search for: insecticide

Hi all, Here is my problem: I performed bioassays using a unique insecticide on 9 different genotypes and got their mortality depending on the dose of insecticide used. Now, I want to see wether some genotypes are different or not in their responses to insecticide. My problem is that I have up to four replicates for some genotypes, but only one for other... Due to this unba...

Hi, In my analysis of impacts of insecticide-treated bednets on malaria, I look at the relationship between malaria incidence and mosquito behaviors. The condensed data set is copied here. Ordinary regression (lm) shows that Incidence was negatively related to Mortality. This makes sense because the latter reflected the strength of killing mo...

...: (1) What is the total variance of the random effects at each level? (2) How can I test the significance of the variance components? (3) Is there something like an "r squared" for the whole model which I can state? The data come from an experiment on plant performance with and without insecticide, with and without grasses present, and across different levels of plant diversity ("div"). Thanks for your help! Christoph. lme(asin(sqrt(response)) ~ treatment + logb(div + 1, 2) + grass, random = ~ 1 | plotcode/treatment, na.action = na.exclude, method = "ML") Linear mixe...

...d.) See the discussion of substitution in the section on Quote and Quote-like Operators in the perlop manpage. The last few lines of the aborted help/InsectSprays is: ... Description: The counts of insects in agricultural experimental units treated with different insecticides. Usage: ------ stops here (but of course it shouldn't) --------- Any suggestions ? Thanks Ian -- Ian Thurlbeck http://www.stams.strath.ac.uk/ Statistics and Modelling Science, University of Strathclyde Livingstone Tower, 26 Richmond Street, Glasgow, UK, G1 1XH Tel: +44...

...: (1) What is the total variance of the random effects at each level? (2) How can I test the significance of the variance components? (3) Is there something like an "r squared" for the whole model which I can state? The data come from an experiment on plant performance with and without insecticide, with and without grasses present, and across different levels of plant diversity ("div"). Thanks for your help! Christoph. lme(asin(sqrt(response)) ~ treatment + logb(div + 1, 2) + grass, random = ~ 1 | plotcode/treatment, na.action = na.exclude, method = "ML") Linear mixe...