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Seminars in Cell and Developmental Biology, 1999 The DIFs are a family of secreted chlorinated molecules that control cell fate during development ofDictyostelium cells in culture and probably during normal development too. They induce stalk cell differentiation and suppress spore cell formation.
Robert R Kay, Christopher R L Thompson
exaly +4 more sources
A Multidimensionality-Based DIF Analysis Paradigm
Applied Psychological Measurement, 1996 A multidimensionality-based differential item functioning (DIF) analysis paradigm is presented that unifies the substantive and statistical DIF analysis approaches by linking both to a theoretically sound and mathematically rigorous multidimensional ...
Louis Roussos, William Stout
exaly +2 more sources
The dif/Xer recombination systems in proteobacteria.
PLoS ONE, 2009 In E. coli, 10 to 15% of growing bacteria produce dimeric chromosomes during DNA replication. These dimers are resolved by XerC and XerD, two tyrosine recombinases that target the 28-nucleotide motif (dif) associated with the chromosome's replication ...
Carnoy Christophe +3 more
core +6 more sources
Models dif-in-dif en dades telemàtiques d'accidents d'automòbil [PDF]
El projecte analitza com canvia el comportament d’una persona després d’haver tingut un accident de trànsit mitjançant la tècnica economètrica Dif-in-Dif (Difference-in-Difference). Concretament es comparen els canvis abans i després de l’accident en dos
Orteu i Irurre, Anna-Patrícia
core +3 more sources
Dif-in-Dif Estimators of Multiplicative Treatment Effects [PDF]
Journal of Econometric Methods, 2014 Abstract We consider a difference-in-differences setting with a continuous outcome. The standard practice is to take its logarithm and then interpret the results as an approximation of the multiplicative treatment effect on the original outcome.
Ciani, E, Fisher, P
openaire +6 more sources
Anchor selection strategies for DIF analysis: Review, assessment, and new approaches [PDF]
, 2013 Differential item functioning (DIF) indicates the violation of the invariance assumption for instance in models based on item response theory (IRT). For item-wise DIF analysis using IRT, a common metric for the item parameters of the groups that are to ...
Zeileis, Achim +2 more
core +1 more source
Anchor methods for DIF detection: A comparison of the iterative forward, backward, constant and all-other anchor class [PDF]
, 2013 In the analysis of differential item functioning (DIF) using item response theory (IRT), a common metric is necessary to compare item parameters between groups of test-takers.
Zeileis, Achim +2 more
core +1 more source
Detecting Differential Item and Step Functioning with Rating Scale and Partial Credit Trees [PDF]
, 2014 Several statistical procedures have been suggested for detecting differential item functioning (DIF) and differential step functioning (DSF) in polytomous items.
Zeileis, Achim +2 more
core +1 more source
A new method for detecting differential item functioning in the Rasch model [PDF]
, 2010 Differential item functioning (DIF) can lead to an unfair advantage or disadvantage for certain subgroups in educational and psychological testing. Therefore, a variety of statistical methods has been suggested for detecting DIF in the Rasch model.
Zeileis, Achim +2 more
core +1 more source
A Penalty Approach to Differential Item Functioning in Rasch Models [PDF]
, 2012 A new diagnostic tool for the identification of differential item functioning (DIF) is proposed. Classical approaches to DIF allow to consider only few subpopulations like ethnic groups when investigating if the solution of items depends on the ...
Tutz, Gerhard, Schauberger, Gunther
core +1 more source