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4 results for “from:Ilona Leyer”

convergence error code in mixed effects models
Ilona Leyer · Dec 13, 2007 · r-help

Dear All, I want to analyse treatment effects with time series data: I measured e.g. leaf number (five replicate plants) in relation to two soil pH - after 2,4,6,8 weeks. I used mixed effects models, but some...

mixed-effects model with two fixed effects: interaction
Ilona Leyer · Jun 29, 2010 · r-help

Dear all, In a greenhouse experiment we tested performance of 4 different species (B,H,P,R) under 3 different water levels in 10 replications. As response variable e.g. the number of emerging sprouts were measured on three dates...

convergence error code in mixed effects models
Ilona Leyer · Dec 17, 2007 · r-help

Thank you for your helpful answer. The only thing obout what I still wonder is that some of the analyses work with R some time and some time not without any changes in the data or commands. Your text (from...

convergence error code in mixed effects models
Ilona Leyer · Dec 14, 2007 · r-help

Here an simple example: rep treat heightfra leaffra leafvim week ID1 pHf 1.54 4 4 4 ID2 pHf 1.49 4 4 4 ID3 pHf 1.57 4 5 4 ID4 pHf 1.48 4 4 4 ID5 pHf...

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