What is the difference between 'k' and 'Z'

Question

[kkp5232]

Hello,

I am new with GWAS. Right now I try to get the estimations of the relationship between two subjects. I have looked online and online said 'k0', 'k1', and 'k2'. Also I have run the program and I have 'Z0', 'Z1', and 'Z2' instead 'k0', 'k1', and 'k2'. I try to understand what is the difference between them. I am still confused. Are they same thing? Can anyone explain, please?

Thank you very much for your help!

UPDATE: Is the question clear? If not, please let me know.

[russhh]

Sorry, the question really isn't clear at all. Which of plinks many functions are you using? What did you expect to see in the output? Could you give a reference for your 'k1' et al, so that we might have a wee bit of context

[kkp5232]

Thank you very much for response! I was worrying that my question is not clear.

I used PLINK command line: plink --file plink --genome

In plink.genome, I have 'Z0','Z1','Z2', and 'PI_HAT'

I just want to understand how did the statistic works for 'Z0', 'Z1', 'Z2', and 'PI_HAT'. So I researched online.. So I found few websites like this:

http://genome-lab.ucdavis.edu/Links/ECL%20290%20Winter%202007/week%209/K_coefficients.pdf - see k0, k1, k2 in the table?

http://mga.bionet.nsc.ru/~yurii/courses/ge03-2013/_confounding.pdf - more 'k' in this website as well.

So what is the different between 'k' and 'z'? or are they same thing?