Papers by Peter van der Heijden
Quality Engineering, 2011
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Journal of Infection, 2019
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Methodology, 2008
Like in ordinary regression models, in multilevel analysis, homoscedasticity of the residual vari... more Like in ordinary regression models, in multilevel analysis, homoscedasticity of the residual variances is an assumption that is mostly unchecked. However, in experimental research, the residual variance component at level two may differ in the experimental and the control condition, leading to heteroscedastic second level variances. Using a simulation study, the consequences of ignoring second level heteroscedasticity on the estimation of the fixed and random parameters and their standard errors was investigated. It was found that the standard error of the second level variance is underestimated, but that the estimated fixed parameters of the independent variables, the first level variance and their standard errors are mostly unbiased.
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Statistics in Medicine, 2004
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Nederlands tijdschrift voor geneeskunde, Jan 27, 2001
The capture-recapture method is useful for the estimation of the incidence and prevalence of a di... more The capture-recapture method is useful for the estimation of the incidence and prevalence of a disease if there exist multiple lists that can be linked. Some assumptions have to be fulfilled for the estimate to be adequate. For example, for every list every individual should have the same probability to be on the list, and the lists should be independent. In case of two lists one has to assume that these are independent in order to get an estimate. When three or more lists are available this strong assumption may be mitigated.
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Psychometrika, 2012
Most dichotomous item response models share the assumption of latent monotonicity, which states t... more Most dichotomous item response models share the assumption of latent monotonicity, which states that the probability of a positive response to an item is a nondecreasing function of a latent variable intended to be measured. Latent monotonicity cannot be evaluated directly, but it implies manifest monotonicity across a variety of observed scores, such as the restscore, a single item score, and in some cases the total score. In this study, we show that manifest monotonicity can be tested by means of the order-constrained statistical inference framework. We propose a procedure that uses this framework to determine whether manifest monotonicity should be rejected for specific items. This approach provides a likelihood ratio test for which the p-value can be approximated through simulation. A simulation study is presented that evaluates the Type I error rate and power of the test, and the procedure is applied to empirical data.
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Journal of Educational and Behavioral Statistics, 1997
Career data of an individual are defined by counts that describe the amount of time an individual... more Career data of an individual are defined by counts that describe the amount of time an individual has spent in each of a number of mutually exclusive states. It is argued that correspondence analysis is particularly suited to such data, and this is illustrated by an example from educational careers. Furthermore it is shown that correspondence analysis can be used for a quantification of individual careers into one or more scores, or a classification, that can then be used in further analyses.
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Journal of Clinical Child & Adolescent Psychology, 2013
The aim of the present study was to investigate the clinical usefulness of an observational tool-... more The aim of the present study was to investigate the clinical usefulness of an observational tool--the Disruptive Behavior Diagnostic Observation Schedule (DB-DOS)--in the diagnosis of disruptive behavior disorders (DBD) and attention deficit/hyperactivity disorder (ADHD) in preschoolers. We hypothesized that the DB-DOS may help support the presumption of a diagnosis generated by the information from parents and teachers (or other caregivers). Participants were referred preschool children with externalizing behavioral problems (N = 193; 83% male) and typically developing children (N = 58; 71% male). In view of the clinical validity study each child was given a diagnosis of either DBD (N = 40), or ADHD (N = 54) or comorbid (DBD + ADHD; N = 66) based on best-estimate diagnosis. The DB-DOS demonstrated good interrater and test-retest reliability for DBD and ADHD symptom scores. Confirmatory factor analysis demonstrated an excellent fit of the DB-DOS multidomain model of DBD symptom scores and a satisfactory fit of ADHD symptom scores. The DB-DOS demonstrated good convergent validity, moderate divergent validity, and good clinical validity on a diagnostic group level for DBD and ADHD symptom scores. The Receiver Operating Characteristic curve analyses revealed that for DBD the sensitivity and specificity are moderate and for ADHD good to excellent. The presumption of a diagnosis based on information from parents, teachers, and cognitive assessment was supported by the DB-DOS in 60% for DBD and 75% for ADHD. The DB-DOS can be used to help support a presumption of a DBD and/or ADHD diagnosis in preschool children.
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Journal of Abnormal Child Psychology, 2014
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Journal of Abnormal Child Psychology, 2013
The aim of the present study was to investigate the clinical usefulness of a semi-structured diag... more The aim of the present study was to investigate the clinical usefulness of a semi-structured diagnostic parent interview, i.e., the Kiddie-Disruptive Behavior Disorder Schedule (K-DBDS), in preschool children. For Oppositional Defiant Disorder (ODD), to define symptoms two coding methods were compared, i.e., one based on the threshold "often" and the other based on the frequency of behaviors in combination with the presence of clinical concern. For Attention-Deficit/Hyperactivity Disorder (ADHD), to define symptoms, two coding methods were compared, i.e., one with and one without consideration of pervasiveness across contexts. Participants were referred preschool children with externalizing behavioral problems (N = 193; 83% male) and typically developing (TD) children (N = 58; 71% male). The referred children were given a diagnosis of either ODD/CD (N = 39), or ADHD (N = 58) or comorbid ODD/CD+ADHD (N = 57) or no diagnosis (N = 39) based on best-estimate diagnosis. Receiver Operating Characteristic curve analyses showed that a cutoff score of four ODD symptoms using "often" as the threshold for frequency of behaviors led to a sensitivity of 87% and a specificity of 93%; the coding method which included the frequency of behaviors yielded a sensitivity of 56% and a specificity of 100%. For ADHD, a clinical cutoff score of five symptoms without the pervasiveness criterion yielded a sensitivity of 83% and a specificity of 98%; when the pervasiveness criterion was included sensitivity was 77% and specificity 98%. In the clinical assessment of ODD and ADHD in preschool children, the K-DBDS may be used with ODD symptom definition based on the threshold "often" and ADHD pervasiveness across contexts not included.
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Tijdschrift voor …, 1995
In twee studies heeft Bruinsma (1991, 1994) op basis van empirisch materiaal uitspraken gedaan ov... more In twee studies heeft Bruinsma (1991, 1994) op basis van empirisch materiaal uitspraken gedaan over de test-hertest betrouwbaarheid van de self-report méthode. In beide studiesliethij een groepmenseneeni£?//-/'£> ponvragenlijst invullen. Na een korte période ...
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Statistical Modelling, Dec 1, 2003
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Capture-Recapture Methods for the Social and Medical Sciences, 2017
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Proceedings of the 13th International Joint Conference on Biomedical Engineering Systems and Technologies, 2020
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The aim of the study is to assess the validity of the responses to sensitive questions on social ... more The aim of the study is to assess the validity of the responses to sensitive questions on social security fraud obtained using four different methods. We compare two different varieties of randomized response with CASAQ and direct questioning in an experimental setting. Validity could be assessed because all respondents interviewed had already been identified as committing social security fraud. The experiment was set up in such a way that the interviewers did not know that respondents had been caught for fraud, and the respondents did not know that the researchers had this information. Since the actual status of the respondents is known, it is possible to compare the results of the four approaches by comparing the percentage of false negatives. Two additional questions are these: which respondents are willing to admit to having practised fraud, and are the respondent characteristics that predict positive responses to the sensitive questions the same for all methods? For the direct ...
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Journal of Data Science, 2021
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Journal of Official Statistics, 2021
The size of a partly observed population is often estimated with the capture-recapture model. An ... more The size of a partly observed population is often estimated with the capture-recapture model. An important assumption of this chat model is that sources can be perfectly linked. This assumption is of relevance if the identification of records is not obtained by some perfect identifier (such as an id code) but by indirect identifiers (such as name and address). In that case, the perfect linkage assumption is often violated, which in general leads to biased population size estimates. Initial suggestions to solve this use record linkage probabilities to correct the capture-recapture model. In this article we provide a general framework, based on the standard log-linear modelling approach, that generalises this work towards the inclusion of additional sources and covariates. We show that the method performs well in a simulation study.
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PLOS ONE, 2018
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Papers by Peter van der Heijden