Mohammad Tahir

10 Questions 70 Answers 0 Followers

Questions related from Mohammad Tahir

Can we combine several locations that have significant differences?

In multi-environment experiments we combine only those locations which show non-significant interactions with the treatments (varieties/genotypes). Could we combine those displaying significant...

11 November 2013 8,085 2 View

I don't get signifcant results from my ANOVA for treatments while in fact there are.

I have some 1000 treatments in augmented design. However, when I run F test for differences among treatments, it is not significant. Pie chart of the treatments according to frequencies of...

05 May 2013 1,937 8 View

How to perform multi trait BLUP using SAS proc Mixed?

I have some 1500 sugarcane genotypes and want calculate breeding values using multi trait BLUP technique. Any Clue for the procedure?

04 April 2013 4,848 0 View

What is robust discussion?

Many of the journal reviewers desire a robust discussion and conclusion in research articles. What exactly should be included/excluded to make them robust?

03 March 2013 2,218 0 View

AMOS 18 returns only direct effects of the variables and not the indirect effects.

I ran path analysis using AMOS 18. It give me direct effect of all variables but shows indirect effects to be zero. What could be the reason?

03 March 2013 2,793 2 View

What is the difference between Smith's selection indices and BLUP indices?

Both use simultaneous selection for traits for improved genetic advance. What is the main difference and which one should be used?

02 February 2013 9,914 0 View

What kind of transformation to apply to variables having multicollinearity?

After multicollinearity is detected, remedial measures include removing the problem variable(s) and transforming the variable to reduce mutlicollinearity. What kind of transformation can we apply...

02 February 2013 2,053 21 View

Error when using correlations as inputs in AMOS 20 for path analysis.

I have 11 variables with X11 as the dependent (endogenous) variable. The remaining are causal variables in three groups. I draw the path diagram and connect the data that have correlations for the...

02 February 2013 8,974 19 View

My data has the problem of multicolinearity. Removing unique variables using variance inflation factor (VIF) didn't work? Any solution?

I estimated genotypic correlations and then the path coefficients which gave very strange direct effects (more than 3) and residual (-2.2). I used SAS Proc Reg with the VIF option to remove any...

01 January 2013 5,165 16 View

Do we have to transform data when bartlett test fails?

What kind of transformation would be needed?

11 November 2012 3,916 1 View