Herwig's Homepage

Work Phone: +43 316 873 6477
Work FAX: +43 316 873 106477

Email: HFriedl@TUGraz.at

Address:
Institute of Statistics
Graz University of Technology
Kopernikusgasse 24/III
A-8010 Graz, Austria

Announcements:

Within the framework of the Statistical Modeling Network at the University of Technology Graz, on September from 12th till 14th, 2017 there will be a workshop with Prof. Bettina Grün (IFAS, JKU Linz) about Flexible Mixture Modeling and Model-Based Clustering in R. Further information can be found on the workshop's webpage.

The 22nd Young Statisticians Meeting will be held from 13th till 15th October 2017, in Zagreb/Croatia.

Former Editor of:

Statistical Modelling: An International Journal

Austrian Journal of Statistics

Research Interests: Generalized Linear (Mixed) Models, Random Effect Models, Categorical Data Analysis, Resampling (Bootstrap, Jackknife, Cross-Validation).

Papers/manuscripts:

• Parvizi, D., Friedl, H., Wurzer, P., Kamolz, L.P., Lebo, P., Truca, A., Rappl, T., Wiedner, M., Kuess, K., Grohmann, M., and Koch, H. (2015): A Multiple Regression Analysis of Postoperative Complications after Body Contouring Surgery: A Retrospective Analysis of 205 Patients, Regression analysis of Complications, Obesity Surgery, 25, 1482-1490.
• Wurzer, P., Rappl, T., Friedl, H., Kamolz, L.P., Spendel, S., Hoflehner, H., and Parvizi, D. (2014): The Austrian Breast Implant Register: Recent Trends in Implant-based Breast Surgery. Aesthetic Plastic Surgery, 38, 1109-1115.
• Haas, D., Habib, J., Luxner, J., Galler, H., Zarfel, G., Schlacher, R., Friedl, H., and Reinthaler, F.F. (2014): Comparison of background levels of culturable fungal spore concentrations in indoor and outdoor air in Southeastern Austria. Atmospheric Environment, 98, 640-647.
• Rappl, T., Parvizi, D., Friedl, H., Wiedner, M., May, S., and Kranzelbinder B. (2013): Onset and Duration of Effect of IncobotulinumtoxinA, OnabotulinumtoxinA and AbobotulinumtoxinA in the Treatment of Glabellar Frown Lines: A Randomized, Double-blind Study. Clinical, Cosmetic and Investigational Dermatology, 6, 211-219.
• Littringer, E. M., Zellnitz, S., Hammernik, K., Adamer, V., Friedl, H., Griesser, U., and Urbanetz, N. A. (2013): Spray Drying of Aqueous Salbutamol Sulphate Solutions using the Nona Spray Dryer B-90 - The Impact of Process parameters on Particle Size. Drying Technology, 31, 1346-1353.
• Parvizi, D., Friedl, H., Schintler, M. V., Rappl, T., Laback, C., Wiedner, M., Vasiljeva, A., Kamolz, L. P., and Spendel S. (2013): Use of 2-octyl cyanoacrylate together with a self-adhering mesh (Dermabond™ Prineo™) for skin closure following abdominoplasty: an open, prospective, controlled, randomized, clinical study. Aesthetic Plastic Surgery, 37, 529-537.
• Feirer, V., Friedl, H., and Hirn, U. (2013): Modeling Over- and Underdispersed Frequencies of Successful Ink Transmission onto Paper. Journal of Applied Statistics, 40(3), 626-643.
• Haas, D., Galler, H., Posch, J., Zarfel, G., Buzina, W., Friedl, H., Marth, E., Habib, J., and Reinthaler, F. F. (2013): The Concentrations of Culturable Microorganisms in Relation to Particulate Matter in Urban Air. Atmospheric Environment, 65(1), 215-222.
• Friedl, H., Mirkov, R. and Steinkamp, A. (2012): Modeling and Forecasting Gas Flow on Exits of Gas Transmission Networks. International Statistical Review, 80(1), 24-39.
• Parvizi, D., Koch, H., Friedl, H., Spendel, S., Hubmer, M., Parvizi, I., Prandl, E., Rappl, T., and Haas, F. (2012): Analysis of Functional Outcome After Posttraumatic Thumb Reconstruction in Comparison to Nonreconstructed Amputated Thumbs at the Proximal Phalanx of the Thumb Ray: A Mid-Term Follow-Up With Special Attention to the Manchester-Modified M2 DASH Questionnaire and Effect Size of Cohen’s d. Journal of Trauma and Acute Care Surgery, 72(2), E33-E40.
• Mirkov, R., Friedl, H. and A. Steinkamp (2011): Nonlinear and Spline Regression Models for Forecasting Gas Flow on Exits of Gas Transmission Networks (eds. D. Conesa, A. Forte, A. Lopez-Quilez and F. Munoz). In: Proceedings of the 26th International Workshop on Statistical Modelling, 394-399.
• Neubauer, G. Djuras, G. and Friedl, H. (2011): Models for Underreporting: A Bernoulli Sampling Approach for Reported Counts. Austrian Journal of Statistics, 49(1&2), 85-92.
• Haas, D., Galler, H., Habib, J., Melkes, A., Schlacher, R., Buzina, W., Friedl, H., Marth, E., and Reinthaler, F. F. (2010): Concentrations of Viable Airborne Fungal Spores and Trichloroanisole in Wine Celars. International Journal of Food Microbiology, 144(1), 126-132.
• Friedl, H., Booth, J. (2010): Fitting Finite Mixture Models to Censored data. In: Computer Data Analysis and Modeling: Complex Stochastic Data and Systems, 58-65.
• Neubauer, G. Djuras, G. and Friedl, H. (2010): Models for Underreporting: A Bernoulli Sampling Approach for Reported Counts. In: Computer Data Analysis and Modeling: Complex Stochastic Data and Systems, 85-92.
• Mirkov, R., Friedl, H., Leövey, H., Römisch, W., Wegner-Specht, I. (2010): Sigmoid Models Utilized in Optimization of Gas Transportation Networks. In: Proceedings of the 25th International Workshop on Statistical Modelling (ed. A. W. Bowman), 381-385.
• Friedl, H. and Hörmann, S. (2008): Frequentist Probability Theory. In: Handbook of Probability: Theory and Applications (ed. T. Rudas), Sage Publications:Los Angeles, 15-34.
• Friedl, H. and Neubauer, G. (2007): Estimating Binomial Denominators. In: Proceedings of the 8h International Conference on Computer Data Analysis and Modeling, 68-75.
• Hofrichter, J. and Friedl, H. (2007): Change Point Detection for Panel Data Models. In: Proceedings of the 21st International Workshop on Statistical Modelling, 333-343.
• Friedl, H. and Neubauer, G. (2006): Modelling Sample Sizes of Frequencies. In: Proceedings of the 21st International Workshop on Statistical Modelling, 401-408.
• Hofrichter, J., Harum, T. and Friedl, H. (2006): Statistical Modelling of Annual Maxima in Hydrology. Austrian Journal of Statistics, 35, 21-30.
• Friedl, H. and Booth, J. (2005): Mixture Models for Left Censored Responses. In: Proceedings of the 20th International Workshop on Statistical Modelling, 179-185.
• Wüst, G., Friedl, H., et al. (2003): A Comparison between Andersen (ACFM) and Reuter Centrifugal Sampler (RCS-Plus) for Indoor Sampling of Airborne Molds, Aerobiologia, 19, 125-128.
• Booth, J., Casella, G., Friedl, H. and Hobert, J. (2003): Negative Binomial Loglinear Mixed Models, Statistical Modelling, 3, 179-191.
• Friedl, H. and Stampfer, E. (2002): Estimating General Variable Acceptance Sampling Plans by Bootstrap Methods, Journal of Applied Statistics, 29, 1205-1217.
• Friedl, H. and Stampfer, E. (2002): Cross-Validation, in: Encyclopedia of Environmetrics, Volume 1, Eds.: A. El-Shaarawi, W. Piegorsch, Wiley:Chichester, 452-460.
• Friedl, H. and Stampfer, E. (2002): Jackknife Resampling, in: Encyclopedia of Environmetrics, Volume 2, Eds.: A. El-Shaarawi, W. Piegorsch, Wiley:Chichester, 1089-1098.
• Friedl, H. and Stampfer, E. (2002): Resampling Methods, in: Encyclopedia of Environmetrics, Volume 3, Eds.: A. El-Shaarawi, W. Piegorsch, Wiley:Chichester, 1768-1770.
• Friedl, H. and Kauermann, G. (2000): Standard Errors for EM Estimates for Generalized Linear Models with Random Effects, Biometrics, 56, 761-767.
• Friedl, H. (1999): Pearson's Chi-Square, Farrington's Statistic, in: Encyclopedia of Statistical Sciences Update, Volume 3, Eds.: S. Kotz, C.R. Read, D.L. Banks, Wiley:New York, 576-578.
• Friedl, H. (1998): Nichtparametrische Maximum Likelihood Schätzung in Generalisierten Linearen Mischmodellen, Österreichische Zeitschrift für Statistik, 26, 7-30.
• Friedl, H. and Stadlober, E. (1997): Resampling Methods in Generalized Linear Models Useful in Environmetrics, Environmetrics, 8, 441-457.
• Friedl, H. (1997): On the Asymptotic Moments of a Pearson Type Statistics based on Resampling Procedures, Computational Statistics, 12, 265-277.
• Friedl, H. (1995): Variance Estimation in Generalized Linear Models Using the Bootstrap, Symposia Gaussiana, Conf. B, Eds.: Mammitzsch/Schneeweiss, Walter de Gruyter:Berlin, New York, 217-226.
• Friedl, H. and Hatzinger, R. (1995): A Note on Generating the Factors for Symmetry Parameters in Log-linear Models, GLIM Newsletter, 24, 33-36.
• Friedl, H. and Tilg, N. (1995): Variance Estimates in Logistic Regression Using the Bootstrap, Communications in Statistics - Theory and Methods, 24, 473-486.

Teaching: Mathematical Statistics (Statistical Inference), Generalized Linear Models, Computational Statistics, Nonparametric Statistics, Data Analysis, Regression Analysis, Generalized Linear Models (held in Ljubljana during May 2015), Seminar (Quantile Models)

Hiking: Vinschgau/South Tyrol (May 2006, June 2006, June 2007)
Hochschwab (Leiterlsteig, Ebenstein, Gamskogel )

Trekking: (Annapurna, March 2007, Dolpo, July 2010)

YSM: (Piran, Slovenia, October 2007, Balatonfüred, Hungary, October 2008), Vorau, Austria, October 2010)