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Length‐weight Relationships of Seven Cyprinid Fish Species from the Kaptai Lake, Bangladesh

M. A. AWAL
Senior Scientific Office
(Agricultural Economics), On-Farm Research Division, Bangladesh Agricultural Research Institute (BARI), Mymensingh

M.A.B. SIDDIQUE
Senior Scientific Officer
Agricultural Economics Division, Bangladesh Rice Research Institute (BRRI), Gazipur 1701, Bangladesh.

Abstract/ Executive Summary:

The present study was carried out to estimate growth patterns and also examine the best ARIMA model to efficiently forecasting Aus, Aman and Boro rice production in Bangladesh. It appeared that the time series data for Ausand Aman were 1st order homogenous stationary but Boro was 2^nd order stationary. The study revealed that the best models were ARIMA (4,1,4), ARIMA (2,1,1), and ARIMA (2,2,3) for Aus, Aman, and Bororice production, respectively. The analysis indicated that short-term forecasts were more efficient for ARIMA models compared to the deterministic models. The production uncertainty of rice could be minimized if production were forecasted well and necessary steps were taken against losses. The findings of this study would be more useful for policymakers, researchers as well as producers in order to forecast future national rice production more accurately in the short run.

Keywords: Production, ARIMA model, Forecasting of rice.

Location: The Kaptai Lake, Bangladesh

Start Date: 00-00-1972

End Date: 00-00-2008

Program Area: Socio-economic and Policy

Commodity: Fish

Objectives:

The specific objectives of the present study are as follows: i) to estimate the growth pattern of rice production of different seasons in Bangladesh; ii) to develop appropriate ARIMA models for the time series of Aus, Aman, and Boro rice production in Bangladesh; iii) to make five-year forecasts for all the time series with appropriate prediction interval; and compare the forecasting performance of ARIMA and deterministic models.

Methodology:

The present study was conducted mainly based on secondary data. The majority of the information on the time series data of Aus, Aman, and Boro rice production pertaining to the period of 1972-73 to 2007-08 were generated and compiled from published volumes of the Bangladesh Bureau of Statistics (BBS). inferential statistical tools were employed in analyzing the data. In order to forecast the rice production was modeled by Box-Jenkins type stochastic autoregressive integrated moving average (ARIMA) process. The Box-Jenkins type ARIMA process (Box and Jenkins, 1978) can be defined as ø(B) (dyt-μ) = θ(B)εt. Here, yt denotes Aus, Aman, and Boro rice production in million metric tons, μ is the mean of θdYt, ø(B) is 1-ø1B----øpBp, θ(B) is 1-θ1B----θqBq, θdenotes the moving average parameter, ø denotes the autoregressive parameter, p, q, and d denote the autoregressive, moving average and difference orders of the process, respectively, θ and B denote the difference and back-shift operators, respectively. The estimation methodology of the above model consists of three steps, namely identification, estimation of parameters, and diagnostic checking. The identification step involves the use of the techniques for determining the value of p, d, and q. Here, these values are determined by using autocorrelation and partial autocorrelation functions (ACE and PACF) and the Augmented Dickey-Fuller (ADF) test. The model used for ADF is y-yt-1=α+βt+(ρ-1)yt-1+λyt-1(Pindyck and Rubinfeld, 1991, p.461). The second step is to estimate the parameters of the model. Here, the method of maximum likelihood is used for this purpose. The third step is to check whether the chosen model fits the data reasonably well. For this reason, the residuals are examined to find out if they are white noise. To test if residuals are white noise, the ACE of residuals and the Ljung and Box (1978) statistic is used. In case of two or more competing models passing the diagnostic checks, the best model is selected using the criteria multiple R2, Root Mean Squared Error (RMSE), Akaike Information Criterion (AIC), Bayesian Information Criterion (BIC), Mean Absolute Error (MAE), and Mean Absolute Percent Error (MAPE). Nine deterministic types’ growth models are also considered in this study for comprising the forecasting efficiency of stochastic models. The above-mentioned model selection criteria are used to select the best deterministic model forecasting purpose.

Source of Information: Bangladesh J. Agril. Res. 36(1) : 51-62, March 2011 ISSN 0258-7122

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

This study made the best effort to develop a short-run forecasting model of rice production in Bangladesh. The empirical analysis indicated that ARIMA (4,1,1), ARIMA(2,1,1), and ARIMA (2,2,3) were best-fitted models for short-run forecasting of Aus, Aman, and Bororice production, respectively. However, the ARIMA model estimated that the rice production of Bangladesh was 1735, 11056, and 13538 thousand metric tons in 2008-09 and if the trend in present rice production to be continued, the total rice (Aus, Aman, and Boro) production of Bangladesh would be 1591, 11612, and 15541 thousand metric tons in the year 2012-2013. To increase the rice production in Bangladesh, the government should put emphasis on adopting high-yielding rice varieties in three rice seasons and take proper input subsidiary programme in order to achieve food security. The production uncertainty of rice could be minimized if production were forecasted well and necessary steps were taken against losses. For this purpose, the findings of this study would be more useful for policymakers, researchers, and producers for future national rice production policies.

Knowledge Management: Journal