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:

A former colleague of mine, Ernst Stadlober, received the Gerhart-Bruckmann award 2022 of the Austrian Statistical Society.

The Austrian and Slovenian Statistical Days have been held from April 20th till 22nd, 2022 at Graz University of Technology.

The 25th Young Statisticians Meeting Anniversary have been held from 15th till 17th October 2021, in Vorau, Austria.

Former Editor of:

Statistical Modelling: An International Journal

Austrian Journal of Statistics

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

Papers/manuscripts:

• Omerovic, S., Friedl, H., and Grün, B. (2022): Modelling Multiple Regimes in Economic Growth by Mixtures of Generalised Nonlinear Models Econometrics and Statistics. 22(C), 124-135
• Böhning, D. and Friedl, H. (2021): Population size estimation based upon zero-truncated, one-inflated and sparse count data: Estimating the number of dice snakes in Graz and flare stars in the Pleiades. Statistical Methods & Applications. 30(4), 1197-1217.
• Brinskelle, P., König, E., Sendlhofer, G., Baumhackl, K. A., Winter, R., Sawetz, I., Kamolz, L-P., Steinmetz, I., Friedl, H., and Lumenta, D. B. (2020): Is there a risk for bacterial transmission from surgical marker pens? The Journal of Hospital Infection. 106(2), 254-257.
• Friedl, H. and Böhning, D. (2020): Capture-recapture in case of one-inflation. Proceedings of the 35th International Workshop on Statistical Modelling: July 20-24, 2020 - Bilbao, Basque Country, Spain. Irigoien, I., Lee, D-J., Martinez-Minaya, J., and Rodriguez-Alvarez, M. X. (editors). 86-90.
• Auinger, D., Sandner-Kiesling, A., Strießnig, A., Lindenmann, J., Smolle, J., Friedl, H., and Smolle-Jüttner, F-M. (2020): Is There an Impact of Sex on Acute Postthoracotomy Pain? A Retrospective Analysis The Annals of Thoracic Surgery. 109(4), 1104-1111.
• Winter, R., Reischies, F., Tuca, A., Wurzer, P., Schubert, C., Wolfsberger, C., Rienmüller, T. M., Friedl, H., Sljivich, M., and Kamolz, L-P. (2019): BMI and specimen weight: impact on personalized risk profiling for optimized informed consent in breast reduction surgery? Scientific Reports. 9, 12690.
• Friedl, H. and Omerovic, S. (2019): Mixtures of Generalized Nonlinear Models. Proceedings of the 34th International Workshop of Statistical Modelling I: July 7-12, 2019 - Guimarães, Portugal. Luís Meira-Machado and Gustavo Soutinho (editors). 151-156
• Winter, R., Steinböck, M., Leinich, W., Reischies, F., Feigl, G., Sljivich, M., Friedl, H., Hubmer, M., and Koch, H. (2019): The reverse Latissimus dorsi flap - an anatomical study and retrospective analysis of its clinical application. Journal of Plastic, Reconstructive & Aesthetic Surgery.
• Walch, S., Edtmayer, J., Hick, H., Wopelka, T., and Friedl, H. (2018): Multimethod Concept for Continuous Wear-Analysis of the Piston Group. SAE Technical Paper 2018-01-0839.
• Smolle, C., Sendlhofer, G., Cambiaso-Daniel, J., Sljivich, M., Friedl, H., Kamolz, L.-P., and Brunner, G. (2018): Official definitions for undesirable medical event: Are they correctly applied in medicine? Wiener Klinische Wochenschrift.
• Karasek, S., Friedl, H., and Scheibelhofer, P. (2018): Statistical Analysis of Semiconductor Images. Proceedings of the 33rd International Workshop on Statistical Modelling: 15th-20th July 2018, Bristol UK. University of Bristol, 1. 151-156.
• Winter, R., Haug, I., Lebo, P., Grohmann, M., Reischies, F., Cambiaso-Daniel, J., Tuca, A., Rienmüller, T. M., Friedl, H., Spendel, S., Forbes, A., Wurzer, P., and Kamolz, L-P. (2017): Standardizing the complication rate after breast reduction using the Clavien-Dindo classification. Surgery. 161, 1430-1435.
• Smolle, C., Tuca, A., Wurzer, P., Spendel, S., Forbes, A., Spendel, S., Schintler, M., Haxhija, E., Schwenzer-Zimmerer, K., Friedl, H., Kamolz, L-P., and Parvizi, D. (2017): Complications in tissue expansion: A logistic regression analysis for risk factors. Burns, 43, 1195-1202.
• 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, Data Analysis and Introduction to R, Regression Analysis, Generalized Linear Models and Multilevel Analysis (taught in Ljubljana May 2021), Generalized Linear Models and Multilevel Analysis (taught in Moscow November 2020),

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

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

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