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63 lines
2.5 KiB
63 lines
2.5 KiB
# frozen_string_literal: true
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class StudentResponseRateCalculator < ResponseRateCalculator
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def raw_response_rate
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rates_by_grade.values.length.positive? ? weighted_average : 0
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end
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def weighted_average
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num_possible_responses = 0.0
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rates_by_grade.keys.map do |grade|
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num_possible_responses += enrollment_by_grade[grade]
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end
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rates_by_grade.map do |grade, rate|
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rate * (enrollment_by_grade[grade] / num_possible_responses)
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end.sum
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end
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def rates_by_grade
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@rates_by_grade ||= enrollment_by_grade.map do |grade, num_of_students_in_grade|
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responses = survey_items_with_sufficient_responses(grade:)
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actual_response_count_for_grade = responses.values.sum.to_f
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count_of_survey_items_with_sufficient_responses = responses.count
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if actual_response_count_for_grade.nil? || count_of_survey_items_with_sufficient_responses.nil? || count_of_survey_items_with_sufficient_responses.zero? || num_of_students_in_grade.nil? || num_of_students_in_grade.zero?
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next nil
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end
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rate = actual_response_count_for_grade / count_of_survey_items_with_sufficient_responses / num_of_students_in_grade * 100
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[grade, rate]
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end.compact.to_h
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end
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def enrollment_by_grade
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@enrollment_by_grade ||= respondents.enrollment_by_grade
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end
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def survey_items_have_sufficient_responses?
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rates_by_grade.values.length.positive?
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end
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def survey_items_with_sufficient_responses(grade:)
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@survey_items_with_sufficient_responses ||= Hash.new do |memo, grade|
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threshold = 10
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quarter_of_grade = enrollment_by_grade[grade] / 4
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threshold = threshold > quarter_of_grade ? quarter_of_grade : threshold
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memo[grade] = SurveyItem.joins("inner join survey_item_responses on survey_item_responses.survey_item_id = survey_items.id")
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.student_survey_items
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.where("survey_item_responses.school": school, "survey_item_responses.academic_year": academic_year, "survey_item_responses.grade": grade, "survey_item_responses.survey_item_id": subcategory.survey_items.student_survey_items)
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.group("survey_items.id")
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.having("count(*) >= #{threshold}")
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.count
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end
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@survey_items_with_sufficient_responses[grade]
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end
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def total_possible_responses
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@total_possible_responses ||= begin
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return 0 unless respondents.present?
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respondents.total_students
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end
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end
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end
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