search for: cultivars

Dear all R2.10 WinXP I have a dataset dealing with the way different wheat cultivars build their yield. Wheat ears are organised in spikelets where the spikelets can be numbered from the bottom, with even numbers on one side and odd on the other. I know how many kernels there were in each spikelet after some months spent counting them... Now I want to illustrate the differences be...

Dear all! W2k, R 2.5.1 I am working with an ongoing malting barley variety evaluation within Sweden. The structure is 25 cultivars tested each year at four sites, in field trials with three replicates and 'lattice' structure (the replicates are divided into five sub blocks in a structured way). As we are normally keeping around 15 varieties from each year to the next, and take in 10 new for next year, we have tested to...

...s may have tried to account for this (but if so, the terms are not laid out in a way that makes for ready interpretation. The design is such (two locations) that you do not have much of a check that effects are consistent over locations. You need to check whether results really are similar for all cultivars and for all herbicides, so that it is legitimate to pool as happens in the overall analysis. If a herbicide:cultivar combination has little effect the variability may be large, while if it has a dramatic effect (kills everything!), there may be no variability to speak of. John Maindonald. On 22 Fe...

This question will probably get me in trouble on theoretical grounds, but I will pose it anyway. The situation: I recently ran a field study looking for differences in sugarbeet cultivar tolerance to a specific herbicide. The study was set up so that 37 cultivars were treated with 4 different applications of the herbicide (37*4 factorial). In doing so, we found that the interaction effect was highly insignificant (ndf=108, ddf=144, F=0.28, p=1.0000). Now my problem is this... the study takes up an enormous amount of time, energy, and money (as you could g...

summary: how to make image.plot print a subtitle between the title and the image, rather than under the image? details: I've got a project https://github.com/TomRoche/ioapi-hack-R that illustrates the use of (et al) the R packages {ncdf4, fields, M3} for processing and visualizing IOAPI data. The data being visualized consists of a series of layers (mostly representing emissions from a

Dear all, W2k, R 2.5.1 I am trying out the AMMI function in the agricolae package, to analyse the dependence of environment for a certain cultivar. The function responds to four basic variables: ENV Environment GEN Genotype REP Replication Y Response My question concerns the 'REP' term. When I normally do an analysis of variance, the replication would refer to repeated observations

I've encountered something that didn't arise using earlier versions of R (Linux). A dataframe is created and new columns added to it by doing calculations using apply with various functions on some of the original columns. It's somewhat too involved to give a toy example that's reproducible. However, the resulting phenemonon can be characterised by the following: Browse[1]>

I have to compare four different grape varieties proteome in two different years. I don't know what test would be more suitable for my data. I think that an anova two way can be usefull also if someone suggested me to perform a manova. In addiction, I can perform each test on a single protein a time, but I can't loose my whole life carrying out anova (I have more than 1000 protein to

...only tangentially to R. The package announcement for hwriter points to a webpage created with the package, http://www.ebi.ac.uk/~gpau/hwriter/ based on the Fisher/Anderson iris data, including pictures. Unfortunately, the pictures are not of the right species (two appear to be tall bearded iris cultivars, the third probably either Iris ensata or Iris siberica). Pictures of the right species would be very useful -- Iris setosa really is visibly different in structure (not just in color), not having visible upright `standards'. There are nice pictures at the Iris Species Database: http://ww...

Dear useRs, I am working on a series of field experiments (159 in total) carried out in different years in several locations. The cultivars in each experiment are not always the same, in fact they change over time. I would like to get the fitted values and MSE of the individual fits from the following lmList object, so I can use them to fit a mixed model using the fitted values and weight each environment with (number of reps/MSE)/Av...

Dear R-expert, Is it possible to save graph from R into Latex document? I?can?see save as metafile , PNG, pdf etc, but I'm not sure which one to use. Thank ?you so much for your help.