lR

LR is an initialism with multiple meanings across disciplines. In computer science, LR denotes a family of parsers and grammars that are read from left to right while constructing a rightmost derivation. LR parsing covers several variants, including LR(0), SLR, LALR, and Canonical LR, each balancing parser complexity and the size of the parsing table. LR parsers are valued in compiler design for their determinism and their ability to handle a wide class of programming languages, though some languages require more powerful or alternative parsing approaches.

In statistics and data analysis, LR commonly stands for the likelihood ratio, a statistic used in hypothesis testing and model comparison, particularly in likelihood ratio tests. In machine learning, LR is also a widely used abbreviation for logistic regression, a probabilistic model for binary classification that estimates the probability of outcomes via the logistic function.

Other uses include LR as the ISO 3166-1 alpha-2 country code for Liberia. The acronym also appears in contexts such as media and imaging to denote low resolution, where the meaning is dependent on the surrounding subject matter.

Overall, LR serves as a versatile acronym across computing, statistics, and international codes, and its specific meaning is typically inferred from the field and context in which it appears.