atr = ta.atr(60)
normalized_atr = (atr - ta.lowest(atr, 60)) / ((ta.highest(atr, 60)) - ta.lowest(atr, 60))
smoothed_normalized_atr = ta.wma(normalized_atr, 13)

WHERE ta.WMA uses the below calculation. PLEASE ONLY USE THIS CALCULATION FOR WMA

pine_wma(x, y) =>
    norm = 0.0
    sum = 0.0
    for i = 0 to y - 1
        weight = (y - i) * y
        norm := norm + weight
        sum := sum + x[i] * weight
    sum / norm