Lp3: The Lp3 function applies the Log-Pearson Type III model to...

In NWCEd/NWCEd: National Water Census Education Demo

Description

The purpose of the Lp3 function is to apply the Log-Pearson Type III model to streamflow and precipitation datasets from the National Water Census Data Portal to obtain their respective frequency distribution curves. The desired datasets are to be previously downloaded from the Portal using the 'getNWCData' function and saved in a user-named variable. The user inputs two arguments into the Lp3 function: inputData (the user-named variable) and the desired dataset ("streamflow" or "prcp"). The function singles out the desired dataset and and converts units from metric to english. The dataset is organized into water years. Next, the Log Pearson Type III model is applied to the data. The function calls in Frequency Factors from a csv. Freqency factors were taken from http://streamflow.engr.oregonstate.edu/analysis/floodfreq/skew.htm.

Usage

Lp3(inputData, datatype)

Arguments

inputData	data.frame stored in user-named variable, returned by getNWCData
datatype	character choose from "streamflow" and "prcp"

Value

The return variable "plotthis" is a plot of the Log-Pearson Type III model applied to the user-selected USGS hydrologic dataset.

Examples

## Not run: 
variable_name<-getNWCData(huc = "160202030505", local = FALSE)
Lp3(variable_name, "prcp")

## End(Not run)

NWCEd/NWCEd documentation built on May 7, 2019, 6:04 p.m.