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1. ### Why does the Root Mean Squared error formula seem incorrect?

Why does the RMS deviation formula seem incorrect? Shouldn't it equal, at least for positive numbers, the mean error? The formula for RMS is √∑((θ̂̂̂̈̂-θ)²) However, shouldn't it be ∑(√(θ̂̂̂̈̂-θ)²) ? i.e, that you should take the root of the squared individual estimates, and THEN sum them...
2. ### Converting linear regression estimates to percentages?

Hi all. Is there a method to convert two estimates that have been calculated using linear regression, to a percentage? eg, I have two X scores, two corresponding estimated Y scores, and a standard error of estimate. Is it valid to say a given X will score higher than another given X, a specified...
3. ### Why does the determinant always equal zero for a matrix of consecutive numbers?

Hi. Why does the determinant always equal zero for a matrix of consecutive numbers? This applies whether the consecutive numbers are in the matrix starting from smallest to largest, or vice versa. It also applies irrespective of whether they are entered row then column or vice versa, which...