from lib.irt.item_information_function import ItemInformationFunction class TestInformationFunction(): def __init__(self, irt_model): self.irt_model = irt_model self.iif = ItemInformationFunction(irt_model) # determins the amount of information # at a certain theta (ability level) of the sum of a question set correct # detailed further on page 166, equation 4 here: # https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5978482/pdf/10.1177_0146621615613308.pdf def calculate(self, items, **kwargs): sum = 0 for item in items: result = self.iif.calculate(b_param=item.b_param, theta=kwargs['theta']) sum += result return sum