[R] Incomplete block design with random effects

Dear R Users, I am facing a problem analyzing an incomplete block design with two replicates. As you can see in the attached .xls file, the factor2 (6 levels) nested within factor1(two levels) nested within replicates all were chosen as random effects in the statistical model (see below). Note tha

[R] multi-regression with more than 50 independent variables

Hi R Users, I am going to run a multiple linear regression with around 57 independent variables. Each time I run the model with just 11 variables, the results are reasonable. With increasing the number of independent variables more than 11, the coefficients will get “NA” in the output. Is there a