summarise_for_trends | R Documentation |
Compute annual summaries of water quality observations.
summarise_for_trends( data, breaks = NULL, FUN = "median", messages = getOption("wqbc.messages", default = TRUE) )
data |
The data.frame to analyse. |
breaks |
A numeric vector used to create groups of consecutive months, if NULL the full year is used. |
FUN |
The function to use for yearly summaries, e.g. median, mean, or max. |
messages |
A flag indicating whether to print messages. |
The data must contain the columns Station, Date, Variable, Value, and Units.
A tibble data.frame with rows for each Station, Variable, Year and month grouping.
# select one station data(yuepilon) data <- yuepilon[yuepilon$Station == "02EA005", ] # estimate trend (using simple sen slope) trend <- test_trends(data, messages = TRUE) # get the data used in the test datasum <- summarise_for_trends(data) plot(datasum$Year, datasum$Value, main = paste("p-value =", round(trend$significance, 3)), ylab = "Value", xlab = "Year", las = 1 )
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