Deltarho {DFA} R Documentation

## Delta Amplitude Detrended Cross-Correlation Coefficient (DeltarhoDCCA)

### Description

Applies the Detrended Cross-Correlation Coefficient Difference (Deltarho) to nonstationary time series.

### Usage

Deltarho(file,file2,file3,file4,scale = 2^(1/8),box_size = 4,m=1)


### Arguments

 file Univariate time series (must be a vector or data frame) file2 Univariate time series (must be a vector or data frame) file3 Univariate time series (must be a vector or data frame) file4 Univariate time series (must be a vector or data frame) scale Specifies the ratio between successive box sizes (by default scale = 2^(1/8)) box_size Vector of box sizes (must be used in conjunction with scale = "F") m An integer of the polynomial order for the detrending (by default m=1).

### Details

The Deltarho can be computed in a geometric scale or for different choices of boxes sizes.

### Value

 boxe Size n of the overlapping boxes. DFA1 DFA of the first time series (file). DFA2 DFA of the second time series (file2). DFA3 DFA of the third time series (file3). DFA4 DFA of the fourth time series (file4). DCCA Detrended Cross-Correlation function between the first time series (file) and the second time series (file2). DCCA2 Detrended Cross-Correlation function between the third time series (file3) and the fourth time series (file4). rhoDCCA Detrended Cross-Correlation Coefficient function, defined as the ratio between the DCCA and two DFA (DFA1,DFA2). rhoDCCA2 Detrended Cross-Correlation Coefficient function, defined as the ratio between the DCCA2 and two DFA (DFA3,DFA4).

### Note

The time series file,file2,file3 and file4 must have the same sample size.

### Author(s)

Victor Barreto Mesquita

### References

SILVA, Marcus Fernandes da et al. Quantifying cross-correlation between ibovespa and brazilian blue-chips: The dcca approach. Physica A: Statistical Mechanics and its Applications, v. 424,2015.

### Examples

#The following examples using the database of financial time series
#collected during the United States bear market of 2007-2009.

library(DFA)
data("NYA2008")
data("IXIC2008")
data("LSE.L2008")
data("SSEC2008")

file = NYA2008
file2= IXIC2008
file3 = LSE.L2008
file4 = SSEC2008

Deltarho(file,file2,file3,file4,scale = 2^(1/8),box_size = c(4,8,16),m=1)

# Example with different polynomial fit order.

library(DFA)
data("NYA2008")
data("IXIC2008")
data("LSE.L2008")
data("SSEC2008")

file = NYA2008
file2 = LSE.L2008
file3= IXIC2008
file4 = SSEC2008

Deltarho(file,file2,file3,file4,scale = 2^(1/8),box_size = c(4,8,16),m=2)

# Example using different choice of overlapping boxes sizes.

library(DFA)
data("NYA2008")
data("IXIC2008")
data("LSE.L2008")
data("SSEC2008")

file = NYA2008
file2= IXIC2008
file3 = LSE.L2008
file4 = SSEC2008

Deltarho(file,file2,file3,file4,scale = "F",box_size = c(4,8,16),m=1)



[Package DFA version 0.9.0 Index]