Part Time Employment Chg is the monthly change in part-time employment from the Labour Force Survey (LFS, Canada's monthly household survey). Statistics Canada (StatCan, national statistics agency) conducts it. Part-time means usually working less than 30 hours per week at the main or only job (job with most usual hours).
It covers people aged 15 years and older living in Canada, excluding people on reserves, full-time military, institutions, and territories from national totals. The survey began in 1945 and became a monthly survey in 1952. It is a net estimate (gains minus losses), not payroll jobs (employer job counts) or gross hiring flows.