View source: R/calc_annual_outside_normal.R
calc_annual_outside_normal | R Documentation |
This function has been superseded by the calc_annual_normal_days()
function.
Calculates the number of days per year outside of the 'normal' range (typically between 25 and 75th percentiles) for each day of the year. Upper and lower-range percentiles are calculated for each day of the year of from all years, and then each daily flow value for each year is compared. All days above or below the normal range are included. Analysis methodology is based on Environment and Climate Change Canada's Water Quantity indicator from the Canadian Environmental Sustainability Indicators. Calculates statistics from all values from complete years, unless specified. Returns a tibble with statistics.
calc_annual_outside_normal(
data,
dates = Date,
values = Value,
groups = STATION_NUMBER,
station_number,
normal_percentiles = c(25, 75),
roll_days = 1,
roll_align = "right",
water_year_start = 1,
start_year,
end_year,
exclude_years,
months = 1:12,
transpose = FALSE
)
data |
Data frame of daily data that contains columns of dates, flow values, and (optional) groups (e.g. station numbers).
Leave blank or set to |
dates |
Name of column in |
values |
Name of column in |
groups |
Name of column in |
station_number |
Character string vector of seven digit Water Survey of Canada station numbers (e.g. |
normal_percentiles |
Numeric vector of two values, lower and upper percentiles, respectively indicating the limits of the
normal range. Default |
roll_days |
Numeric value of the number of days to apply a rolling mean. Default |
roll_align |
Character string identifying the direction of the rolling mean from the specified date, either by the first
( |
water_year_start |
Numeric value indicating the month ( |
start_year |
Numeric value of the first year to consider for analysis. Leave blank or set well before start date (i.e.
|
end_year |
Numeric value of the last year to consider for analysis. Leave blank or set well after end date (i.e.
|
exclude_years |
Numeric vector of years to exclude from analysis. Leave blank or set to |
months |
Numeric vector of months to include in analysis. For example, |
transpose |
Logical value indicating whether to transpose rows and columns of results. Default |
A tibble data frame with the following columns:
Year |
calendar or water year selected |
Days_Below_Normal |
number of days per year below the daily normal (default 25th percentile) |
Days_Above_Normal |
number of days per year above the daily normal (default 75th percentile) |
Days_Outside_Normal |
number of days per year below and above the daily normal (default 25/75th percentile) |
Transposing data creates a column of "Statistics" and subsequent columns for each year selected.
# Run if HYDAT database has been downloaded (using tidyhydat::download_hydat())
if (file.exists(tidyhydat::hy_downloaded_db())) {
# Calculate statistics with default limits of normal (25 and 75th percentiles)
calc_annual_outside_normal(station_number = "08NM116")
# Calculate statistics with custom limits of normal
calc_annual_outside_normal(station_number = "08NM116",
normal_percentiles = c(10,90))
}
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.