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Table 1 List of abbreviations.

From: Portfolio diversification benefits before and during the times of COVID-19: evidence from USA

Ticker

Definition

CWT

Continuous wavelet transform (CWT) analysis

WMC

Wavelet multiple correlation

WMCC

Wavelet multiple cross-correlation

DCC-MGARCH

Dynamic conditional correlation models

ARDL model

An autoregressive distributed lag model

MODWT

Maximal overlap discrete wavelet transform

Conventional indices

DJUS

Dow Jones US conventional index

DJUK

Dow Jones UK conventional index

DJCA

Dow Jones Canada conventional index

DJCH

Dow Jones Chine conventional index

DJJA

Dow Jones Japan conventional index

DJTUR

Dow Jones Turkey conventional index

DJMA

Dow Jones Malaysia conventional index

Islamic indices

DJIUS

Dow Jones US Islamic index

DJIUK

Dow Jones UK Islamic index

DJICA

Dow Jones Canada Islamic index

DJIJA

Dow Jones Japan Islamic index

DJTUR

Dow Jones Turkey Islamic index

DJIMA

Dow Jones Malaysia Islamic index