Pre, During and Post Covid-19 Stock Returns and Volatility Comparison:

Dr Nawaz Ahmed, Ramsha Nazeer, Amira Kaddour
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Abstract

This study aims to study the pre, during and post-COVID-19 stock returns and volatility associated with Pakistan. For this study, daily financial data from 2018 to 2023. This study is based on daily prices and their returns. The data was divided into categories like Category A: Before the COVID-19 pandemic, Category B: during the COVID-19 pandemic and Category C: Post COVID-19 pandemic. The indices period is from 1st January 2018 to 25th February 2020 (Pre Covid-19), 26th February 2020 to 31st December 2021 (during Covid-19) and from 1st March 2022 to 8th May 2023 (Post Covid-19) period. The data were treated with Descriptive and Econometric Models using E-views, Microsoft Excel and SPSS. The findings of this research are that there is no stationarity issue in all the returns’ series, and the average return for Pre (Category A) and Post Covid periods (Category C) is positive; however, it is negative During the Covid period (Category B) which shows the bearish trend in Pakistan Stock Exchange market (PSX) due to the Covid-19 outbreak. Moreover, the coefficient of variation (CV) is computed, which shows that pre-COVID tenure has the highest relative dispersion (CV = 44.43), followed by during COVID (CV = 40.76), and post-COVID tenure has the most negligible coefficient of relative dispersion (CV = 23.1) which refers to the least volatile phenomenon. The findings also suggest no statistically significant difference among all average returns, and all are equal. The results from the econometric model show that the highest mean reversion value was 0.969991 During the COVID period. Post-COVID has a value of 0.449377, which indicates the quick mean reversion compared to the other two.
19 科维德事件前、期间和之后的股票回报率和波动率比较:
本研究旨在研究与巴基斯坦相关的 COVID-19 之前、期间和之后的股票回报率和波动性。本研究采用 2018 年至 2023 年的每日金融数据。本研究基于每日价格及其回报。数据分为 A 类:COVID-19 大流行之前;B 类:COVID-19 大流行期间;C 类:COVID-19 大流行之后。指数期为 2018 年 1 月 1 日至 2020 年 2 月 25 日(Covid-19 之前)、2020 年 2 月 26 日至 2021 年 12 月 31 日(Covid-19 期间)和 2022 年 3 月 1 日至 2023 年 5 月 8 日(Covid-19 之后)。使用 E-views、Microsoft Excel 和 SPSS 对数据进行了描述性和计量经济学模型处理。研究结果表明,所有收益率序列都不存在静态问题,Covid 前(A 类)和 Covid 后(C 类)期间的平均收益率均为正值;但 Covid 期间(B 类)的平均收益率为负值,这表明由于 Covid-19 的爆发,巴基斯坦证券交易市场(PSX)呈看跌趋势。此外,计算的变异系数(CV)显示,COVID 前的任期具有最高的相对离散性(CV = 44.43),其次是 COVID 期间(CV = 40.76),而 COVID 后的任期具有最微不足道的相对离散系数(CV = 23.1),这意味着波动现象最小。研究结果还表明,所有平均收益率在统计上没有显著差异,都是相同的。计量经济学模型的结果显示,在 COVID 期间,最高的平均回归值为 0.969991。后 COVID 期间的平均回归值为 0.449377,表明与其他两个期间相比,平均回归速度较快。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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