ma4.11: Function to return a list of the MA4-MA11 hydrologic...

In jlthomps/EflowStats: Returns HIT/HAT Hydrologic Indicator stats for a given set of data

Description

This function accepts a data frame that contains a column named "discharge" and calculates MA4; Standard deviation of the percentiles of the entire flow record divided by the mean of percentiles. Compute the 5th, 10th, 15th, 20th, 25th, 30th, 35th, 40th, 45th, 50th, 55th, 60th, 65th, 70th, 75th, 80th, 85th, 90th, and 95th percentiles for the entire flow record. Percentiles are computed by interpolating between the ordered (ascending) flow values. Compute the standard deviation and mean for the percentile values. Divide the standard deviation by the mean to get MA4. (percent-spatial) MA5; The skewness of the entire flow record is computed as the mean for the entire flow record (MA1) divided by the median (MA2) for the entire flow record (dimensionless-spatial). MA6; Range in daily flows is the ratio of the 10-percent to 90-percent exceedence values for the entire flow record. Compute the 5-percent to 95-percent exceedence values for the entire flow record. Exceedence is computed by interpolating between the ordered (descending) flow values. Divide the 10-percent exceedence value by the 90-percent value (dimensionless-spatial). MA7; Range in daily flows is computed like MA6 except using the 20-percent and 80-percent exceedence values. Divide the 20-percent exceedence value by the 80-percent value (dimensionless-spatial). MA8; Range in daily flows is computed like MA6 except using the 25-percent and 75-percent exceedence values. Divide the 25-percent exceedence value by the 75-percent exceedence value (dimensionless-spatial). MA9; Spread in daily flows is the ratio of the difference between the 90th and 10th percentile of the flow data to median of the entire flow record. Compute the 5th, 10th, 15th, 20th, 25th, 30th, 35th, 40th, 45th, 50th, 55th, 60th, 65th, 70th, 75th, 80th, 85th, 90th, and 95th percentiles for the entire flow record. Percentiles are computed by interpolating between the ordered (ascending) flow values. Compute MA9 as (90th-10th) /MA2 (dimensionless-spatial). MA10; Spread in daily flows is computed like MA9 except using the 20th and 80th percentiles (dimensionless-spatial). MA11; Spread in daily flows is computed like MA9 except using the 25th and 75th percentiles (dimensionless-spatial).

Usage

  ma4.11(x)

Arguments

x	data frame containing a "discharge" column containing daily flow values

Value

ma4.11 list of the MA4-MA11 statistics for the given data frame

Examples

qfiletempf<-sampleData
ma4.11(qfiletempf)

jlthomps/EflowStats documentation built on May 19, 2019, 12:48 p.m.