesed. The question here is; how do we avoid pseudoreplication? We want to find out if there is a difference in consumption of the different sexes AND we want to find out if the ratio differs from the sex-ratio...
  5. G

    Stratification criteria mess up the use of a random factor?

    Hi! In my study on kelp I want to see how wave exposure and current (both continuous variables) affect kelp physical measures along the Norwegian coast. To assure a balanced design, I stratified my study area into 9 different classes, defined by all combinations of three levels of wave...
  6. M

    canonical correlation and pseudoreplication

    Hello I have just joined Talk Stats and was hoping you all might be able to give me some advice. I have used a canonical correlation analysis to analyse data where I quantified the behaviour of animals at different sites in relation to the characteristics of the sites. A colleague has...
  7. B

    repeated measures subject with n>1?

    I am analyzing a repeated-measures dataset in SAS using proc mixed, and I'm stumped about the repeated measures subject. Here's the design of the experiment: I have forest plots, each containing 100 trees, and randomly assigned to contain 1, 2, 4, or 8 different genetic clones per plot...
  8. A

    Source of Pseudoreplication in data?

    Hi, As part of my dissertation, I'm going to be doing an Anova, comparing the "dead zone" diameters on plates of microbial growth with little paper disks "loaded" with antimicrobial, a clear zone appears where death occurs, the size depending on the strength and succeptibility. So it's basically...