1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
# frozen_string_literal: true
module DDMetrics
class Stats
class EmptyError < StandardError
def message
'Not enough data to perform calculation'
end
end
def initialize(values)
@values = values
end
def inspect
"<#{self.class} count=#{count}>"
end
def count
@values.size
end
def sum
raise EmptyError if @values.empty?
@values.reduce(:+)
end
def avg
sum.to_f / count
end
def min
quantile(0.0)
end
def max
quantile(1.0)
end
def quantile(fraction)
raise EmptyError if @values.empty?
target = (@values.size - 1) * fraction.to_f
interp = target % 1.0
sorted_values[target.floor] * (1.0 - interp) + sorted_values[target.ceil] * interp
end
private
def sorted_values
@sorted_values ||= @values.sort
end
end
end
|
