How to resolve Non convergence problem in fitting Unstructured and Factor analytic variance-covariance model using ASREML-R?

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...

10 November 2019 634 4 View

How do I filter for genotype quality and depth using vcftools for sequence data?

I need to filter a vcf file for genotype quality and depth. How do I choose my filter parameter value? vcftools --gzvcf snps.txt.gz --quality ?? --depth ?? --recode --recode-INFO-all --out...

10 November 2018 3,165 0 View

Filter out genetic marker with Minor Allele Frequency?

A genotype data for Genome Wide Association Analysis (GWAS) is provided as 0, 1, and 2 format where individuals along the row and each column is a SNP. The minor allele frequency (MAF) is...

03 April 2018 9,562 3 View

What is appropriate statistic for correlation between ordinal and nominal variables?

04 May 2016 2,983 2 View

Correlation and PCA analysis on replicate or average value from RCBD?

04 May 2016 2,496 3 View

How can I calculate point density in interpolation grid?

A GSTAT library of R was used to generate a grid size of (i) 10 x 10 m and (ii) 10 x 5 m running from an Easting of 299677 m to 301297 m and a Northing of 5737278 m to 5738128 m. This resulted in...

10 November 2014 328 6 View

What to do when getting a warning message from a cross validation linear variogram model?

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...

03 April 2014 5,574 2 View

How can I obtain a standard error of variogram parameters estimate from a gstat package?

A number of variogram models were fitted where estimates like nugget, range, and sill were obtained from gstat of R. Could anyone guide me on how to obtain standard error for each of these...

03 April 2014 7,043 2 View

How do I figure out the parameter estimate of a matern and exponential variogram model?

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...

03 April 2014 7,319 3 View

What is the range of spatial dependency exponential variogram model?

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...

02 March 2014 130 7 View

How to compare two groups with only two measurements?

Hiiiii everyone! I have an enquiry on statistical analysis. I was looking for many forum and it's still cannot solve my problem. I want to compare means of two groups of data but only with two...

03 March 2021 8,796 3 View

What is your perception on using visual analysis or quantitative approaches to evaluate data from single-case research designs (n of 1 trials)?

Results of single-case research designs (i.e., n-of-1 trials) are often evaluated by visually inspecting the time-series graph and computing quantitative indices. A question our research team is...

03 March 2021 687 1 View

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10? Since, the growth curve from day 2 to 10 won't be like the "Logistic curve" it might not follow logistic...

03 March 2021 1,401 3 View

After a reference from Int J Body Compos Res, can any body help?

Hi, I am after the reference below, my library says it cannot obtain a copy either locally or internationally, any help appreciated! Chris Wang ZM, Heshka S, Wielopolski L, Pi-Sunyer FX, Pierson...

03 March 2021 6,193 1 View

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 View

What techniques can I use to determine the miscibility of polymer blends?

The term miscibility refers to the single-phase state in thermodynamics. I do not mean the compatibility of different components. To determine the miscibility I know several techniques such as...

03 March 2021 4,107 4 View

Resistor definition in Piezoelectric bimorph with ANSYS workbench

Hello, good day! I am trying to simulate similar bimorph piezoelectric harvester with below commands. However, the output power doesn't change with resistor value. Please help to find the reason. ET,10,CIRCU94,0 !SET UP RESISTOR R,1,100000 !RESISTANCE VALUE TYPE,10 !SET ELEMENT TYPE E,1,2 !CREATE RESISTOR BETWEEN NODES 1 AND 2 Thanks in advance Regards,

02 March 2021 0 0 View

What are the most reliable approaches to extract key continuous frames from a video, with complete automation?

I have an input video, of skin (from a microscope that means it is magnified such that blood capillaries are visible). The idea is to extract 15 sec of continuous frames from a video of 1 min,...

02 March 2021 2,735 2 View

How to normalise data on OPM package from R Studio ?

Good afternoon, I recently used OmniLog from BIOLOG for my experimentations : I tested the metabolism of different strains on 2 types of plates. I have 16 strains of 3 different groups...

02 March 2021 3,584 1 View

How to repeat an operation on an atom selection for multiple times in PyMol?

Hi, I am trying to construct a multi-layer fibril structure from a single layer in PyMol by translating the layer along the fibril axis. For now, I am able to use the Translate command in PyMol...

02 March 2021 4,569 4 View