Lorentz JÄNTSCHI (lori) works ?id=275
- [id] => 275
- [recorddate] => 2016:08:25:12:17:46
- [lastupdate] => 2016:08:25:12:17:46
- [type] => conference
- [place] => Sofia, Bulgaria
- [subject] => chemistry - computational; informatics - models implementation; mathematics - modeling; mathematics - statistics
- [relatedworks] =>
- 2 (average):
- Molecular hyperstructures with high symmetry, ?id=169
- The effects on sensitivity of the structure-activity models, ?id=264
- 3 (low):
- Modeling the octanol-water partition coefficient of substituted phenols by the use of structure information, ?id=107
- Is simple randomization of compounds in training and test set as good as other methods used in quantitative structure-activity experiments?, ?id=255
- Parameterizing the influence of the atom type on highly symmetry structures, ?id=285
- 4 (some):
- Informational entropy of b-ary trees after a vertex cut, ?id=175
- Statistical approach of structure-activity relationships: a case study, ?id=181
- The relationship between energy calculations and boiling points of n-alkanes, ?id=231
- Diagnostic of a QSPR model: aqueous solubility of drug-like compounds, ?id=232
- Full factorial analysis on one-cage pentagonal faced nanostructures, ?id=292
- Multiple linear regressions by maximizing the likelihood under assumption of generalized Gauss-Laplace distribution of the error, ?id=299
- Extending characteristic polynomial from graphs to molecules, ?id=303
- Geometry optimization of nC24 cyclic polyyne cluster [presentation], ?id=305
- [file] => ?f=275
- [mime] => application/pdf
- [size] => 1173206
- [pubname] => BIOMATH International Conference on Mathematical Methods and Models in Biosciences, June 18-19, 2013
- [pubinfo] => University of Plovdiv
- [pubkey] => ISSN 2367-5233, eISSN 2367-5241
- [workinfo] => Invited lecture, June 18, 2013, 1500-1540
- [year] => 2013
- [title] => Linear regression modeling and validation strategies for structure-activity relationships
- [authors] => Sorana D. BOLBOACĂ, Lorentz JÄNTSCHI
- [abstract] =>
Identification and development of a new active compounds is an extremely expensive (reflected in time - between 10 and 15 years  and costs) and difficult process without a guaranteed result  (~ 90% of the initial candidates fail to be produces due to their toxicological properties ).
Traditional strategies based on experiments (animal models ) are not anymore able to meet the actual needs in identification of new active compounds while in silico approaches such as computer-aided drug design , structure-based drug design , or virtual screening , are used nowadays.
Quantitative structure-activity relationships (QSARs) are mathematical relationships linking chemical structure and pharmacological activity/property in a quantitative manner for a series of compounds .
The approaches are based on the assumption that the structure of chemical compounds (such as geometric, topologic, steric, electronic properties, etc.) contains features responsible for its physical, chemical and biological properties .
The linear regression analysis is the statistical method frequently used in QSAR analysis since the main aim of the modeling is to identify a model able to predict the activity of new compounds .
Problems solving strategies in linear regression modeling include approaches for dealing with effective assessment of assumptions (linearity, independence of the errors, homoscedasticity, normality ), which seems to be broken in QSARs analyses [12,13]; effective methods for model selection [11,14,15]; efficient methods for model diagnosis [16,17]; and adequate approaches for assessment of predictive power of a QSAR model [18,19].
Here we emphasize problem solving strategies that address the main issues that arise when developing multivariate linear regression models using real data.
Other problems not addressed here include the dealing with not normal distributed errors [20,21] and additional methods for estimation of regression parameters .
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 S.D. Bolboaca, and L. Jantschi, Distribution Fitting 3. Analysis under Normality Asumptions, Bulletin UASVM Horticulture 66(2), 2009, 698-705.
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 R.E. Sestras, L. Jantschi, and S.D. Bolboaca, Poisson Parameters of Antimicrobial Activity: A Quantitative Structure-Activity Approach, Int J Mol Sci 13(4), 2012, 5207–5229.
 S.D. Bolboaca, and L. Jantschi, Predictivity Approach for Quantitative Structure-Property Models. Application for Blood-Brain Barrier Permeation of Diverse Drug-Like Compounds, Int J Mol Sci 12(7), 2011, 4348–4364.
 S.D. Bolboaca, and L. Jantschi, Comparison of QSAR Performances on Carboquinone Derivatives, TheScientificWorldJOURNAL 9(10), 2009, 1148–1166.
 S.D. Bolboaca, and L. Jantschi, The Effect of Leverage and/or Influential on Structure-Activity Relationships, Comb Chem High Throughput Screen 16(4), 2013, 288–297.
 L. Jantschi, and S.D. Bolboaca, Observation vs. Observable: Maximum Likelihood Estimations according to the Assumption of Generalized Gauss and Laplace Distributions, Leonardo El J Pract Technol 8(15), 2009, 81–104.
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 L. Jantschi, Distribution Fitting 1. Parameters Estimation under Assumption of Agreement between Observation and Model, Bulletin UASVM Horticulture 66(2), 2009, 684-690.
- [keywords] => quantitative structure-activity relationships (QSARs); linear regression analysis; model design; validation and diagnosis