Production Statistics Methodology
The Production Statistics Report provides
information on the volume and value of a specially selected list of items of
production.This information is
compiled from data collected mainly from large establishments in the
Agriculture, Mining and Manufacturing industries. Large establishments employ 50
or more persons. Data is also collected from one utility company, the Jamaica
Public Service Company, which is mainly responsible for the production of
electricity for Jamaica.
Data on agricultural production are obtained from
the Ministry of Agriculture as well as from the administrative records of
agricultural commodity boards. Bauxite mining information is obtained from The
Jamaica Bauxite Institute. All other information is compiled from data collected
in the Quarterly Production Surveys undertaken by STATIN.
The sample for the quarterly production survey is drawn from STATIN’s Central
Register of Establishments. All establishments employing 50 or more persons are
included in the sample. A 20 per cent sample of establishments employing 10 – 49
persons makes up the rest of the sample, unless some product groups do not have
an adequate number of establishments. In such a situation all establishments
become a part of the sample. Establishments with less than 10 employees are not
included in the sample. Data are collected on goods produced: unit of quantity;
unit price; volume and value at ex-factory price.
When completed questionnaires are received, they
are scrutinized for accuracy and consistency.
The data is then entered into worksheets where the quarterly estimates
are calculated.Production data for
a particular product is considered ‘not available’ if data is missing for two or
more quarters. If only one quarter is missing, the fourth quarter is imputed by
calculating the average for the three available quarters.This figure is designated with an
asterisk in the publication report.
If the data becomes available after the deadline for the publication of the
report, the current figure is revised and included in the following year’s