Results 151 to 160 of about 55,007 (198)
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2013 Digital Heritage International Congress (DigitalHeritage), 2013
For the montage of large true to scale image plans the high quality of rectification of all single images is a major requirement. An automatic image processing with marker matching and rectification of IRT image stacks is now enabled with the help of newly developed optothermal markers.
Christoph Franzen +3 more
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For the montage of large true to scale image plans the high quality of rectification of all single images is a major requirement. An automatic image processing with marker matching and rectification of IRT image stacks is now enabled with the help of newly developed optothermal markers.
Christoph Franzen +3 more
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$β^{4}$-IRT: A New $β^{3}$-IRT with Enhanced Discrimination Estimation
CoRR, 2023Item response theory aims to estimate respondent's latent skills from their responses in tests composed of items with different levels of difficulty. Several models of item response theory have been proposed for different types of tasks, such as binary or probabilistic responses, response time, multiple responses, among others.
Manuel Ferreira Junior +4 more
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European Journal of Pediatrics, 2012
Cystic fibrosis (CF) is a life-threatening disease for which early diagnosis following newborn screening (NBS) improves the prognosis. We performed a prospective assessment of the immunoreactive trypsinogen (IRT)/DNA/IRT protocol currently in use nationwide, versus the IRT/pancreatitis-associated protein (PAP) and IRT/PAP/DNA CF NBS protocols.
Veronika, Krulišová +14 more
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Cystic fibrosis (CF) is a life-threatening disease for which early diagnosis following newborn screening (NBS) improves the prognosis. We performed a prospective assessment of the immunoreactive trypsinogen (IRT)/DNA/IRT protocol currently in use nationwide, versus the IRT/pancreatitis-associated protein (PAP) and IRT/PAP/DNA CF NBS protocols.
Veronika, Krulišová +14 more
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2019
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?? ???????????? ???????????????????? ???????????? ?????????????????????????? ?????????????? ?????????????????????????? ????????????????, ?????????????????? ???? ???????????????? ???????????????????? ?????????????????????????? ???????????? ?????? 800 ??????????????????????????????????????. ?????? ???????????????????? ???????? ?????????????????????? ?????
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Educational Measurement: Issues and Practice, 1991
The purpose of this instructional module is to provide the basis for understanding the process of score equating through the use of item response theory (IRT). A context is provided for addressing the merits of IRT equating methods. The mechanics of IRT equating and the need to place parameter estimates from separate calibration runs on the same scale ...
Linda L. Cook, Daniel R. Eignor
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The purpose of this instructional module is to provide the basis for understanding the process of score equating through the use of item response theory (IRT). A context is provided for addressing the merits of IRT equating methods. The mechanics of IRT equating and the need to place parameter estimates from separate calibration runs on the same scale ...
Linda L. Cook, Daniel R. Eignor
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Psychometrika, 2008
It is common practice in IRT to consider items as fixed and persons as random. Both, continuous and categorical person parameters are most often random variables, whereas for items only continuous parameters are used and they are commonly of the fixed type, although exceptions occur.
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It is common practice in IRT to consider items as fixed and persons as random. Both, continuous and categorical person parameters are most often random variables, whereas for items only continuous parameters are used and they are commonly of the fixed type, although exceptions occur.
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Some Neglected Problems in IRT
Psychometrika, 1995The paper addresses three neglected questions from IRT. In section 1, the properties of the “measurement” of ability or trait parameters and item difficulty parameters in the Rasch model are discussed. It is shown that the solution to this problem is rather complex and depends both on general assumptions about properties of the item response functions ...
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Approximations of Normal IRT Models for Change
Journal of Educational and Behavioral Statistics, 1999In this paper the one parameter Item Response Theory (IRT) model with normal Item Characteristic Curves (ICC) in longitudinal context has been studied. The abilities are structured according to a general mixed effects linear regression model. The items are supposed to be a sample from a large bank of items with constant mean difficulty.
Tan, E.S. +3 more
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Applications of Multilevel IRT Modeling
School Effectiveness and School Improvement, 2004The recent development of multilevel IRT models (Fox & Glas, 2001, 2003) has been shown to be very useful for analyzing relationships between observed variables on different levels containing measurement error. Model parameter estimates and their standard deviations are concurrently estimated taking account of measurement error in observed ...
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Infrared telescope in space: IRTS
Space Science Reviews, 1995The IRTS is a first Japanese infrared satellite mission which will be launched on February of 1995 by HII rocket. The IRTS is one of the mission experiments aboard the small space platform, SFU. The telescope aperture of the IRTS is 15cm, but is cooled by liquid Helium to realize very low background condition.
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