add ibd model

[priviere]

implement mixed model ? cf https://stat.ethz.ch/education/semesters/as2015/anova/09_Incomplete_Blocks.pdf pages 17 - 20

library(lme4)
m = lmer("variable ~ (1|germplasm) + block", data = d)

cf http://www.bodowinter.com/tutorial/bw_LME_tutorial2.pdf

if alpha design, look if agricolae does it cf #39

cf https://www.sciencedirect.com/science/article/pii/S0378429015001318

cf Alternative Experimental Designs for Plant Breeding. J Zystro, M Colley, J Dawson - Plant Breeding Reviews, 2018 - books.google.com https://scholar.google.fr/scholar?cluster=4242323211746910579&hl=fr&oi=scholaralrt&hist=JsVdCA4AAAAJ:14026937503540593349:AAGBfm0BRHq-cmaHqz10vFsJdQVrKfa4Cw -> implement all IBD method in the package ?!? Lots of work ! Is it useful ?

https://www.rdocumentation.org/packages/agricolae/versions/1.2-8/topics/PBIB.test

http://www.math.montana.edu/graduate/writing-projects/2012/12patchank.pdf

[priviere]

• do not forget to update design_experiment function
• look at alpha design instead of ibd : https://www.rdocumentation.org/packages/agricolae/versions/1.2-8/topics/design.alpha