I.    Introduction

The Seasonally Adjusted Value of Production in Agriculture and Fisheries presents the accomplishments of agriculture and fisheries during a particular reference period without the effects of seasonal factors. It covers all agriculture and fishery commodities, highlighting 22 commodities for crops, nine commodities for livestock and poultry, and 20 commodities for fisheries.

By removing the seasonal component from the series, seasonal adjustment reveals the true movement or behavior, enabling comparisons across time periods.

II.    Data Collection

The generation of the original series on the Value of Production in Agriculture and Fisheries requires data on volume of production and farmgate prices. These data are sourced from the following PSA surveys and administrative-based records from other government agencies:

III.    Methodology

The Seasonal Adjustment of the Value of Production in Agriculture and Fisheries uses the internationally recommended seasonal adjustment method which is the X-13 Auto-Regressive Integrated Moving Average (ARIMA) of JDemetra+.

The Seasonally Adjusted Value of Production in Agriculture and Fisheries is generated using Indirect Approach, or by seasonally adjusting the following: 22 highlighted commodities for crops and other crops; nine commodities for livestock and poultry; and 20 commodities for fisheries and other fisheries. Thereafter, the seasonally adjusted components are being added to produce the indirect seasonal adjustment aggregates.

To ensure the quality of generated seasonally adjusted estimates, Quality Statistic (Q-statistic) is measured for each adjusted series.
 

IV.    Concepts and Definition of Terms

Value of Production at Constant Prices refers to the valuation of transactions, wherein the influence of price changes from the base year to the current year has been removed.

Seasonality (seasonal component) is a regular fluctuation with similar patterns and magnitude that repeatedly occur within a calendar year and normally observed for high frequency data such as monthly and quarterly series. (Seasonally Adjusted National Accounts: Sources and Methods, 2023)

Seasonal Adjustment is a statistical technique to remove the effects of seasonal influences operating on a time series. (Seasonally Adjusted National Accounts: Sources and Methods, 2023)
 

V.    Dissemination of Results

The Special Release on the Seasonally Adjusted Value of Production in Philippine Agriculture and Fisheries is being released quarterly in the PSA website.  

The Special Release on the Seasonally Adjusted Value of Production in Agriculture and Fisheries is being released quarterly in the PSA website.  

Special release, statistical tables, and infographics are included in the web release.

VI.    Citation

Philippine Statistics Authority. (2024). Technical Notes on Seasonally Adjusted Value of Production in Philippine Agriculture and Fisheries. https://psa.gov.ph/node/1684063693

VII.    Contact Information

Ms. Maria Clarinda E. De Guzman
(Senior Statistical Specialist)
Officer-in-Charge
Agricultural Accounts Division
(02) 8376-1954
c.deguzman@psa.gov.ph

For data request, you may contact:
Knowledge Management and Communications Division
(02) 8462-6600 loc. 820
info@psa.gov.ph | kmcd.staff@psa.gov.ph