Motivation: Our national source reports quarterly population for Canada and its 13 provinces in not seasonally adjusted (NSA) terms; hence, we create seasonally adjusted (SA) supplements. Previously, we created our seasonal factors using the X-12 ARIMA program, but we are now incrementally migrating all releases to X-13 ARIMA.

Response: For country and provinces, we have recalculated seasonal factors using the X-13 ARIMA program, and have revised seasonal supplements over their full history.

Properties: Properties are otherwise unchanged. Series start as early as 1946Q1 for the nation, and 1951Q3 for Canada's Provinces.

The series reside in the historical catalog:

• Canada » Demographics » Population » Estimates » Total 

Method

Inputs:

1. Provincial VSPOPUQ.ICAN_^^, from 1951Q3
2. National VSQPOPUQ.ICAN, from 1946Q1

Steps:

1. For provinces (input (a)), seasonally adjusted using the U.S. Census Bureau's X-13 ARIMA program.
2. For national SA, 1946Q1 to 1951Q2, seasonally adjust input (b) directly.
3. For national SA, from 1951Q3, compute as an identity, viz., sum over provinces (step (1)).

See also 

• Data Revision: Mexico subnational - LFS SA - Method (Jan 2020)
• Data Revision: Cyprus - NA employment SA - Method (Dec 2019)
• Data Revision: Croatia - National accounts SA - Method (Oct 2018)
• Data Revision: Denmark subnational - Business bankruptcies SA - Method (Sep 2018)
• Data Revision: U.S. subnational - ABA Credit Delinquency SA - Method (Sep 2018)