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Which of the following equations is used to estimate the trend term in the deterministic part of load?
N∑ddσσσ=1N+∑ddσσ=1N∑σσ=1NN∑σ2σ=1N+∑σσ=1N2
N∑ddσσσ=1N+∑ddσσ=1N∑σσ=1NN∑σ2σ=1N+∑σσ=1N2
N∑ddσσσ=1N-∑ddσσ=1N∑σσ=1NN∑σ2σ=1N-∑σσ=1N2
None of above