ภาควิชาสถิติประยุกต์ คณะวิทยาศาสตร์ประยุกต์ มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าพระนครเหนือ

ผลงานวิจัยที่ตีพิมพ์ในวารสารนานาชาติ ปีงบประมาณ 2563

1. Thangjai, W., Niwitpong, SA. and Niwitpong, S. (2021). “A Bayesian approach for estimation of
   coefficients of variation of normal distributions.” Sains Malaysiana. Vol.50 No.1 : 261-278.
   (Indexed by SCIE: Q4)
2. Maneerat, P., Niwitpong, SA. (2021). [serial online]. “Estimating the average daily rainfall in
   Thailand using confidence intervals for the common mean of several delta-lognormal
   distributions.” PeerJ. Vol.9 No.271 : e10758. (Indexed by SCIE: Q2)
3. Maneerat, P., Niwitpong, S. and Niwitpong, SA. (2021). “Bayesian confidence intervals for
   variance of delta-lognormal distribution with an application to rainfall dispersion.” Statistics
   and its Interface. Vol.14 No.3 : 229-241. (Indexed by SCIE: Q4)
4. Chankham, W., Niwitpong, SA. and Niwitpong, S. (2020). “Confidence intervals for the
   difference between the coefficients of variation of inverse Guassian distributions.” In : Huynh,
   V.N., Entani, T., Jeenanunta, C., Inuiguchi, M. and Yenradee, P. (eds). Integrated Uncertainty in
   Knowledge Modelling and Decision Making. IUKM 2020. Lecture Notes in Computer Science.
   Vol.12482. Springer, Cham.
5. Kaewprasert, T., Niwitpong, SA. and Niwitpong, S. (2020). “Confidence interval for coefficient
   of variation of inverse gamma distribution.” In : Huynh, V.N., Entani, T., Jeenanunta,
   C., Inuiguchi, M. and Yenradee, P. (eds). Integrated Uncertainty in Knowledge Modelling and
   Decision Making. IUKM 2020. Lecture Notes in Computer Science. Vol.12482. Springer, Cham.
6. Thangjai, W., Niwitpong, SA. and Niwitpong, S. (2020). “Bayesian confidence intervals for
   means of normal distributions with unknown coefficients of variation.” In : Huynh, V.N.,
   Entani, T., Jeenanunta, C., Inuiguchi, M. and Yenradee, P. (eds). Integrated Uncertainty in
   Knowledge Modelling and Decision Making. IUKM 2020. Lecture Notes in Computer Science.
   Vol.12482. Springer, Cham.
7. Puggard, W., Niwitpong, SA. and Niwitpong, S. (2020). “Generalized confidence interval of the
   ratio of coefficients of variation of Birnbaum-Saunders distribution.” In : Huynh, V.N., Entani,
   T., Jeenanunta, C., Inuiguchi, M. and Yenradee, P. (eds). Integrated Uncertainty in Knowledge
   Modelling and Decision Making. IUKM 2020. Lecture Notes in Computer Science. Vol.12482.
   Springer, Cham.
8. Junnumtuam, S., Niwitpong, SA. and Niwitpong, S. (2020). “The Bayesian confidence interval
   for the mean of the zero-inflated poisson distribution.” In : Huynh, V.N., Entani, T.,
   Jeenanunta, C., Inuiguchi, M. and Yenradee, P. (eds). Integrated Uncertainty in Knowledge
   Modelling and Decision Making. IUKM 2020. Lecture Notes in Computer Science. Vol.12482.
   Springer, Cham.
9. Maneerat, P., Niwitpong, SA. and Nakjai, P. (2020). “Estimating fish dispersal using interval
   estimations for the single variance of a delta-lognormal distribution.” In : Huynh, V.N., Entani,
   T., Jeenanunta, C., Inuiguchi, M. and Yenradee, P. (eds). Integrated Uncertainty in Knowledge
   Modelling and Decision Making. IUKM 2020. Lecture Notes in Computer Science. Vol.12482.
   Springer, Cham.
10. Thangjai, W., Niwitpong, SA. and Niwitpong, S. (2020). [serial online]. “Distributed under
    creative commons CC-BY 4.0 confidence intervals for the common coefficient of variation of
    rainfall in Thailand.” PeerJ. 8 : e10004. (Indexed by SCIE: Q2)

ผลงานวิจัยที่ตีพิมพ์ในวารสารนานาชาติ ปีงบประมาณ 2564

1. Chankham W, Niwitpong S, Niwitpong S. (2022) “Measurement of dispersion of PM 2.5 in
   Thailand using confidence intervals for the coefficient of variation of an inverse Gaussian
   distribution.” PeerJ 10:e12988 (Indexed by SCIE: Q2)
2. Yosboonruang N, Niwitpong S-A, Niwitpong S. (2022) “Bayesian computation for the common coefficient of variation of delta-lognormal distributions with application to common rainfall dispersion in Thailand.” PeerJ 10:e12858 (Indexed by SCIE: Q2)
3. Thangjai, W., Niwitpong, S. and Niwitpong, S. (2022). “Simultaneous confidence intervals
   for all differences of coefficients of variation of normal distributions with an application
   to PM2.5 dispersion.” Thailand Statistician. 2 (1): 207 – 226. (Indexed by Scopus: Q4)
4. Thangjai, W. and Niwitpong, S. (2022). “The relative potency of two drugs using the
   confidence interval for ratio of means of two normal populations with unknown
   coefficients of variation.” Journal of Statistics Applications and Probability. 11 (1): 1 -14.
   (Indexed by Scopus: Q3)
5. Maneerat, P. and Niwitpong, S. (2021). “Multiple comparisons of precipitation variations
   in different areas using simultaneous confidence intervals for all possible ratios of
   variances of several zero-inflated lognormal models.” PeerJ. 9: e12659. (Indexed by SCIE: Q2)
6. Puggard, W., Niwitpong, S. and Niwitpong, S. (2021). “Bayesian Estimation for the
   coefficients of variation of Birnbaum-Saunders distributions.” Symmetry. 13 (2130): 1 –
   15. (Indexed by SCIE: Q2)
7. Maneerat, P., Niwitpong, S. and Niwitpong, S. (2021). “Simultaneous confidence intervals
   for all pairwise comparisons of the means of delta-lognormal distributions with
   application to rainfall data.” PLoS ONE. 16 (7): e0253935. (Indexed by SCIE: Q2)
8. La-ongkaew, M., Niwitpong, S. and Niwitpong, S. (2021). “Confidence intervals for the
   difference between the coefficients of variation of Weibull distributions for analyzing
   wind speed dispersion.” PeerJ. 9 (8): e11676. (Indexed by SCIE: Q2)
9. Yosboonruang, N., Niwitpong, S. and Niwitpong, S. (2021). “Simultaneous confidence
   intervals for all pairwise differences between the coefficients of variation of rainfall
   series in Thailand.” PeerJ. 9: e11651. (Indexed by SCIE: Q2)
10. Yosboonruang, N., Niwitpong, S (2021). “Confidence intervals for the coefficient of quartile variation of a zero-inflated lognormal distribution.” Emerging Science Journal. 5: 457 – 470. (Indexed by Scopus: Q1)
11. Junnumtuam, S., Niwitpong, S. and Niwitpong, S. (2021). “The Bayesian confidence
    interval for coefficient of variation of zero-inflated Poisson distribution with application to daily COVID-19 deaths in Thailand.” Emerging Science Journal. 5: 62 – 76. (Indexed by Scopus: Q1)
12. Thangjai, W., Niwitpong, S. and Niwitpong, S. (2021). “Bayesian confidence intervals for
    coefficients of variation of PM10 dispersion.” Emerging Science Journal. 5 (2): 139 – 154.
    23 (Indexed by Scopus: Q1)

ผลงานวิจัยที่ตีพิมพ์ในวารสารนานาชาติ ปีงบประมาณ 2565

1. Puggard, W., Niwitpong, S. and Niwitpong, S. (2022). “Simultaneous confidence intervals for all pairwise differences between the coefficients of variation of multiple Birnbaum-Saunders distributions.” Symmetry. 14: 2666. (Indexed by SCIE: Q2)
2. Kaewprasert, T., Niwitpong, S. and Niwitpong, S. (2022). “Simultaneous confidence intervals for the ratios of the means of zero-inflated gamma distributions and its application.” Mathematics, 10: 4724. (Indexed by SCIE: Q1)
3. Thangjai, W., Niwitpong, S. and Niwitpong, S. (2022). “Estimation of common percentile of rainfall datasets in Thailand using delta-lognormal distributions.” PeerJ. 10: e14498. (Indexed by SCIE: Q2)
4. Khooriphan, W., Niwitpong, S. and Niwitpong, S. (2022). “Confidence intervals for the ratio of variances of delta-gamma distributions with applications.” Axioms. 11: 689. (Indexed by SCIE: Q2)
5. Junnumtaum, S., Niwitpong, S. and Niwitpong, S. (2022). “A zero-and-one inflated cosine geometric distribution and its application.” Mathematics. 10: 4012. (Indexed by SCIE: Q1)
6. Puggard, W., Niwitpong, S. and Niwitpong, S. (2022). “Confidence intervals for common coefficient of variation of several Birnbaum-Saunders distributions.” Symmetry. 14: 2101. (Indexed by SCIE: Q2)
7. Khooriphan, W., Niwitpong, S. and Niwitpong, S. (2022). “Bayesian estimation of rainfall dispersion in Thailand using gamma distribution with excess zeros.” PeerJ. 10: e14023. (Indexed by SCIE: Q2)
8. Puggard, W., Niwitpong, S. and Niwitpong, S. (2022). “Comparison Analysis on the coefficients of variation of two independent Birnbaum-Saunders distributions by constructing confidence intervals for the ratio of coefficients of variation.” Sains Malaysiana. 51(7): 2265-2281. (Indexed by SCIE: Q4)
9. Puggard, W., Niwitpong, S. and Niwitpong, S. (2022). “Confidence intervals for comparing the variances of two independent Birnbaum-Saunders distributions.” Symmetry. 14: 1492. (Indexed by SCIE: Q2)
10. Kaewprasert, T., Niwitpong, S. and Niwitpong, S. (2022). “Bayesian estimation for the mean of delta-gamma distributions with application to rainfall data in Thailand.” PeerJ. 10: e13465. (Indexed by SCIE: Q2)
11. Thangjai, W., Niwitpong, S. and Niwitpong, S. (2022). “Bayesian confidence interval for ratio of the coefficients of variation of normal distributions: A practical approach in Civil Engineering.” 7: 135-147. (Indexed by Scopus: Q1)
12. Puggard, W., Niwitpong, S. and Niwitpong, S. (2022). “Confidence intervals for the variance and difference of variances of Birnbaum-Saunders distributions.” Journal of Statistical Computation and Simulation. 92(13): 2829-2845. (Indexed by SCIE: Q3)
13. Yosboonruang, N., Niwitpong, S. and Niwitpong, S. (2022). “Confidence intervals for rainfall dispersions using the ratio of two coefficients of variation of lognormal distributions with excess zeros.” PLoS ONE. 17(3): e0265875. (Indexed by SCIE: Q2)
14. Yosboonruang, N., Niwitpong, S. and Niwitpong, S. (2022). “Bayesian computation for the common coefficient of variation of delta-lognormal distributions with application to common rainfall dispersion in Thailand.” PeerJ. 10: e12858. (Indexed by SCIE: Q2)
15. Maneerat, P., Nakjai, P. and Niwitpong, SA. (2022). “Estimation methods for the ratio of medians of three-parameter lognormal distributions containing zero values and their application to wind speed data from northern Thailand.” PeerJ. 10: 10, e14194. (Indexed in SCIE: Q2, IF 2.98)
16. Maneerat, P., Nakjai, P. and Niwitpong, SA. (2022). “Bayesian interval estimations for the mean of delta-three parameter lognormal distribution with application to heavy rainfall data.” PLoS ONE 17(4): e0266455. (Indexed in SCIE: Q2, IF 2.98)
17. Maneerat, P., Niwitpong, SA. and Nakjai, P. (2022). “Estimating Wind Speed by Using Confidence Intervals for the Median in a Three-Parameter Lognormal Model.” Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) Volume 13199 LNAI, Pages 329 – 3412022. (Scopus: Q2)
18. Thangjai, W., Niwitpong, S. and Niwitpong, S. (2022). “Analysis of Medical Data Using Interval Estimators for Common Mean of Gaussian Distributions with Unknown Coefficients of Variation.” Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) Volume 13199 LNAI, Pages 155 – 166. (Scopus: Q2)

ผลงานวิจัยที่ตีพิมพ์ในวารสารนานาชาติ ปีงบประมาณ 2566

1. Yosboonruang, N., Niwitpong, S.-A.(2023) “Bayesian Estimation for the Difference between Coefficients of Quartile Variation of Delta-Lognormal Distributions: An Application to Rainfall in Thailand.” Symmetry 15(7): 1383. (Indexed by SCIE: Q2)
2. Thangjai, W., Niwitpong, S.-A. (2023) “Confidence Intervals for Mean and Difference between Means of Delta-Lognormal Distributions Based on Left-Censored Data.” Symmetry 15(6): 1216. (Indexed by SCIE: Q2)
3. Khooriphan, W., Niwitpong, S.-A., Niwitpong, S. (2023) “Confidence Interval for the Difference Between Variances of Delta-Gamma Distribution.” Applied Science and Engineering Progress 16(4), 6509. (Indexed by Scopus Q2)
4. La-Ongkaew, M., Niwitpong, S.-A., Niwitpong, S.(2023) “Estimating average wind speed in
   5. Thailand using confidence intervals for common mean of several Weibull distributions.”
   PeerJ 11: 15513. (Indexed by SCIE: Q2)
5. Thangjai, W., Niwitpong, S.-A., Niwitpong, S., Smithpreecha, N. (2023) “Confidence Interval Estimation for the Ratio of the Percentiles of Two Delta-Lognormal Distributions with Application to Rainfall Data.” Symmetry 15(4): 794. (Indexed by SCIE: Q2)
6. La-ongkaew, M., Niwitpong, S.-A., Niwitpong, S. (2023) “Estimation of the Confidence Interval for the Ratio of the Coefficients of Variation of Two Weibull Distributions and Its Application to Wind Speed Data.” Symmetry 15(1): 46. (Indexed by SCIE: Q2)
7. Kaewprasert, T., Niwitpong, S.-A.Niwitpong, S. (2023) “Confidence Intervals for the Ratio of the Coefficients of Variation of Inverse-Gamma Distributions.” Applied Science and Engineering Progress 16(1): 5660. (Indexed by Scopus Q2)
8. Junnumtuam, S., Niwitpong, S.-A., Niwitpong, S. (2023) “Bayesian Computation for the Parameters of a Zero-Inflated Cosine Geometric Distribution with Application to COVID-19 Pandemic Data.” CMES – Computer Modeling in Engineering and Sciences 135(2): 1229–1254. (Indexed by SCIE: Q3)

ทุนวิจัยที่ได้รับ ปีงบประมาณ 2564

1. ทุนงบประมาณด้านวิทยาศาสตร์ วิจัยและนวัตกรรมกลุ่ม Basic Research Fund ปีงบประมาณ 2564
   เรื่อง ช่วงความเชื่อมั่นพร้อมกันสำหรับผลต่างค่าเฉลี่ยของการแจกแจงเดลต้าล็อกนอร์มอล
2. ทุนสนับสนุนทุนวิจัยคณะวิทยาศาสตร์ประยุกต์ ประจำปี 2564 เรื่องช่วงความเชื่อมั่นร่วมสำหรับซิกนอล
   ทูนอยส์เรโชของการแจกแจงแบบเลขชี้กำลังแบบสองพารามิเตอร์

ทุนวิจัยที่ได้รับ ปีงบประมาณ 2565

1. ทุนงบประมาณด้านวิทยาศาสตร์ วิจัยและนวัตกรรมกลุ่ม Basic Research Fund ปีงบประมาณ 2565 เรื่อง แก่ผู้รับทุน เพื่อทำการวิจัย เรื่อง การประมาณค่าของพารามิเตอร์ของการแจกแจงเบิร์นบัม-แซนเดอร์ ได้ผลิตบุคคลากรระดับศึกษาปริญญาเอกสาขาสถิติประยุกต์ คือ ดร. ม ปัจจุบันเป็นอาจารย์มหาวิทยาลัยเชียงใหม่
2. ทุนงบประมาณวิทยาศาสตร์ประยุกต์ประจำปี 2565 เรื่องช่วงความเชื่อมั่นสำหรับค่าเฉลี่ยร่วมของการ
   แจก แจง Gaussian เมื่อไม่ทราบสัมประสิทธิ์การแปรผัน

ทุนวิจัยที่ได้รับ ปีงบประมาณ 2566

1. ทุนงบประมาณวิทยาศาสตร์ประยุกต์ประจำปี 2566 เรื่องช่วงความเชื่อมั่นสำหรับมัธยฐานของ
   การแจกแจงเดลต้าล็อกนอร์มอล
2. ทุนงบประมาณด้านวิทยาศาสตร์ วิจัยและนวัตกรรมกลุ่ม Basic Research Fund ปีงบประมาณ 2566 เพื่อทำการวิจัย เรื่อง สถิติอนุมานค่าสำหรับค่าเฉลี่ยของการแจกแจงเดลต้าแกมมา
   ได้ผลิตบุคคลากรระดับศึกษาปริญญาเอกสาขาสถิติประยุกต์ คือ ดร.ธีรพงษ์ แก้วประเสริฐ

บริการวิชาการตั้งแต่ปีการศึกษา 2563-2565

1. วิทยากร 
2. ผู้ทรงคุณวุฒิพิจารณาโครงการวิจัย
   2.1 คณะกรรมการพิจารณาโครงการวิจัยของมหาวิทยาลัยนเรศวร มหาวิทยาลัยมหาสารคาม
3. ผู้ทรงคุณวุฒิพิจารณาบทความวิจัย
   3.1 Reviewer ของวารสาร Thailand Statistician
   3.2 Reviewer ของวาสาร Communications in Statistics-Simulation and Computation
   3.3 Review ของวารสาร Communications in Statistics-Theory and Methods
   3.4 Reviewer ของวารสาร Journal of Statistical Simulation and Computation
   3.5 Reviewer ของวารสาร Journal of Applied Statistics
   3.6 Reviewer ของวารสาร Annals of Operations Research
   3.7 Reviewer ของวารสาร International Journal of Uncertainty Fuzziness and Knowledge-
   Based Systems.
   3.8. Reviewer ของวารสาร Soft Computing, Axioms, Symmetry, Mathematics, Stats,
   Applied Science
   3.9 Reviewer ของวารสาร KMUTNB และอื่นๆ