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Use weighted average instead of simple average when calculating response rates

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This commit is contained in:
Gabe Farrell 2023-06-07 03:38:56 +00:00
parent 527aa66796
commit 37013c4b12
1 changed files with 18 additions and 4 deletions
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22
app/models/student_response_rate_calculator.rb
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@ -2,7 +2,17 @@
class StudentResponseRateCalculator < ResponseRateCalculator
def raw_response_rate
rates_by_grade.length.positive? ? rates_by_grade.average : 0
rates_by_grade.values.length.positive? ? weighted_average : 0
end
def weighted_average
num_possible_responses = 0.0
rates_by_grade.keys.map do |grade|
num_possible_responses += enrollment_by_grade[grade]
end
rates_by_grade.map do |grade, rate|
rate * (enrollment_by_grade[grade] / num_possible_responses)
end.sum
end
def rates_by_grade
@ -15,16 +25,20 @@ class StudentResponseRateCalculator < ResponseRateCalculator
next nil
end
cap_at_one_hundred(actual_response_count_for_grade / count_of_survey_items_with_sufficient_responses / num_of_students_in_grade * 100)
end.compact
[grade, actual_response_count_for_grade / count_of_survey_items_with_sufficient_responses / num_of_students_in_grade * 100]
end.compact.to_h
end
def enrollment_by_grade
@enrollment_by_grade ||= respondents.counts_by_grade
end
def total_enrollment
respondents.counts_by_grade.sum
end
def survey_items_have_sufficient_responses?
rates_by_grade.length.positive?
rates_by_grade.values.length.positive?
end
def survey_items_with_sufficient_responses(grade:)