某炭鉱鉱夫の脱落度に関する統計学的観察

抄録

The length of working for a total number of 2,310 “direct” miners employed since 1954in the Changsung Mining Office has been investigated. It has been found that more than 65 per cent of the miners leave the job within 5 years and the median duration remaining in the job is merely 3.1 years. It should be noted that a high force of “loss” of miners is observed within half a year and after 3 years of employment.
The major causes for leaving the job within 3 years may be attributed to disciplinary dismiss and other reasons of the enterpriser and after 3 years to accident and personal reasons.
When considered by age groups, those oldest and youngest groups show the poorest picture, while over half of the miners employed at the age groups of 25-29 remained in the job even after 5.5 years of employment, having the longest working life expectancy among all the age groups.
As the type of job is not fixed for each miner, thoe working life according to the type at the time of employment does not provide a sound ground for evaluation. However, generally speaking, the coal-pickers show very poor degree of remaining as compared with others.
Those illiterate and with high education quickly drop out of the job.
Those with previous experience in mining remain in the job longer than those without previous experience, when considered all cause of leaving, but the reverse is true when the cause of accident is considered only.