Ar value 1.8 is equivalent to a low level. Acceptance rate is an index used to measure the acceptance rate of academic conferences or journals. Ar value represents the ratio between the number of accepted papers and the total number of submitted papers. For different disciplines and conferences/periodicals, the interpretation of ar value may be different. Generally, the lower the ar value, the harder it is to hire a conference or periodical, and the higher the quality of the paper. Generally speaking, the ar value around 1.8 is a relatively low level.