ch_polar_plot_prep {CSHShydRology} R Documentation

## Creates a data structure to be passed to ch_polar_plot

### Description

Could be used to move data from a different type of analysis different to the ch_binned_MannWhitney function which uses flows. The two series need to be of the same length and their length is related to the step size. For examples, for five day periods there will be 73 periods.

### Usage

ch_polar_plot_prep(
station,
plot_title,
step,
x0,
x1,
stat,
prob,
test_s,
variable = "discharge",
bin_method = "unstated",
test_method = "unstated",
lline1 = "Period 1",
lline2 = "Period 2",
pvalue = 0.05
)


### Arguments

 station Typically a station number plot_title Polar plot title - usually a station name step The number of days binned x0 Time series of length n for a single seasonal cycle x1 Time series of length n for a single seasonal cycle stat Time series of length n for statistical test value for each bin prob Time series of length n of probability of test value test_s Vector with values of -1, 0, 1 for significance, -1 negative, 1 positive, 0 not significant variable Name of variable plotted. Default is discharge bin_method Default is unstated test_method Default is unstated lline1 Names of first period, default is Period 1 lline2 Names of second period, default is Period 2 pvalue Value of p used. Default is 0.05

### Value

Returns a list containing:

 StationID ID of station Station_lname Name of station variable Name of variable bin_width Smoothing time step in days range1 First range of years range2 Second range of years p_used p_value fail TRUE if test failed due to missing values bin_method Method used for binning test_method Mann-Whitney U series A data frame containing six columns

The series data frame contains

 period period numbers i.e. 1:365/step period1 median values for each bin in period 1 period2 median values for each bin in period 2 mwu Mann Whitney U-statistic for each bin between the two periods prob probability of U for each period code significance codes for each bin

Paul Whitfield

### References

Whitfield, P.H. and A.J. Cannon. 2000. Polar plotting of seasonal hydrologic and climatic data. Northwest Science 74: 76-80.

Whitfield, P.H., Cannon, A.J., 2000. Recent variations in climate and hydrology in Canada. Canadian Water Resources Journal 25: 19-65.

ch_binned_MannWhitney ch_polar_plot