Browsing by Author "De Mel, W.A.R."

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ARIMA-Neural Hybrid Estimates of Inflationary Expectations: Some Evidence from Sri Lanka

Bandara, W.M.S.; De Mel, W.A.R. (University of Ruhuna, Matara, Sri Lanka, 2023-06-07)

In traditional time series forecasting problems, researchers mostly used classical time series models, such as, Autoregressive (AR), Moving average (MA) and ARIMA to model linear time series data. On the other hand, ...
Forecasting Inflation Rate in Sri Lanka Using Supervised Machine Learning Techniques

Bandara, W.M.S.; De Mel, W.A.R. (University of Ruhuna, 2021-03-03)
Investigating the influence functions of Cumulative Hazard and Kaplan-Meier estimators for survival data

Thilakarathne, K.P.A.I.; De Mel, W.A.R. (Faculty of Science, University of Ruhuna, Matara, Sri Lanka, 2024-01-24)

In this study, we considered the right-censored data {(𝑍1,𝛿1),(𝑍2,𝛿2),...,(𝑍𝑛,𝛿𝑛)}, where 𝑍𝑖 = 𝑚𝑖𝑛(𝑋𝑖,𝑌𝑖) and 𝛿𝑖= 𝐼(𝑍𝑖=𝑋𝑖). Let 𝑋1,𝑋2,...,𝑋𝑛 be a random sample from an absolutely parametric ...
Parameter estimation in eurvival distribution by using Expectation Maximization (EM) algorithm

Lakmini, R.M.V.; De Mel, W.A.R. (Faculty of Science, University of Ruhuna, Matara, Sri Lanka, 2024-01-24)

For ages, actuaries, medical officers, and governments have used survival analysis to estimate life expectancies, medical treatment effectiveness, insurance premiums, and annuities. Censored data, the motivating factor for ...

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