Search results for: K Dijkstra

Items from 1 to 20 out of 35 results

article

Classroom Popularity Hierarchy Predicts Prosocial and Aggressive Popularity Norms Across the School Year

Lydia Laninga‐Wijnen, Zeena Harakeh, Claire F. Garandeau, Jan K. Dijkstra, more

Child Development > 90 > 5 > e637 - e653

This study examined the coevolution of prosocial and aggressive popularity norms with popularity hierarchy (asymmetries in students’ popularity). Cross‐lagged‐panel analyses were conducted on 2,843 secondary school students (N_classrooms = 120; M_age = 13.18; 51.3% girls). Popularity hierarchy predicted relative change in popularity norms over time, but not vice versa. Specifically, classrooms with...

article

Adolescents’ Friendships, Academic Achievement, and Risk Behaviors: Same‐Behavior and Cross‐Behavior Selection and Influence Processes

Mariola C. Gremmen, Christian Berger, Allison M. Ryan, Christian E.G. Steglich, more

Child Development > 90 > 2 > e192 - e211

This study examined to what extent adolescents’ and their friends’ risk behaviors (i.e., delinquency and alcohol use) hinder or promote their academic achievement (grade point average [GPA]), and vice versa. Longitudinal data were used (N = 1,219 seventh‐ to ninth‐grade adolescents; M_age = 13.69). Results showed that risk behaviors negatively affected adolescents’ GPA, whereas GPA protected against...

article

Feasibility of an alternative, physiologic, individualized open-lung approach to high-frequency oscillatory ventilation in children

Pauline Jager, Tamara Kamp, Sandra K. Dijkstra, Johannes G. M. Burgerhof, more

Annals of Intensive Care > 2019 > 9 > 1 > 1-13

Background High-frequency oscillatory ventilation (HFOV) is a common but unproven management strategy in paediatric critical care. Oscillator settings have been traditionally guided by patient age and/or weight rather than by lung mechanics, thereby potentially negating any beneficial effects. We have adopted an open-lung HFOV strategy based on a corner frequency approach using an initial incremental–decremental...

article

Hyperspectral demosaicking and crosstalk correction using deep learning

K. Dijkstra, J. Loosdrecht, L. R. B. Schomaker, M. A. Wiering

Machine Vision and Applications > 2019 > 30 > 1 > 1-21

Precision agriculture using unmanned aerial vehicles (UAVs) is gaining popularity. These UAVs provide a unique aerial perspective suitable for inspecting agricultural fields. With the use of hyperspectral cameras, complex inspection tasks are being automated. Payload constraints of UAVs require low weight and small hyperspectral cameras; however, such cameras with a multispectral color filter array...

article

Management of drug interactions with direct‐acting antivirals in Dutch HIV/hepatitis C virus‐coinfected patients: adequate but not perfect

EJ Smolders, C Smit, CTMM Kanter, ASM Dofferhoff, more

HIV Medicine > 19 > 3 > 216 - 226

Objectives Direct‐acting antivirals (DAAs) for treatment of chronic hepatitis C virus (HCV) infection can cause drug–drug interactions (DDIs) with combination antiretroviral therapy (cART) and non‐cART co‐medication. We mapped how physicians manage DDIs between DAAs and co‐medication and analysed treatment outcomes. Methods Data were prospectively collected as part of the ATHENA HIV observational...

article

Tumor Organoids as a Pre-clinical Cancer Model for Drug Discovery

Fleur Weeber, Salo N. Ooft, Krijn K. Dijkstra, Emile E. Voest

Cell Chemical Biology > 2017 > 24 > 9 > 1092-1100

Tumor organoids are 3D cultures of cancer cells that can be derived on an individual patient basis with a high success rate. This creates opportunities to build large biobanks with relevant patient material that can be used to perform drug screens and facilitate drug development. The high take rate will also allow side-by-side comparison to evaluate the translational potential of this model system...

article

The Norms of Popular Peers Moderate Friendship Dynamics of Adolescent Aggression

Lydia Laninga‐Wijnen, Zeena Harakeh, Christian Steglich, Jan K. Dijkstra, more

Child Development > 88 > 4 > 1265 - 1283

This study examined whether peer norms for aggression within the classroom impact friendship selection, maintenance, and socialization processes related to aggression across the 1st year of secondary school (N = 1,134 students from 51 classes, M_age = 12.66). As hypothesized, longitudinal social network analyses indicated that friendship selection and influence processes related to aggression depended...

article

Short-term effects of neuromuscular blockade on global and regional lung mechanics, oxygenation and ventilation in pediatric acute hypoxemic respiratory failure

Marlon E. F. Wilsterman, Pauline Jager, Robert Blokpoel, Inez Frerichs, more

Annals of Intensive Care > 2016 > 6 > 1 > 1-11

Background Neuromuscular blockade (NMB) has been shown to improve outcome in acute respiratory distress syndrome (ARDS) in adults, challenging maintaining spontaneous breathing when there is severe lung injury. We tested in a prospective physiological study the hypothesis that continuous administration of NMB agents in mechanically ventilated children with severe acute hypoxemic respiratory failure...

article

Implicit emotion regulation while viewing fictive and real pictures: event related potential evidence in response to affective pictures

N. Van Dongen, J.W. Van Strien, K. Dijkstra

European Neuropsychopharmacology > 2016 > 26 > S2 > S306

article

Partial least squares path modeling using ordinal categorical indicators

Florian Schuberth, Jörg Henseler, Theo K. Dijkstra

Quality & Quantity > 2018 > 52 > 1 > 9-35

This article introduces a new consistent variance-based estimator called ordinal consistent partial least squares (OrdPLSc). OrdPLSc completes the family of variance-based estimators consisting of PLS, PLSc, and OrdPLS and permits to estimate structural equation models of composites and common factors if some or all indicators are measured on an ordinal categorical scale. A Monte Carlo simulation...

article

Resurfacing of damaged articular cartilage surfaces using arthroscopic airbrushing

J. Hendriks, C. Visser, K. Dijkstra, L. Vonk, more

Osteoarthritis and Cartilage > 2016 > 24 > S1 > S465

chapter

Evasion of G1 Checkpoints in Cancer

Krijn K. Dijkstra, Cristophe Blanchetot, Johannes Boonstra

Macromolecular Anticancer Therapeutics > Checkpoint Controls and Targets in Cancer Therapy > Circuitry of Checkpoint Response > 3-26

A cell progressing through the cell cycle encounters various checkpoints in G1 that can lead to an exit from the cell cycle. This ensures that cells only proliferate when destined to do so. Cancer, however, is characterized by uncontrolled proliferation and cancer cells thus bypass these checkpoints. In this chapter, the various G1 checkpoints will be scrutinized with an emphasis on how alterations...

chapter

Latent Variables and Indices: Herman Wold’s Basic Design and Partial Least Squares

Theo K. Dijkstra

Springer Handbooks of Computational Statistics > Handbook of Partial Least Squares > Methods > 23-46

In this chapter it is shown that the PLS-algorithms typically converge if the covariance matrix of the indicators satisfies (approximately) the “basic design”, a factor analysis type of model. The algorithms produce solutions to fixed point equations; the solutions are smooth functions of the sample covariance matrix of the indicators. If the latter matrix is asymptotically normal, the PLS-estimators...

article

Cartilage regeneration and intermittent hydrostatic pressure: A role for MSCs

K. Dijkstra, S.C. Mastbergen, H.B. Karperien, F.P. Lafeber

Osteoarthritis and Cartilage > 2015 > 23 > Supplement 2 > A366

article

Pitchfork–Hopf bifurcations in 1D neural field models with transmission delays

K. Dijkstra, S.A. van Gils, S.G. Janssens, Yu.A. Kuznetsov, more

Physica D: Nonlinear Phenomena > 2015 > 297 > Complete > 88-101

Recently, local bifurcation theory for delayed neural fields was developed. In this paper, we show how symmetry arguments and residue calculus can be used to simplify the computation of the spectrum in special cases and the evaluation of the normal form coefficients, respectively. This is done hand in hand with an extensive study of two pitchfork–Hopf bifurcations for a 1D neural field model with...

article

Consistent and asymptotically normal PLS estimators for linear structural equations

Theo K. Dijkstra, Jörg Henseler

Computational Statistics and Data Analysis > 2015 > 81 > Complete > 10-23

A vital extension to partial least squares (PLS) path modeling is introduced: consistency. While maintaining all the strengths of PLS, the consistent version provides two key improvements. Path coefficients, parameters of simultaneous equations, construct correlations, and indicator loadings are estimated consistently. The global goodness-of-fit of the structural model can also now be assessed, which...

article

PLS' Janus Face – Response to Professor Rigdon's ‘Rethinking Partial Least Squares Modeling: In Praise of Simple Methods’

Theo K. Dijkstra

Long Range Planning > 2014 > 47 > 3 > 146-153

I respond to two of the theses put forward by Professor Rigdon: 1. PLS should sever every tie with factor modeling, and 2. The fundamental problem of factor indeterminacy makes factor-based methods fundamentally unsuited to prediction-oriented research. With respect to the first thesis my response is that adherence to its advice would waste a potentially very useful method: there is a version of PLS...

article

TH17 differentiation capacity develops within the first 3 months of life

Krijn K. Dijkstra, Sanne B.E.A. Hoeks, Berent J. Prakken, Sytze de Roock

The Journal of Allergy and Clinical Immunology > 2014 > 133 > 3 > 891-894.e5

article

Ridge regression and its degrees of freedom

Theo K. Dijkstra

Quality & Quantity > 2014 > 48 > 6 > 3185-3193

For ridge regression the degrees of freedom are commonly calculated by the trace of the matrix that transforms the vector of observations on the dependent variable into the ridge regression estimate of its expected value. For a fixed ridge parameter this is unobjectionable. When the ridge parameter is optimized on the same data, by minimization of the generalized cross validation criterion or Mallows...

article

Consistent Partial Least Squares for Nonlinear Structural Equation Models

Theo K. Dijkstra, Karin Schermelleh-Engel

Psychometrika > 2014 > 79 > 4 > 585-604

Partial Least Squares as applied to models with latent variables, measured indirectly by indicators, is well-known to be inconsistent. The linear compounds of indicators that PLS substitutes for the latent variables do not obey the equations that the latter satisfy. We propose simple, non-iterative corrections leading to consistent and asymptotically normal (CAN)-estimators for the loadings and for...

Publication date

Set your own date range

INFONA - science communication portal

Search results for: K Dijkstra

Classroom Popularity Hierarchy Predicts Prosocial and Aggressive Popularity Norms Across the School Year

Adolescents’ Friendships, Academic Achievement, and Risk Behaviors: Same‐Behavior and Cross‐Behavior Selection and Influence Processes

Feasibility of an alternative, physiologic, individualized open-lung approach to high-frequency oscillatory ventilation in children

Hyperspectral demosaicking and crosstalk correction using deep learning

Management of drug interactions with direct‐acting antivirals in Dutch HIV/hepatitis C virus‐coinfected patients: adequate but not perfect

Tumor Organoids as a Pre-clinical Cancer Model for Drug Discovery

The Norms of Popular Peers Moderate Friendship Dynamics of Adolescent Aggression

Short-term effects of neuromuscular blockade on global and regional lung mechanics, oxygenation and ventilation in pediatric acute hypoxemic respiratory failure

Implicit emotion regulation while viewing fictive and real pictures: event related potential evidence in response to affective pictures

Partial least squares path modeling using ordinal categorical indicators

Resurfacing of damaged articular cartilage surfaces using arthroscopic airbrushing

Evasion of G1 Checkpoints in Cancer

Latent Variables and Indices: Herman Wold’s Basic Design and Partial Least Squares

Cartilage regeneration and intermittent hydrostatic pressure: A role for MSCs

Pitchfork–Hopf bifurcations in 1D neural field models with transmission delays

Consistent and asymptotically normal PLS estimators for linear structural equations

PLS' Janus Face – Response to Professor Rigdon's ‘Rethinking Partial Least Squares Modeling: In Praise of Simple Methods’

TH17 differentiation capacity develops within the first 3 months of life

Ridge regression and its degrees of freedom

Consistent Partial Least Squares for Nonlinear Structural Equation Models

Filter options

Publication date

Content availability

Publication type

Publication language

Keywords

Data set

Journal

INFONA - science communication portal

Search results for: K Dijkstra

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Content availability

Publication type

Publication language

Keywords

Data set

Journal

Reporting an error / abuse

Sending the report failed

Accessibility options