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Questions related from Moshood Bakare
The selection accuracy in genomic selection (GS) is often calculated as correlation between true genetic value and estimated breeding value. Is it possible to have negative values as selection...
14 November 2022 6,665 2 View
I am trying to estimate founder and effective population size from sequence marker data using NeEstimator software. The sequence data is already in HapMap format which needs to be converted to...
13 March 2020 2,063 3 View
Dear All, I am using ASREML-R to fit unstructured (UN) and factor analytic (FA) model to explore complex structure of genotype by environment interaction in multienvironment yield data. There are...
14 November 2019 6,357 4 View
The likelihood ratio test of comparing reduced model with full model differs by fixed factor result to chi-square distribution of zero degree of freedom. /* reduced model */ proc mixed method =...
29 March 2018 8,154 4 View
I am trying to identify outliers by plotting conditionally externally studentized residual against predicted values obtained from fitting mixed model in SAS using PROC MIXED as follows: proc mixed...
29 March 2018 3,789 2 View
I have intention to group cultivars of a root crop into various heterotic groups. Could this be achieved through the analysis of combined historical data in the breeding program? Or do I need to...
20 December 2017 4,075 3 View
Assuming 12 varieties are evaluated in 4 replicates in Randomized Complete Block Design (RCBD) where 20 variables are measured, is it appropriate to run correlation and principal component...
19 May 2016 9,846 3 View
These statistics measures association between ordinal variables: gamma, Kendall’s tau-, Stuart’s tau-, and Somers’. If I am to report correlation between ordinal and nominal variables, what is...
04 May 2016 4,713 2 View
The 15 farms have new treatments in common but the local variety which is considered to be a check variety varies from one farm to another. There was NO replication of each treatment within a...
04 April 2016 5,520 1 View
In plant breeding, we often talk of estimate of random effect i.e. BLUP and variance component on quantitative variables such as yield, plant height and etc. My thought is that estimate of BLUP or...
04 April 2016 4,698 3 View
I intend to obtain kinship matrix from pedigree data through proc inbreed to be used as input to proc mixed in order to obtain additive genetic variance. The warning message is always "Individual...
01 April 2016 6,663 3 View
Could anyone help me with SAS script for line x tester analysis in crop breeding?
27 November 2015 9,469 7 View
Dear All,The attached file showed the prediction and variance map from ordinary kriging interpolation method of one of my yield data sets. The yield data was standardized to mean of 0 and standard...
24 September 2014 934 4 View
Hi, 4-year yield monitor data from a field has a practical range of 39.6, 99.6, 47.7, and 59.4 meters in year 2008, 2009, 2010, and 2011 respectively. Their spatial pattern is best described with...
11 September 2014 3,858 10 View
A set of interpolated values were obtained through ordinary kriging and inverse distance weighting method using gstat library of R. Could anyone guide me on how to cross validate these...
15 May 2014 3,089 7 View
I used gstat to fit a Matern variogram model to my crop yield by setting the kappa = 0.5. To my surprise, its parameter estimates are exactly the same with that of exponential. Does it mean that...
09 April 2014 5,912 2 View
The four variogram models below are fitted to the same dataset. I got a warning message while cross validating a fitted linear variogram model as Warning message: In sqrt(ret[[var.name]]) : NaNs...
07 April 2014 1,684 3 View
Assess goodness of fit variogram model.
05 April 2014 6,747 2 View
Having fitted common variogram models using gstat of R, I intend to identify the optimal model by using sum of squares errors (SSerr), mean error (ME) and mean square deviation ratio (MSDR) of...
02 April 2014 4,441 20 View
An exponential model is fitted to empirical semivariogram using gstat of R package. The variogram parameters obtained is model psill range 1 Nug 0.04281109 0.00000 2 Exp 0.76810071...
27 March 2014 5,563 6 View
I am surprised to get different results for skewness and kurtosis from different application or library. Take for example, with moments library package in R we have the following...
11 March 2014 1,842 13 View
I am using R version of 2.15.3 in R studio environment. I used a function "skew" but got an error message that the name function cannot be found.
07 March 2014 1,702 12 View
I tried to compare the result obtained by fitting the spherical variogram model using fit.variogram and nls functions. The large difference in the results is a great concern for me knowing that...
03 September 2013 4,433 1 View
Dear All, I intend to fit spatial covariance structure model to geostatistical data with yield as attribute component and longitude and latitude as spatial component. I plotted the point locations...
02 July 2013 9,240 3 View
