Statistical methodology has been developed to decompose total variance into sources of variation. These sources of variation are usually referred to as components of variance. There are different reasons for attempting to produce variance components. In models decomposing the variance is often done in order to increase the accuracy of the model. In the finite population setting, variance is usu...

a study was conducted to investigate the genetic variance components and the combinig ability of sunflowers lines at the seed and plant improvement institute, karaj, iran in 2006. a total of 41 genotypes including 2 cms, 13 restorer and their 26 corresponding hybrids were evaluated in a line × tester approach. the analysis of variance indicated that significant differences existed among genotyp...