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linking white paper and lower case irt model selection

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This commit is contained in:
brmnjsh 2023-10-26 15:09:58 +00:00
parent 433879c205
commit 2984f18f9f
4 changed files with 6 additions and 3 deletions
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2
app/lib/irt/item_information_function.py
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@ -21,7 +21,7 @@ class ItemInformationFunction():
return (self.model_data.a_param * q * return (self.model_data.a_param * q *
(p - self.model_data.c_param)**2) / (p * ( (p - self.model_data.c_param)**2) / (p * (
(1 - self.model_data.c_param)**2)) (1 - self.model_data.c_param)**2))
elif self.model_data.model == 'RASCH': elif self.model_data.model == 'rasch':
p = Rasch(self.model_data, kwargs).result() p = Rasch(self.model_data, kwargs).result()
q = 1 - p q = 1 - p
return p * q return p * q

2
app/lib/irt/item_response_function.py
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@ -11,7 +11,7 @@ class ItemResponseFunction():
def calculate(self, **kwargs): def calculate(self, **kwargs):
if self.model_data.model == '3PL': if self.model_data.model == '3PL':
return ThreeParameterLogistic(self.model_data, kwargs).result() return ThreeParameterLogistic(self.model_data, kwargs).result()
elif self.model_data.model == 'RASCH': elif self.model_data.model == 'rasch':
return Rasch(self.model_data, kwargs).result() return Rasch(self.model_data, kwargs).result()
else: else:
raise ItemGenerationError("irt model not supported or provided") raise ItemGenerationError("irt model not supported or provided")

3
app/lib/irt/models/rasch.py
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@ -5,6 +5,9 @@ from lib.irt.models.base import *
class Rasch(Base): class Rasch(Base):
def result(self): def result(self):
# contains the primary Rasch function, determining the probably of an inidividual
# that an individual at a certain theta would get a particular question correct
# https://edres.org/irt/baker/chapter6.pdf
return (1 / (1 + self.e(-1 * (self.theta - self.b_param)))) return (1 / (1 + self.e(-1 * (self.theta - self.b_param))))
@classmethod @classmethod

2
app/services/form_generation_service.py
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@ -1,6 +1,6 @@
import json, random, io, logging import json, random, io, logging
from pulp import LpProblem, LpVariable, LpMinimize, LpMaximize, LpAffineExpression, LpConstraint, LpStatus, lpSum from pulp import LpProblem, LpVariable, LpMinimize, LpStatus, lpSum
from lib.application_configs import ApplicationConfigs from lib.application_configs import ApplicationConfigs
from helpers import aws_helper, tar_helper, csv_helper, service_helper, solver_helper from helpers import aws_helper, tar_helper, csv_helper, service_helper, solver_helper