Technical Notes

I. Introduction

The Monthly Integrated Survey of Selected Industries (MISSI) is one of the designated statistical activities undertaken by the Philippine Statistics Authority with the objective of providing flash indicators on the performance of growth-oriented industries in the manufacturing sector. The survey gathers monthly data on employment, compensation, production, net sales, inventories, and capacity utilization from manufacturing establishments.

The indicators generated from the MISSI are Value of Production Index (VaPI), Volume of Production Index (VoPI), Value of Net Sales Index (VaNSI), Volume of Net Sales Index (VoNSI), and Average Capacity Utilization Rate of the manufacturing sector.

Rebasing

Starting with the January 2021 reference month, production and sales indices from the MISSI are rebased to 2018, from 2000 base period. 

The major changes in the rebasing are (1) the industry structure or classification and (2) the weights which measure the relevance of the industries. The industry classification for the 2018-based series follows the 2009 Philippine Standard Industry Classification (PSIC), while the 2000-based series adopted the 1994 PSIC. For the rebased series, the weights at the base year were computed based on the final results of the 2018 Census of Philippine Business and Industry (CPBI). The results of the Annual Survey of Philippine Business and Industry will be used to update the weights annually until the next rebasing.

Another changes are on the methodology of index computation and on the estimation of average capacity utilization rate which are discussed in the next section.

II. Method of Index Computation

The VaPI and VaNSI utilize the Paasche-type method of index computation where the basic data of weight computation are the value of production and sales, respectively. The sources of these data are the CPBI for the base year and the Annual Survey of Philippine Business and Industry (ASPBI) for the succeeding years until the next rebasing.

  1. Weights Computation

The weight of the industry group is the percent share of the industry to the total value of production for the industry division. The sum of the weights of all industry groups within an industry division is equal to 1.

The weight of the industry division is the percent share of the industry to the total value of production for the manufacturing sector. The sum of the weights of all industry divisions is equal to 1.

The same methodology is used in the computation of the weights for sales, but instead of value of production, data on sales is used.

  1. Index Computation

The formula in the computation of indices are as follows:

  1. Value of Production Index (VaPI)

a. Computation of Index for Industry Group Level

  1. Monthly Index at the base year

  1. Monthly Index after the base year

b. Computation of Index for Industry Division Level

c. Computation of Index for Total Manufacturing

  1. Value of Net Sales Index (VaNSI)

The same methodology as the VaPI is used to compute the Value of Net Sales Index (VaNSI).

  1. Volume of Production Index (VoPI)
    a. Computation for Index for Industry Group Level

b. Computation of Index for Industry Division Level

c. Computation of Index for Total Manufacturing

  1. Volume of Net Sales Index (VoNSI)
    The same methodology as VoPI is used to compute the Volume of Net Sales Index (VoNSI).
  2. Average Capacity Utilization Rate
    Capacity Utilization Rate is the ratio of total output to the maximum rated capacity of the establishment. The formulas in obtaining the Average Capacity Utilization Rate (AveCU) are the following:

a. Computation of AveCU for Industry Group Level

b. Computation of AveCU for Industry Division Level

c. Computation of AveCU for Total Manufacturing

Note:

A link factor has been used to adjust weight effects to measure the correct price change.
 

III. Computation of Growth Rates

Year-on-year growth rates are computed by dividing the current month index by the index in the same month of the previous year less 1.

IV. Imputation and Revision

Imputation is done for sample establishments that are in operation during the reference period but with no response during the release date. Results are revised accordingly when the actual data are received and these revisions are reflected in the next release.

V. Industry Coverage

The MISSI utilizes the 2009 PSIC to classify industry divisions and industry groups. Twenty-two industry divisions of the 2009 PSIC were formed to comprise the industry coverage of the MISSI.

2009 PSIC CODE

INDUSTRY DESCRIPTION

C10

Manufacture of food products*

C11

Manufacture of beverages

C12

Manufacture of tobacco products

C13

Manufacture of textiles

C14

Manufacture of wearing apparel

C15

Manufacture of leather and related products, including footwear

C16

Manufacture of wood, bamboo, cane, rattan articles and related products*  

C17

Manufacture of paper and paper products

C18

Printing and reproduction of recorded media

C19

Manufacture of coke and refined petroleum products

C20

Manufacture of chemical and chemical products*

C21

Manufacture of basic pharmaceutical

products and pharmaceutical preparations

C22

Manufacture of rubber and plastic products*

C23

Manufacture of other non-metallic mineral products*

C24

Manufacture of basic metals*

C25

Manufacture of fabricated metal products, except machinery and equipment*

C26

Manufacture of computer, electronic and optical products*

C27

Manufacture of electrical equipment*

C28

Manufacture of machinery and equipment except electrical*

C29, C30

Manufacture of transport equipment*

C31

Manufacture of furniture

C32, C33

Other manufacturing

* Industry divisions categorized further into industry groups

 

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Contact Us

Technical Inquiries:

Industry Statistics Division
Economic Sector Statistics Service
j.egsan@psa.gov.ph +632 8376 2060/1835

Publication Inquiries:

Knowledge Management and Communications Division;
Information Technology and Dissemination Service
info@psa.gov.ph +632 8462 6600 loc. 834