45 lines
726 B
Markdown
45 lines
726 B
Markdown
# Stand indices
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## Mutate individual tree records
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Calculate a new column from values recorded from an individual tree.
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* 5 cm diameter classes
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* diameter increment
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```R
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df |>
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mutate(newColumn = function(Value)
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```
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## Summarise functions
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Calculate a single value for a group using `group_by() |> summarise()`
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* q value
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* Gini coefficient
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* Shannon Diversity Index
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* SDI
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* transition period (C&A used cores)
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* annual recruitment
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* TH (filter just the height data)
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```R
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df |>
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group_by(Plot, Year) |>
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summarise(
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measure = function(Value)
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)
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```
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## Mutate aggregate values
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Calculate a new column from group-level aggregate values
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* form class
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* form height
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```R
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df |>
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mutate(newColumn = function(Value)
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``` |