Stand indices

Mutate individual tree records

Calculate a new column from values recorded from an individual tree.

• 5 cm diameter classes
• diameter increment

df |>
  mutate(newColumn = function(Value)

Summarise functions

Calculate a single value for a group using group_by() |> summarise()

• q value
• Gini coefficient
• Shannon Diversity Index
• SDI
• transition period (C&A used cores)
• annual recruitment
• TH (filter just the height data)

df |>
  group_by(Plot, Year) |>
  summarise(
    measure = function(Value)
  )

Mutate aggregate values

Calculate a new column from group-level aggregate values

• form class
• form height

df |>
  mutate(newColumn = function(Value)