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The use of covariates in block designs is necessary when the covariates cannot be controlled like the blocking factor in the experiment.
Side of the fish cage was used as a blocking factor in the experimental design and had a significant effect on final oyster size; at the end of the study, oysters at the farm were either significantly larger or not significantly different than oysters at the reference site, depending on the side of deployment.
Including 'block' as a blocking factor in the GLM allowed us to control for between-block variation, thereby reducing variance in the data and increasing test sensitivity [52], [53].
For the analysis of the pup retrieval test, we included "PND" as a blocking factor in the statistical design in order to account for variation due to the testing day.
Based on the 2×2 factorial design of the heterogenized condition, and to account for microenvironmental differences due to cage position in the rack, each experiment was divided into the four blocks of cage pairs, and 'block' included as a blocking factor in the GLM: y = strain + block.
The blocking factor in the design was included in each model.
Similar(53)
Replicates were treated as blocking factors in the linear model using limma [ 61] and empirical Bayes-moderated t tests were performed.
It is concluded that the leucocyte adherence inhibiton test may offer a simple method of assaying for serum blocking factors in sequential studies but will be of little value in the diagnosis of large bowel cancer.
Blocking factors in the ANCOVA will adjust for the effects randomisation group, case ordering and recruiting centre, with student GEM status and gender as covariates.
We found a much lower number of triploid XXY cells compared to diploid XX cells that initiated XCI at day 3, despite the fact that the concentration of the molecules making up the blocking factor would be the same in both cell lines.
Convergence rates were excellent for all models, with the worst case being non-convergence for four genes when a blocking factor was included in the model.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com