Search Results - "Hron, K"

A new method for correlation analysis of compositional (environmental) data – a worked example by Reimann, C., Filzmoser, P., Hron, K., Kynčlová, P., Garrett, R.G.

“…Most data in environmental sciences and geochemistry are compositional. Already the unit used to report the data (e.g., μg/l, mg/kg, wt%) implies that the…”
Get full text

Imputation of missing values for compositional data using classical and robust methods by Hron, K., Templ, M., Filzmoser, P.

“…New imputation algorithms for estimating missing values in compositional data are introduced. A first proposal uses the k -nearest neighbor procedure based on…”
Get full text

Linear regression with compositional explanatory variables by Hron, K., Filzmoser, P., Thompson, K.

“…Compositional explanatory variables should not be directly used in a linear regression model because any inference statistic can become misleading. While…”
Get full text

Cox regression survival analysis with compositional covariates: Application to modelling mortality risk from 24-h physical activity patterns by McGregor, DE, Palarea-Albaladejo, J, Dall, PM, Hron, K, Chastin, SFM

“…Survival analysis is commonly conducted in medical and public health research to assess the association of an exposure or intervention with a hard end outcome…”
Get full text

Classical and Robust Regression Analysis with Compositional Data by van den Boogaart, K. G., Filzmoser, P., Hron, K., Templ, M., Tolosana-Delgado, R.

“…Compositional data carry their relevant information in the relationships (logratios) between the compositional parts. It is shown how this source of…”
Get full text

Robust principal component analysis for compositional tables by de Sousa, J., Hron, K., Fačevicová, K., Filzmoser, P.

“…A data table arranged according to two factors can often be considered a compositional table. An example is the number of unemployed people, split according to…”
Get full text

Model-based replacement of rounded zeros in compositional data: Classical and robust approaches by Martín-Fernández, J.A., Hron, K., Templ, M., Filzmoser, P., Palarea-Albaladejo, J.

“…The log-ratio methodology represents a powerful set of methods and techniques for statistical analysis of compositional data. These techniques may be used for…”
Get full text

Principal balances of compositional data for regression and classification using partial least squares by Nesrstová, V., Wilms, I., Palarea‐Albaladejo, J., Filzmoser, P., Martín‐Fernández, J. A., Friedecký, D., Hron, K.

“…High‐dimensional compositional data are commonplace in the modern omics sciences, among others. Analysis of compositional data requires the proper choice of a…”
Get full text

Compositional biplots including external non-compositional variables by Kynčlová, P., Filzmoser, P., Hron, K.

“…Biplots represent a widely used statistical tool for visualizing the resulting loadings and scores of a dimension reduction technique applied to multivariate…”
Get full text

A robust Parafac model for compositional data by Di Palma, M. A., Filzmoser, P., Gallo, M., Hron, K.

“…Compositional data are characterized by values containing relative information, and thus the ratios between the data values are of interest for the analysis…”
Get full text

Exploratory tools for outlier detection in compositional data with structural zeros by Templ, M., Hron, K., Filzmoser, P.

“…The analysis of compositional data using the log-ratio approach is based on ratios between the compositional parts. Zeros in the parts thus cause serious…”
Get full text

Preprocessing of centred logratio transformed density functions using smoothing splines by Machalová, J., Hron, K., Monti, G.S.

“…With large-scale database systems, statistical analysis of data, occurring in the form of probability distributions, becomes an important task in explorative…”
Get full text

Dam reservoirs as an efficient trap for historical pollution: the passage of Hg and Pb through the Ohře River, Czech Republic by Majerová, L., Bábek, O., Navrátil, T., Nováková, T., Štojdl, J., Elznicová, J., Hron, K., Matys Grygar, T.

“…The concentration of Hg and Pb pollutants was examined in sediments of a central European lowland river, the Ohře River. The pollution originated from several…”
Get full text

Coffee aroma—Statistical analysis of compositional data by Korhoňová, M., Hron, K., Klimčíková, D., Müller, L., Bednář, P., Barták, P.

“…Solid-phase microextraction in headspace mode coupled with gas chromatography–mass spectrometry was applied to the determination of volatile compounds in 30…”
Get full text

Classical and robust orthogonal regression between parts of compositional data by Hrůzová, K., Todorov, V., Hron, K., Filzmoser, P.

“…The different parts (variables) of a compositional data set cannot be considered independent from each other, since only the ratios between the parts…”
Get full text

Statistical analysis of wines using a robust compositional biplot by Hron, K., Jelínková, M., Filzmoser, P., Kreuziger, R., Bednář, P., Barták, P.

“…► Phenolic acids determined in wines by gas chromatography–mass spectrometry. ► Application of centered log-ratio transformation for better data…”
Get full text

Logratio approach to statistical analysis of 2×2 compositional tables by Fačevicová, K., Hron, K., Todorov, V., Guo, D., Templ, M.

“…Compositional tables represent a continuous counterpart to well-known contingency tables. Their cells contain quantitatively expressed relative contributions…”
Get full text

Tracing the drainage change in the Po basin from provenance of Quaternary sediments (Collina di Torino, Italy) by Vezzoli, G., Forno, M.G., Andò, S., Hron, K., Cadoppi, P., Rossello, E., Tranchero, V.

“…Quantitative provenance analysis of the Quaternary sediments from the Collina di Torino and the Po alluvial plain was assessed by using statistical techniques…”
Get full text

Chemical markers in the aroma profiles of South Moravian red wine distillates by Veverka, L., Mendelova Univ., Lednice (Czech Republic). Ustav Poskliznove Technologie Zahradnickych Produktu, Jelinkova, M., Univerzita Palackeho, Olomouc (Czech Republic). Katedra Analyticke Chemie, Hron, K., Univerzita Palackeho, Olomouc (Czech Republic). Katedra Matematicke Analyzy a Aplikaci Matematiky, Balik, J., Mendelova Univ., Lednice (Czech Republic). Ustav Poskliznove Technologie Zahradnickych Produktu, Stavek, J., Mendelova Univ., Lednice (Czech Republic). Ustav Poskliznove Technologie Zahradnickych Produktu, Bartak, P., Univerzita Palackeho, Olomouc (Czech Republic). Katedra Analyticke Chemie

“…HSSPME-GC/MS method was used to investigate the volatile compounds responsible for varietal character in the aroma of wine distillates made from 16 different…”
Get full text

Simplicial principal component analysis for density functions in Bayes spaces by Hron, K., Menafoglio, A., Templ, M., Hrůzová, K., Filzmoser, P.

“…Probability density functions are frequently used to characterize the distributional properties of large-scale database systems. As functional compositions,…”
Get full text