An.In relation to motorsport governed by the, Group R refers to a set of regulations providing production-derived vehicles for competition. The Group R regulations were created in 2008 as a gradual replacement for and rally cars.To comply with Group R regulations, a car must be homologated in Group A (or in some cases Group N) and receive one or more VR extensions.
Each VR extension is a set of homologated parts and modifications, designed and sold (as a kit or as a complete car) by the manufacturer.As part of its structure, the Group R regulations have a provision for cars, known as. This section needs to be updated. Please update this article to reflect recent events or newly available information. ( September 2018)Group R consists of six classes, designated R1, R2, R3, R4, R5 and RGT; some of these groups contain their own sub-groups, with cars allocated to each group based on their weight, engine size and powertrain.
The first batch of rules, introduced in 2008, featured R1, R2 and R3 classes, reserved to two-wheels drive cars with atmospheric engines up to 2000cc. Supercharged engines were allowed only in R3T (petrol) and R3D (diesel) classes. Additional regulations were issued in 2011 covering R4 and RGT classes; the R4 was conceived as an evolution step for previously homologated Group N4 (turbocharged, all-wheel drive) cars. The R5 class, designed to replace cars, was introduced in 2013.Since 2015 the R1, R2 and R3 classes allow supercharged engines with a 1.5 equivalency factor for displacement.Teams and drivers are sorted into a specific championship based on the class their car fits into. Cars classified as R1, R2 and R3 contest the for two-wheel drive cars; especially-prepared R3T cars are also used in the. Cars classified as R4 and R5 compete in the alongside existing.
If you use groupby first, they will summarize each group, but if there's no grouping, it would summarize the whole data frame. What is the question you are trying to answer? It looks like you're trying to sum some columns that are Chr (character) - that seems impossible so I presume you mean something else.