select topic: subjects were continuously extracted and the ability to adapt to the topic of computer-aided testing of the basic principles of CAT, the largest general use of the information function in IRT exam topics, the so-called information function is that the subject parameters and by ability to measure the relationship between those functions,
mac cosmetics wholesale, which subject's ability to estimate. Termination conditions: first, a precision index intended to estimate the ability to achieve the desired accuracy factor for the termination condition, that is, when the subject's ability to estimate gradually stabilized, they can end the test. This method has the advantage of the amount of information can be additive, a set of questions can be applied at any time estimate the amount of information measured the sum of the different abilities of the subjects were, the subject has a different amount of information,
tory burch outlet, according to the ability to guess the value of the front, through the CAT system Search the largest amount of information the subject of the appropriate test, CAT exam also has the advantage of comparability, the final score can be converted to the amount of comparable scale. 3 Theoretical arguments based on examination of computer-based course evaluation system of quality papers on the IRT made paper reaction test points are: the difficulty of differentiation, reliability, validity, and adaptive assessment of student ability, highlight the paper quality evaluation system: J1: computer-based content in the ability to test the proportion of candidates: large,
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ghd planchas, narrow and too wide. J3: answers to normative standards, rigor, and operability, whether the titles and detailed written answer, the answer is correct not to clear any reasonable points, excellent, good, fair, poor
test the students were to be elected with high levels of problems, low levels of problems on election easily, from the bank building to the topics and score are IRT theory as a guide. IRT line with the theory exam, that is, to satisfy certain conditions of the subjects have to build the main parameters and characteristics of the probability of correct answers was tested with the ability to model the relationship between. Parameters include the power of discrimination, difficulty and guessing factor. Maximum likelihood estimation method is widely used in modern testing methods. Specific points are based on the learning ability of students to be tested to estimate, then the ability to select appropriate values corresponding to the maximum value of the items of information, the following steps: (1) the establishment of Q; (2) initialization parameters, namely, the ability of candidates initial estimate; (3) ability to estimate the L (UJ / θ) that ability is θ, the response of the subject J to UJ, if the answer UJ = 1, the probability of wrong answer UJ = 0. Likelihood functional: L (U1, U2, ... Un) = ni = 1! Pi · Qi which: U1, U2 ... response vector, n: number of subjects; Pi candidates to answer the first question i probability; Qi candidates got it wrong the probability of the i-th problem. Response vector for each Ui to the corresponding value of θ, so that the maximum likelihood function value. Newton-Raphson method using successive iterations of the formula, the ability of the candidates obtained maximum likelihood estimates θt +1 = θt + f '(θ) / f = Dni = 1 of which: θt +1, θt for the first t +1, t iterations of the ability estimates; D = 1.702; i title number; ai i-th problem differentiation; bi difficulty; ci guess factor; pi is Candidates answer questions measuring the probability of the i; qi i got the wrong answer the first question of probability, Ui vector of the subject's response (correct answer is 1, got the wrong answer as 0).
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