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Nonparametric predictive multiple comparisons of lifetime data (2012)
Journal Article
Coolen-Maturi, T., Coolen-Schrijner, P., & Coolen, F. (2012). Nonparametric predictive multiple comparisons of lifetime data. Communications in Statistics - Theory and Methods, 41(22), 4164-4181. https://doi.org/10.1080/03610926.2011.569863

We consider lifetime experiments to compare units from different groups, where the units’ lifetimes may be right censored. Nonparametric predictive inference for comparison of multiple groups is presented, in particular lower and upper probabilities... Read More about Nonparametric predictive multiple comparisons of lifetime data.

Nonparametric predictive inference for binary diagnostic tests (2012)
Journal Article
Coolen-Maturi, T., Coolen-Schrijner, P., & Coolen, F. (2012). Nonparametric predictive inference for binary diagnostic tests. Journal of statistical theory and practice, 6(4), 665-680. https://doi.org/10.1080/15598608.2012.719800

Measuring the accuracy of diagnostic tests is crucial in many application areas, including medicine, health care, and data mining. Good methods for determining diagnostic accuracy provide useful guidance on selection of patient treatment, and the abi... Read More about Nonparametric predictive inference for binary diagnostic tests.

Nonparametric predictive inference for diagnostic accuracy (2012)
Journal Article
Coolen-Maturi, T., Coolen-Schrijner, P., & Coolen, F. (2012). Nonparametric predictive inference for diagnostic accuracy. Journal of Statistical Planning and Inference, 142(5), 1141-1150. https://doi.org/10.1016/j.jspi.2011.11.015

Measuring the accuracy of diagnostic tests is crucial in many application areas including medicine and health care. Good methods for determining diagnostic accuracy provide useful guidance on selection of patient treatment, and the ability to compare... Read More about Nonparametric predictive inference for diagnostic accuracy.

Unobserved, re-defined, unknown or removed failure modes in competing risks (2011)
Journal Article
Coolen-Maturi, T., & Coolen, F. (2011). Unobserved, re-defined, unknown or removed failure modes in competing risks. Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability, 225(4), 461-474. https://doi.org/10.1177/1748006x11401706

Recently the nonparametric predictive approach to inference for competing risks was introduced by Maturi et al. (2010, J. Risk Reliab. 224, 11–26). In this paper further results for such inferences are presented, with focus on four important and clos... Read More about Unobserved, re-defined, unknown or removed failure modes in competing risks.

A Comparison of Correlation Coefficients via a Three-Step Bootstrap Approach (2010)
Journal Article
Maturi, T. A., & Elsayigh, A. (2010). A Comparison of Correlation Coefficients via a Three-Step Bootstrap Approach. Journal of Mathematics Research, 2(2), 3-10. https://doi.org/10.5539/jmr.v2n2p3

In this paper we compare ten correlation coefficients using a three-step bootstrap approach (TSB). A three-step bootstrap is applied to determine the optimal repetitions, B, to estimate the standard error of the statistic with certain degree of accur... Read More about A Comparison of Correlation Coefficients via a Three-Step Bootstrap Approach.

Nonparametric predictive comparison of lifetime data under progressive censoring (2009)
Journal Article
Maturi, T. A., Coolen-Schrijner, P., & Coolen, F. P. A. (2010). Nonparametric predictive comparison of lifetime data under progressive censoring. Journal of Statistical Planning and Inference, 140(2), 515-525. https://doi.org/10.1016/j.jspi.2009.07.027

In reliability and lifetime testing, comparison of two groups of data is a common problem. It is often attractive, or even necessary, to make a quick and efficient decision in order to save time and costs. This paper presents a nonparametric predicti... Read More about Nonparametric predictive comparison of lifetime data under progressive censoring.

The Correlation between Variate-Values and Ranks in Samples from Complete Fourth Power Exponential Distribution (2009)
Journal Article
Maturi, T., & Elsayigh, A. (2009). The Correlation between Variate-Values and Ranks in Samples from Complete Fourth Power Exponential Distribution. Journal of Mathematics Research, 1(1), 14-18. https://doi.org/10.5539/jmr.v1n1p14

In this paper, we derive the correlation between variate-values and ranks in a sample from the Complete Fourth Power Exponential (CFPE) distribution. A sample from the CFPE distribution could be misclassified as if it is drawn from the normal distrib... Read More about The Correlation between Variate-Values and Ranks in Samples from Complete Fourth Power Exponential Distribution.

A New Weighted Rank Correlation (2008)
Journal Article
Maturi, T. A., & Abdelfattah, E. (2008). A New Weighted Rank Correlation. Journal of mathematics and statistics, 4(4), 226-230. https://doi.org/10.3844/jmssp.2008.226.230

Problem Statement: There have been many cases in real life where two independent sources have ranked n objects, with the interest focused on agreement in the top rankings. Spearman's rho and Kendall's tau coefficients assigned equal weights to all ra... Read More about A New Weighted Rank Correlation.