Ahmed Sallam

17 Questions 36 Answers 0 Followers

Questions related from Ahmed Sallam

How can I estimate heritability from R?

How can I estimate heritability from R? I am using lm and aov thanks in advance

18 January 2016 3,696 3 View

Dose anybody know a software to analyze factorial design with two factors?

13 January 2016 1,381 14 View

What is the best way to detemine the LD decay?

25 February 2015 4,611 4 View

How can I calculate Area Under Symptom Progress?

I visually scored the symptoms of frost stress on leaves (loss of leaf turgidity and loss of leaf color). I would like to estimate AUSP.. I have 189 genotypes and they were evaluated under three...

13 January 2015 3,098 7 View

Is it statistically correct if I calculated the average of two replications to get a third replication?

if I have two replications, I can easily get a third replication by estimating the average of these two replications. I would like to ask; is this scientifically acceptable?. I mean is there a...

29 November 2014 8,033 5 View

Can I do an association analysis (using SNP) for agronomic traits sown in one location with two replications only?

I tested 189 faba bean lines in field with two replications in one year and assessed a number of traits. These lines were genotyped using SNPs (156). Do you think that I can do association...

20 November 2014 6,643 11 View

What are the next steps after conducting assciation mapping?

After getting many QTLs using the AM approach, what are the next steps?

18 April 2014 3,538 2 View

Does the PCoA of the genetic distance differ much from the PCoA of the genetic similarity?

I have analyzed my population (186 lines) using principal coordinate analysis of genetic distance and genetic similarity. As a result, I have got two very different plots. Using genetic distance,...

25 February 2014 4,278 1 View

How Can I determine the number of markers required for Genome Wide Association analysis through LD decay?

17 February 2014 7,568 2 View

What is the minimum of linkage disequilibrium between markers in the population?

09 February 2014 379 3 View

What does the warning message "1: In is.euclid(d) : Zero distance(s)" mean?

** Package ade4, command dist.binary I would like to estimate the genetic distance using simple matching approach "Simple matching coefficient of Sokal & Michener (1958)" My file name is snp and...

02 February 2014 10,261 3 View

What is the relationship between linkage disequilibrium and population structure?

I have a population that consists of 187 lines. I genotyped them using 156 SNPs. This population was derived from crossing between 11 parents (from different regions). The 187 are highly...

27 January 2014 8,660 6 View

What is the relation between association analysis and analysis of population structure (Using STRUCTURE software)?

I have a population that consists of 187 lines. I genotyped them using 156 SNPs. This population were derived from crossing between 11 parents (from different regions). The 187 are highly...

20 January 2014 9,878 1 View

What is the difference between chilling and frost? do they have the same meaning?

Frost resistance

19 January 2014 6,458 5 View

What is the LD between pair of marker in the output file of LD in TASSEL 3.0, r2 (red square) or Dprime (black square)

The output of LD analysis of 155 SNPs is many columns and I do not know which is the LD between pair of markers. is it r2 or Dprime? Kindly find the attachment

15 December 2013 2,932 0 View

Do you have any idea about a software that may calculate distance (in cM) between each pair of markers?

I have 155 SNP markers, and I would like to calculate distance in cM between each pair of markers.

22 November 2013 2,099 7 View

What software to use for calculating distance between makers (Mb)?

Can anyone suggest me a software to calculate distance between makers (Mb)? I have 155 SNPs.

15 November 2013 2,642 3 View