This algorithm is weighted towards non-zero values and numbers in the series that are changing. A value of zero and numbers in sequence that are the same value, are given less weight in the calculation. The algorithm will be a summing of result
- This algorithm, will expect a list of numbers... whole numbers and/or decimals.
- if the supplied list is empty , then the trend calculator should return a value of zero (0).
- if the list contains only a single value, then the trend calculator should return a value of zero (0).
- the resulting trend will always start with a value of zero (0).
- the first pair will contain the first two numbers in the list
- the second pair will contain the second and third number in the list (and so on, until the list is completely processed).
- the final pair, will be the last two numbers in the list.
- the order of the list will be determined by the original order passed to the calculator. No additional sorting will be required.
- The following calculation will be applied to each pair. Pairs will be denoted as [p1, p2]
if p1 equals zero and p2 > 0, the value for the pair will be 1.0
if p1 equals p2, the value for the pair will be 0.0
otherwise, the value for the pair will be (p2-p1)/p1.
The result of each pair calculation will be summed, returning the trend value.
Available in Hex, the package can be installed
by adding trend_utils to your list of dependencies in mix.exs:
def deps do
[
{:trend_utils, "~> 0.1.0"}
]
end