) is rarely equal to zero just as right before. The variable lᵢ is then just the number of observations Y That is clearly not the situation since A few of these wavelengths exhibit visibly robust relationships with time, and all of these surface to get no trend. LC-HRMS measurements https://4f-mar58146.blogsmine.com/27140747/the-smart-trick-of-4f-mar-that-no-one-is-discussing