J. Shabbir

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An introduction to statistical learning with applications in R

Fariha Sohil, Muhammad Umair Sohali, J. Shabbir, 2021, Statistical Theory and Related Fields.

On the ratio method of estimation via auxiliary attributes in simple and stratified random sampling

J. Shabbir, B. Lausen, Zardad Khan, 2013 .

Compromise Allocation for Mean Estimation in Stratified Random Sampling Using Auxiliary Attributes When Some Observations are Missing

J. Shabbir, Y. Muhammad, Sidra Naz, 2014 .

Spatial Distribution of Sulfate Concentration in Groundwater of South-Punjab, Pakistan

Muhammad Yousaf Shad, J. Shabbir, I. Hussain, 2015, Water Quality, Exposure and Health.

On use of Ranked Set Sampling for estimating Super-population Total: Gamma Population Model

J. Shabbir, Shakeel Ahmed, 2019, Scientia Iranica.

Estimation of interquartile range in stratified sampling under non-linear cost function

J. Shabbir, Aneel Ahmed, 2019, Commun. Stat. Simul. Comput..

Generalized exponential-type ratio-cum ratio estimators of population mean in ranked set and stratified ranked set sampling

Javid Shabbir, J. Shabbir, Lakhkar Khan, 2017 .

Bayesian Estimation of 3-Component Mixture of the Inverse Weibull Distributions

J. Shabbir, M. Aslam, Tabasam Sultana, 2017, Iranian Journal of Science and Technology, Transactions A: Science.

An alternative item sum technique for improved estimators of population mean in sensitive surveys

J. Shabbir, Z. Hussain, Naila Shabbir, 2017 .

Dual Use of Auxiliary Information for Estimating the Finite Population Mean under the Stratified Random Sampling Scheme

J. Shabbir, M. Aamir, Zubair Ahmad, 2021, Journal of Mathematics.

Assessing the adequacy of first order approximations in ratio type estimators

J. Shabbir, Sat Gupta, Tanja Zatezalo, 2018, Journal of Interdisciplinary Mathematics.

Using extreme values and fractional raw moments for mean estimation in stratified random sampling

J. Shabbir, Shoaib Ali, Manzoor Khan, 2016 .

A New Difference-Cum-Exponential Type Estimator of Finite Population Mean in Simple Random Sampling

J. Shabbir, A. Haq, Sat Gupta, 2014 .

A New Dierence-Cum-Exp onential Type Estimator of Finite Population Mean in Simple Random Sampling Un nuevo estimador tipo diferencia-cum-exponencial de la media de una población finita en muestras aleatorias simple

J. Shabbir, A. Haq, Sat Gupta, 2014 .

Some Improved Ratio, Product, and Regression Estimators of Finite Population Mean When Using Minimum and Maximum Values

J. Shabbir, Manzoor Khan, 2013, TheScientificWorldJournal.

Ranked set sampling with scrambled response model to subsample non-respondents

J. Shabbir, Shakeel Ahmed, 2017 .

Hansen and Hurwitz estimator with scrambled response on the second call

J. Shabbir, G. Diana, S. Riaz, 2014 .

Calibrated estimators using non-linear calibration constraints

J. Shabbir, Sarjinder Singh, Shameem Alam, 2020 .

A new disclosure index for Non-Governmental Organizations

J. Shabbir, Ayesha Nazuk, A. Nazuk, 2018, PloS one.

ON ALTERNATIVE ESTIMATION TECHNIQUES FOR RANDOMIZED RESPONSE MODELS

J. Shabbir, Z. Hussain, Muhammad Hamraz, 2013 .

Improved Estimation of Mean in Randomized Response Models ABSTRACT | FULL TEXT

J. Shabbir, Z. Hussain, 2011 .

On Some Families of Estimators of Variance of Post-Stratified Sample Mean Using Two Auxiliary Variables

J. Shabbir, S. Masood, 2015 .

Comparison of Modified Extended Lexicographic Technique with Fuzzy and Value Function Techniques Using the Auxiliary Information as Attributes

J. Shabbir, Y. Muhammad, Saima Khan, 2015 .

On Estimating the Finite Population Mean Using Two Auxiliary Variables in Two Phase Sampling in the Presence of Non Response

J. Shabbir, Nasir Khan, 2013 .

An Estimation of Sensitive Proportion Utilizing Higher Order Moments of Auxiliary Variable

J. Shabbir, Z. Hussain, 2011 .

A class of hybrid type estimators for variance of a finite population in simple random sampling

J. Shabbir, A. Sanaullah, Iqra Niaz, 2020, Commun. Stat. Simul. Comput..

BAYESIAN ESTIMATION OF POPULATION PROPORTION IN KIM AND WARDE MIXED RANDOMIZED RESPONSE TECHNIQUE

J. Shabbir, Z. Hussain, 2012 .

Bayesian Estimation Using Warner's Randomized Response Model through Simple and Mixture Prior Distributions

J. Shabbir, Z. Hussain, M. Riaz, 2010, Commun. Stat. Simul. Comput..

IMPROVED ESTIMATION OF FINITE POPULATION MEDIAN UNDER TWO-PHASE SAMPLING WHEN USING TWO AUXILIARY VARIABLES

Zawar Hussain, Javid Shabbir, Sat Gupta, 2015 .

Efficient Estimation of Population Median Using Supplementary Variable

J. Shabbir, A. Khalil, Siraj Muneer, 2020, Scientia Iranica.

A New Estimator of Population Mean in Stratified Sampling

J. Shabbir, Sat Gupta, 2006 .

Unbiased ratio estimators of the mean in stratified ranked set sampling

J. Shabbir, Sat Gupta, Lakhkar Khan, 2017 .

A New Sampling Design for Systematic Sampling

J. Shabbir, Sat Gupta, Zaheen Khan, 2013 .

Generalized ratio-type and ratio-exponential-type estimators for population mean under modified Horvitz-Thompson estimator in adaptive cluster sampling

J. Shabbir, F. Younis, 2019, Journal of Statistical Computation and Simulation.

Use of scrambled responses on two occasions successive sampling under non-response

J. Shabbir, Noreen Naeem, 2016 .

IMPROVED ESTIMATION PROCEDURES FOR THE MEAN OF SENSITIVE VARIABLE USING RANDOMIZED RESPONSE MODEL

J. Shabbir, Z. Hussain, 2009 .

On an Improved Bayesian Item Count Technique Using Different Priors

Ejaz Ali Shah, J. Shabbir, Z. Hussain, 2013 .

Model based estimation of population total in presence of non-ignorable non-response

J. Shabbir, Shakeel Ahmed, 2019, PloS one.

Estimation of General Parameter Under Stratified Adaptive Cluster Sampling Based on Dual Use of Auxiliary Information

J. Shabbir, F. Younis, 2019, Scientia Iranica.

On improved class of difference type estimators for population median in survey sampling

J. Shabbir, Sat Gupta, Ghulam Narjis, 2020, Communications in Statistics - Theory and Methods.

Modified ranked set sampling schemes for estimating the population mean

J. Shabbir, A. Khalil, Lakhkar Khan, 2019, Journal of Statistics and Management Systems.

A new systematic ranked set-sampling scheme for symmetric distributions

J. Shabbir, U. Khalil, Lakhkar Khan, 2019, Life Cycle Reliability and Safety Engineering.

A GENERAL CLASS OF ESTIMATORS FOR FINITE POPULATION MEAN IN THE PRESENCE OF NON-RESPONSE WHEN USING THE SECOND RAW MOMENTS

J. Shabbir, Manzoor Khan, 2013 .

An improved general class of estimators for finite population mean in simple random sampling

J. Shabbir, Sat Gupta, S. Masood, 2020, Communications in Statistics - Theory and Methods.

Partial Randomized Response Model for Simultaneous Estimation of Means of Two Sensitive Variables

J. Shabbir, Rodney Onyango, Ghulam Narjis, 2022, Mathematical Problems in Engineering.

Estimating Prevalence of Sensitive Attribute with Optional Unrelated Question Randomized Response Models under Simple and Stratified Random Sampling

J. Shabbir, Ghulam Narjis, 2019, Scientia Iranica.

A two-stage design for multivariate estimation of proportions

J. Shabbir, Fatima Batool, 2016 .

Generalized Scrambling in Quantitative Optional Randomized Response Models

J. Shabbir, Sat Gupta, Samridhi Mehta, 2013 .

ON ESTIMATION OF MEAN OF A SENSITIVE QUANTITATIVE VARIABLE IN COMPLEX SURVEYS

J. Shabbir, Z. Hussain, 2009 .

ESTIMATION OF MEAN OF A SENSITIVE QUANTITATIVE VARIABLE

J. Shabbir, Z. Hussain, 2007 .

Calibration estimation of mean by using double use of auxiliary information

J. Shabbir, Shameem Alam, 2020, Commun. Stat. Simul. Comput..

Generalized multi-phase regression-type estimators under the effect of measuemnent error to estimate the population variance

J. Shabbir, S. Masood, 2016 .

Estimating Variance of Stratified Random Sample Mean in Two Phase Sampling Using Two Auxiliary Variables

J. Shabbir, Sat Gupta, 2010 .

Jackknife winsorized variance estimator under imputed data

Fariha Sohil, J. Shabbir, Sat Gupta, 2022, Statistics in Transition New Series.

Multivariable prognostic model for dialysis patients with end stage renal disease

J. Shabbir, A. Kimber, M. Siddiqa, 2021, Saudi medical journal.

A Novel Basis Function Approach to Finite Population Parameter Estimation

Javid Shabbir, Shakeel Ahmed, J. Shabbir, 2021, Scientia Iranica.

FDG-PET Scanning : Cancer of the Oesophagus HRT : Have We Changed ?

J. Shabbir, O. Breathnach, D. McCormack, 2007 .

Multi-objective Compromise Allocation in Multivariate Stratified Sampling Using Extended Lexicographic Goal Programming with Gamma Cost Function

Javid Shabbir, Yousaf Shad Muhammad, Ijaz Hussain, 2015, J. Math. Model. Algorithms Oper. Res..

Generalized geometric distribution of order k: A flexible choice to randomize the response

Zahid Pervez, Said Farooq Shah, Zawar Hussain, 2017, Commun. Stat. Simul. Comput..

A generalized class of estimators for sensitive variable in the presence of measurement error and non-response

J. Shabbir, Erum Zahid, Rodney Onyango, 2022, PLoS ONE.

On Using the Conventional and Nonconventional Measures of the Auxiliary Variable for Mean Estimation

Javid Shabbir, Sat Gupta, Ronald Onyango, 2021, Mathematical Problems in Engineering.

A two-stage unrelated question randomized response model for estimating the rare sensitive parameter under Poisson distribution

J. Shabbir, Ghulam Narjis, 2020, Communications in Statistics - Theory and Methods.

Estimation of population distribution function involving measurement error in the presence of non response

J. Shabbir, Mazhar Yaqub, 2020, Communications in Statistics - Theory and Methods.

Estimation of finite population mean for a sensitive variable using dual auxiliary information in the presence of measurement errors

J. Shabbir, Erum Zahid, 2019, PloS one.

Estimation of population mean in the presence of measurement error and non response under stratified random sampling

J. Shabbir, Erum Zahid, 2018, PloS one.

Estimation of population mean based on dual use of auxiliary information in non response

J. Shabbir, Sat Gupta, Mazhar Yaqub, 2017 .

Estimation of finite population mean in simple and stratified random sampling using two auxiliary variables

J. Shabbir, Sat Gupta, 2017 .

Estimation of finite population mean in simple random sampling and stratified random sampling using two auxiliary variables

Javid Shabbir, Alamgir Khalil, J. Shabbir, 2017 .

Spatial Prediction and Optimized Sampling Design for Sodium Concentration in Groundwater

J. Shabbir, G. Spöck, I. Hussain, 2016, PloS one.

Generalized Systematic Sampling

Javid Shabbir, Sat Gupta, Zaheen Khan, 2015, Commun. Stat. Simul. Comput..

Improved Mean Estimation of a Sensitive Variable Using Auxiliary Information in Stratified Sampling

J. Shabbir, Sat Gupta, Rita Sousa, 2014 .

A Class of Estimators for Finite Population Mean in Double Sampling under Nonresponse Using Fractional Raw Moments

Zawar Hussain, Javid Shabbir, Manzoor Khan, 2014, J. Appl. Math..

Estimation of Finite Population Mean in Multivariate Stratified Sampling under Cost Function Using Goal Programming

Zawar Hussain, Javid Shabbir, Bander Al-Zahrani, 2014, J. Appl. Math..

SOME MODIFIED EXPONENTIAL RATIO-TYPE ESTIMATORS IN THE PRESENCE OF NON-RESPONSE UNDER TWO-PHASE SAMPLING SCHEME

J. Shabbir, Nasir Khan, 2013 .

On improvement in estimating the population mean in simple random sampling

Javid Shabbir, Sat Gupta, J. Shabbir, 2008 .

On estimation of finite population variance

J. Shabbir, Sat Gupta, 2006 .

On improved estimators of K and B in finite population

J. Shabbir, Sat Gupta, 2006 .

Optimal Allocation in Stratified Randomized Response Model

J. Shabbir, Sat Gupta, 2005 .

Hartley-Ross Type Unbiased Estimators Using Ranked Set Sampling and Stratified Ranked Set Sampling

J. Shabbir, Lakhkar Khan, 2016 .

Efficient utilization of two auxiliary variables in stratified double sampling

J. Shabbir, 2018 .

A generalized exponential-type estimator for population mean using auxiliary attributes

J. Shabbir, Muhammad Arslan, Aamna Khan, 2021, PloS one.

Estimation of the finite population mean in two phase sampling when auxiliary variables are attributes

Javid Shabbir, Sat Gupta, J. Shabbir, 2010 .

Improved Exponential Type Estimators of the Mean of a Sensitive Variable in the Presence of Nonsensitive Auxiliary Information

Javid Shabbir, Sat Gupta, Rita Sousa, 2016, Commun. Stat. Simul. Comput..

Estimation of Finite Population Mean Using Optional RRT Models in the Presence of Nonsensitive Auxiliary Information

J. Shabbir, G. Kalucha, B. Dass, 2014 .

Estimation of the Mean of a Sensitive Variable in the Presence of Auxiliary Information

Javid Shabbir, Pedro Corte-Real, Sat Gupta, 2012 .

Mean and sensitivity estimation in optional randomized response models

Sat Gupta, Supriti Sehra, Javid Shabbir, 2010 .

Ratio Estimation of the Mean of a Sensitive Variable in the Presence of Auxiliary Information

J. Shabbir, Sat Gupta, Rita Sousa, 2010 .

SENSITIVITY ESTIMATION FOR PERSONAL INTERVIEW SURVEY QUESTIONS

Sat Gupta, Javid Shabbir, J. Shabbir, 2004 .

Estimation of finite population mean using two auxiliary variables in stratified two-phase sampling

Javid Shabbir, Sat Gupta, J. Shabbir, 2017, Commun. Stat. Simul. Comput..

On Estimating Finite Population Mean in Simple and Stratified Random Sampling

J. Shabbir, Sat Gupta, 2010 .

Circular versions of systematic sampling in the presence of linear trend

Javid Shabbir, Sat Gupta, Zaheen Khan, 2018, Commun. Stat. Simul. Comput..

Some remarks on the traditional way of circular and diagonal circular systematic sampling schemes

Javid Shabbir, Zaheen Khan, J. Shabbir, 2016 .

A comparative survey for assessing Rashidabad city hospitals quality with District Headquarter Hospital.

J. Shabbir, A. Khan, A. Nazuk, 2018, JPMA. The Journal of the Pakistan Medical Association.

Multivariate ratio exponential estimators of the population mean under stratified double sampling

J. Shabbir, A. Khalil, Siraj Muneer, 2022, Mathematical Population Studies.

An efficient new scrambled response model for estimating sensitive population mean in successive sampling

J. Shabbir, Ghulam Narjis, 2021, Communications in Statistics - Simulation and Computation.

On Modified Successive Sampling Based Control Charting Schemes

Muhammad Riaz, Nasir Abbas, Javid Shabbir, 2016, Qual. Reliab. Eng. Int..

Enhanced Estimation of the Population Mean Using Two Auxiliary Variables under Probability Proportional to Size Sampling

J. Shabbir, Erum Zahid, Sohaib Ahmad, 2023, Mathematical Problems in Engineering.

On the use of transformed auxiliary variables in estimating population mean by using two auxiliary variables

Javid Shabbir, Sat Gupta, J. Shabbir, 2007 .

Improved Ratio Estimators in Stratified Sampling

J. Shabbir, Sat Gupta, 2005 .

On use of randomized response technique for estimating sensitive subpopulation total

Javid Shabbir, Shakeel Ahmed, J. Shabbir, 2021, Communications in Statistics - Theory and Methods.

Estimation of population proportion and sensitivity level using optional unrelated question randomized response techniques

Javid Shabbir, Ghulam Narjis, J. Shabbir, 2020, Commun. Stat. Simul. Comput..

On Using Negative Binomial Distribution as a Randomization Device in Sensitive Surveys

Zawar Hussain, Bander Al-Zahrani, Javid Shabbir, 2016, Commun. Stat. Simul. Comput..

An Improved Generalized Difference-Cum-Ratio-Type Estimator for the Population Variance in Two-Phase Sampling Using Two Auxiliary Variables

Javid Shabbir, Sat Gupta, J. Shabbir, 2014, Commun. Stat. Simul. Comput..

An efficient partial randomized response model for estimating a rare sensitive attribute using Poisson distribution

J. Shabbir, Ghulam Narjis, 2019, Communications in Statistics - Theory and Methods.

An introduction to statistical learning with applications in R

Fariha Sohil, Muhammad Umair Sohali, J. Shabbir, 2021, Statistical Theory and Related Fields.

Bayesian Estimation of 3-Component Mixture of the Inverse Weibull Distributions

J. Shabbir, M. Aslam, Tabasam Sultana, 2017, Iranian Journal of Science and Technology, Transactions A: Science.

IMPUTATION OF MISSING VALUES BY USING RAW MOMENTS

Fariha Sohil, J. Shabbir, M. Sohail, 2019, Statistics in Transition New Series.

A new improved generalized class of estimators for population distribution function using auxiliary variable under simple random sampling

J. Shabbir, Erum Zahid, H. Alshanbari, 2023, Scientific Reports.

Comparative study of different imputation methods

Javid Shabbir, Muhammad Umair Sohail, Fariha Sohil, 2021, Communications in Statistics - Simulation and Computation.

Preoperative axillary staging in breast cancer-saving time and resources.

J. Shabbir, T. Reynolds, T. Bucknall, 2008 .

An alternative to Ryu et al. randomized response model

Zawar Hussain, Javid Shabbir, Sat Gupta, 2007 .

Ratio-Type Estimator for Estimating the Neutrosophic Population Mean in Simple Random Sampling under Intuitionistic Fuzzy Cost Function

J. Shabbir, Atta Ullah, Abdullah Alomair, 2023, Axioms.

Bayesian Analysis of the Mixture of Frechet Distribution under Different Loss Functions

J. Shabbir, M. Aslam, Tabasam Sultana, 2017 .

Use of an efficient unbiased estimator for finite population mean

J. Shabbir, Rodney Onyango, 2022, PloS one.

A Class of Hartley-Ross-Type Estimators for Population Mean in Adaptive and Stratified Adaptive Cluster Sampling

J. Shabbir, F. Younis, 2019 .

A new systematic ranked set-sampling scheme for symmetric distributions

J. Shabbir, U. Khalil, Lakhkar Khan, 2019, Life Cycle Reliability and Safety Engineering.

A Class of Hartley-Ross-Type Estimators for Population Mean in Adaptive and Stratified Adaptive Cluster Sampling

J. Shabbir, F. Younis, 2018, Iranian Journal of Science and Technology, Transactions A: Science.

HARTLEY-ROSS UNBIASED ESTIMATOR OF POPULATION MEAN IN RANKED SET SAMPLING USING TWO AUXILIARY VARIABLES

J. Shabbir, Lakhkar Khan, 2017 .

A class of Hartley-Ross type unbiased estimators for population mean using ranked set sampling

J. Shabbir, Lakhkar Khan, 2015 .

Cyclic Polygonal Designs with Block Size 3 and λ = 1 for Joint Distance α = 6 to 16

M. H. Tahir, J. Shabbir, I. Iqbal, 2010 .

Generalized polygonal designs with block size 3 and λ = 1

M. H. Tahir, Javid Shabbir, Munir Akhtar, 2009 .

Estimation of small area total with randomized data.

J. Shabbir, F. Coolen, Sat Gupta, 2020 .

Improved Estimation of Finite Population Variance Using Dual Supplementary Information under Stratified Random Sampling

J. Shabbir, Erum Zahid, S. Hussain, 2022, Mathematical Problems in Engineering.

Optimal calibrated weights while minimizing a variance function

Javid Shabbir, Sarjinder Singh, Shameem Alam, 2021, Communications in Statistics - Theory and Methods.

Generalized Family of Exponential type Estimators for the Estimation of Population Coefficient of Variation

J. Shabbir, Mustansar Aatizaz, Ghazifa Azhar, 2022, STATISTICS, COMPUTING AND INTERDISCIPLINARY RESEARCH.

Optimum second call imputation in PPS sampling

Fariha Sohil, J. Shabbir, M. U. Sohail, 2022, PloS one.

An optimal systematic sampling scheme

J. Shabbir, A. Shamim, Sat Gupta, 2020 .

A new improved difference-cum-exponential ratio type estimator in systematic sampling two auxiliary variables

J. Shabbir, S. Masood, Sat Gupta, 2020 .

Homogeneous Imputation under Two Phase Probability Proportional to Size Sampling

J. Shabbir, M. U. Sohail, Cem Kadilar, 2019 .

A new improved ratio-product type exponential estimator of finite population variance using auxiliary information

Javid Shabbir, Alamgir Khalil, Ghulam Narjis, 2018, Journal of Statistical Computation and Simulation.

A class of ratio type estimators for imputing the missing values under rank set sampling

J. Shabbir, Shakeel Ahmed, M. U. Sohail, 2018 .

Estimation of population coefficient of variation in simple and stratified random sampling under two-phase sampling scheme when using two auxiliary variables

Javid Shabbir, Sat Gupta, J. Shabbir, 2017 .

On generalized exponential chain ratio estimators under stratified two-phase random sampling

J. Shabbir, Sat Gupta, 2017 .

Improved Family of Estimators of Population Variance in Simple Random Sampling

Cem Kadilar, Javid Shabbir, Sat Gupta, 2015 .

Estimation of Finite Population Mean in Stratified Random Sampling with Two Auxiliary Variables under Double Sampling Design

J. Shabbir, Sat Gupta, 2015 .

Modified systematic sampling in the presence of linear trend

J. Shabbir, Zaheen Khan, 2014 .

A RatioType Estimator for the Estimation of Population Variance using Quartiles of an Auxiliary Variable

Javid Shabbir, Mursala Khan, J. Shabbir, 2013 .

Estimation of Finite Population Mean in Stratified Random Sampling Using Auxiliary Attribute (s) und

J. Shabbir, A. Sagir, 2012 .

Improvement Over Transformed Auxiliary Variable in Estimating the Finite Population Mean

J. Shabbir, M. Z. Yaab, 2003 .

IMPROVED EXPONENTIAL RATIO TYPE ESTIMATORS IN STRATIFIED SAMPLING

J. Shabbir, A. Haq, Sat Gupta, 2013 .

A family of ratio estimators for population mean in extreme ranked set sampling using two auxiliary variables

Abdul Haq, Javid Shabbir, J. Shabbir, 2010 .

An Improved Two-stage Randomized Response Model for Estimating the Proportion of Sensitive Attribute

Javid Shabbir, Ghulam Narjis, J. Shabbir, 2021, Sociological Methods & Research.

On Bayesian Analysis of a General Class of Randomized Response Models In Social Surveys about Stigmatized Traits

J. Shabbir, Z. Hussain, M. Abid, 2021 .

On the estimation of a sensitive quantitative mean using blank cards

Zawar Hussain, Javid Shabbir, Fatima Batool, 2017 .

Estimation of the mean of a socially undesirable characteristic

Zawar Hussain, Javid Shabbir, J. Shabbir, 2013 .

An Efficient Class of Repeated Measurements Designs to Control the Residual Effects Using Periods of Three Different Sizes

J. Shabbir, R. Ahmed, Abid Khan, 2023 .

A parent-generalized family of chain ratio exponential estimators in stratified random sampling using supplementary variables

J. Shabbir, A. Khalil, Siraj Muneer, 2020, Commun. Stat. Simul. Comput..

A general class of estimators for the population mean using multi-phase sampling with the non-respondents

J. Shabbir, G. Diana, S. Riaz, 2014 .

On Optimum Regression Estimator for Population Mean Using Two Auxiliary Variables in Simple Random Sampling

Javid Shabbir, Wajid Hussain Awan, J. Shabbir, 2014, Commun. Stat. Simul. Comput..