Abstract
This article examines the causal relationship between intraday return and volume by using 1-minute intraday data of 35 stocks of S&P CNX Nifty index during the period from April 2007 to March 2011. The empirical analysis provides evidence to the mixture of distribution hypothesis (MDH), as a majority of stocks of S&P CNX Nifty index show no causal relationship between the intraday return–volume relationships. However, this study finds evidence of significant causal and lead–lag relations between the intraday return–volume associations for some stocks. These findings reveal strong indication of uni- and bi-directional causality, thus supporting the sequential information arrival hypothesis (SIAH) which suggests that lagged values of volume provide the predictability component of current return (vice versa).
Keywords
Introduction
The proficiency of equity market is a principal prerequisite for the development of any economy. Understanding the efficiency has been on the target of investors and speculators for a long time. It has also been accredited time and again that return and volume are two major pillars around which the stock market revolves. While returns are interpreted as the evaluation of the new information, volume is an indicator to which the investors disagree about this information (Mahajan & Singh, 2009). Reviewing the combined dynamics of stock prices and trading volume is essential to improve the understanding of the microstructure of stock markets (Mestel et al., 2003). Return–volume associations are of mutual interest as they may excavate reliance that can form the basis of lucrative trading strategies, and this has implications for market efficiency (Chen, Firth & Yu, 2004).
Karpoff (1987) cited four reasons for focusing on price–volume relation. First, it provides insight into the structure of financial markets, such as the rate of information flow to the market, how the information is disseminated, the extent to which market prices convey the information and the existence of short sales constraints. Second, the relationship between price and volume can be used to examine the usefulness of technical analysis. Third, the price–volume relation is critical to the debate over the empirical distribution of speculative prices. And fourth, the unpredictable price–volume relationship may have important implications for moulding new agreements. In addition, the return–volume relationship sheds light on the efficiency of stock markets.
By examining these facets of the stock market, it can be understood that the inter-temporal causality relationship between return, volume and volatility sheds light on the informational proficiency of the market (Kocagil & Shachmurove, 1998). Movements in stock prices (commonly known as returns) and trading volume are influenced by the flow of new information into the market. A proposition of causality from volume to returns (vice versa) disrupts norms of the weak-form efficiency hypothesis.
Uni-directional causal relationship advocates that information transmits from volume to return/volatility, return to volume/volatility and from volatility to volume/return, and thus suggests that the lagged values of a measure provide the predictability component of the other measure. Thus, the feedback relationship between return, volume and volatility suggests that both variables encompass imperative material, which helps traders to price the value content of new information. A positive causal relation from returns to volume is consistent with the positive response trading strategies of noise traders, for whom the trading decision is based on past stock price movements (see Long, 1990; Lokman & Abdulnasser, 2005). On the other hand, bi-directional causality implies response relationship but it does not disprove the likelihoods of witnessing lead–lag relationship between volume and return.
Prior literature emphasizes on two theoretical explanations for the observed causal return–volume–volatility relations of stocks, namely, the mixture of distribution hypothesis (MDH) and the sequential information arrival hypothesis (SIAH). The SIAH of Copeland (1976), Jennings et al. (1981) and Smirlock and Starks (1985) assumes that traders receive new information in a random, unsystematic fashion. This class of models assume that information is observed by each trader sequentially and arbitrarily. This leads to the sequential reaction to information, accordingly suggesting that lagged values of volatility may have the ability to predict current trading volume/return, and vice versa. Conversely, the MDH advanced by Clark (1973), Harris (1987) and Anderson (1996) implies an alternative return–volatility–volume nexus. The model assumes all traders simultaneously receive the new price signals. As such, there should be no information content in past volatility data that can be used to forecast volume/return (vice versa), since these variables contemporaneously react to new information (Darrat, Rahman & Zhong, 2003).
These theories of SIAH and MDH provide a detailed understanding of the relationship between intraday return, volume and volatility and may help investors to recognize potential patterns of the stock market which can be used in their speculation choices. Second, the intraday price–volume relation can also be used as a basis of trading strategy for checking the efficiency of stock markets. Third, the relationship between intraday return and volume can be used to scrutinize the utility of technical analysis. Evidence states there is a dearth of studies which have examined the causal relationships on an intraday basis (see Table 1). This article is thus, to the best of our knowledge, one of the first efforts to examine the causal relation between intraday return and volume by using 1-minute intraday data of 35 stocks of S&P CNX Nifty index. This intraday analysis will shed light on the efficiency of the Indian stock market.
Review of Literature
An examination of potential causality from past values of volume to present returns as well as from past returns to present volume is concerned with issues relating to informational efficiency of the market (Mcmillan & Speight, 2002). An indication of causality from past values of volume to returns violates assumptions of the weak-form efficiency hypothesis, since it carries the implication that an investor is able to make systematic profits.
Voluminous literature is available (see Table 2) with respect to studies which have reported the evidence (and/or in evidence) of causality between return, volume and volatility with low-frequency data (daily, weekly and monthly). The intraday-based analysis (minute, hourly) is a relatively new phenomenon in the stock market. There is a dearth of literature (see Table 1) with respect to high-frequency-based studies, particularly in the Indian context. This study thus aims to plug this literature gap by empirically examining the intraday return and volume measures of the Indian equity market.
The studies conducted at low-frequency time interval which have reported no causal relationship are those by Granger et al. (1964) who tested the relationship between the price and volume of individual stocks and found no relationship between the two. Chen et al. (2004) reported evidence of no causal relation between return and volume series of China’s stock market. Otavio (2006) further supported the MDH by observing no causality relationship between return and volume for the Bovespa index of Brazil. This finding was further supported by another study at the Brazilian stock market by Medeiros and Doornik (2008) who reported no causality evidence as well. These studies at daily frequencies are in conformance to the MDH, which suggests that the information dissemination is contemporaneous. In other words, futures prices (and volume) only change when information arrives, and they evolve at a constant speed in event time (Sutcliffe, 1993). The MDH implies only a contemporaneous relationship between volume and (absolute) returns, where the shift to a new equilibrium is immediate. It is associated with research efforts of Clark (1973), Epps and Epps (1976), Tauchen and Pitts (1983) and Harris and Gurel (1986).
Empirical studies which report a uni-directional causal relationship from return to volume data sampled at daily frequencies are those of Tauchen and Pitts (1983), Karpoff (1987), Gallant et al. (1992), Lamoureux and Lastrapes (1994) and Jones et al. (1994). These studies support the notion of Copeland (1976) who introduced the SIAH with asymmetrically distributed information in which information flows sequentially from one trader to another. Other eminent empirical studies, which reported similar results while examining the price–volume relationship are those by Lee and Rui (2002), Ciner (2003), Mishra (2004), Ramaprasad and Shigeyuki (2004), Gurgul et al. (2005), Tambi (2005), Nguyen and Diagler (2006), Anirut and Abeyratna (2006) and Mahajan and Singh (2008).
Empirical Evidence on Causal Relationship between Intraday Return, Volume and Volatility
Empirical Evidence on Causal Relationship between Return, Volume and Volatility
The empirical works which observed bi-directional causality between measures of return, volume and volatility are those of Malliaris and Urrutia (1992), Bhanupant (2001), Chen et al. (2001), Mestel et al. (2003), Mahajan and Singh (2008b), Kumar et al. (2009), Gurgul and Syrek (2013), Floros (2008) and Bruggermann et al. (2013). These empirical evidences support the SIAH and reject the MDH of Clark (1973). These studies imply that news is revealed to investors sequentially, not simultaneously, which in turn initiates a sequence of transitional price equilibrium compounded by the persistence of high trading volumes. Due to the sequential nature of the process, lagged trading volume may help to predict current stock returns, as much as lagged returns can predict current volume (see Copeland, 1976; Hatekar, Gupta, Suryavanshi & Tiwari, 2013; Mahajan & Singh, 2008c; Rajput, Kakkar, Batra & Gupta, 2012).
The causal relationship between these measures has been examined on an intraday basis by Darrat et al. (2003) who studied 30 Dow Jones Industrial Average (DJIA) stocks at 1-minute interval and found uni-directional causality from volume to volatility. Giot (2005) fitted generalized autoregressive conditional heteroskedasticity (GARCH) models to de-seasonalized 15- and 30-minute returns. Extra complication when dealing with intraday volume and volatility lies in the handling of the intraday seasonality and market microstructure noise. Darrat et al. (2007) examined the Granger causality between volume and volatility using 1-month New York Stock Exchange (NYSE) tick data.
Further, Hatrick (2010) studied the stocks listed on the Hong Kong stock exchange at intraday time intervals of 10, 20 and 30 minutes and found evidence of uni-directional causality from volume to volatility, thus conforming to the notion that lagged values of volume (volatility) have a forecasting power for the volatility (volume) measure. Further Celik (2013) found evidence of bi-directional causality at 5-minute interval analysis. These studies conformed to the sequential information arrival pattern for these markets. In addition to these empirical investigations, outstanding inspections on the use of high-frequency financial data sets in financial econometrics are provided by Mulherin and Gerety (1988), Jones et al. (1994), Campbell et al. (1997), Engle and Russell (1998), Darolles et al. (2006), Anderson (2000), Wood (2000), Ghysels (2000), Dacarogna et al. (2001), Gouri´eroux and Jasiak (2001), Lyons (2001), Tsay (2001) and Ghysels et al. (2014). As can be seen from Table 1, there is a literature gap with respect to intraday-based studies in the context of the Indian equity market. This article aims to plug in the same.
Data and Methodology
This study is based on 1-minute interval data of 35 stocks listed on S&P CNX Nifty index, during the period from 1 April 2010 to 31 March 2011. The S&P CNX Nifty index is a well-differentiated 50-stock index precisely imitating general market environments, characterized by very dynamically dealt stocks. This study applies the filters of bonus issue and stock split announcement and derives a concise and well-balanced sample of 35 stocks. The intraday stock return parameter comprises continuous rates of return, computed as log of ratio of present minute’s price to previous minute’s price (i.e., Rt = ln (Pt/Pt – 1)). Volume is taken as per the trading volume data.
Empirical Findings and Analysis
The examination of the relationship between return and volume provides significant information regarding the price discovery efficiency of an asset. The summary statistics of the sample stocks suggests that dispersion of mean returns represents trivial values, thereby indicating a steady index. This authorizes the belief that the index under examination is a very safe index. Substantial Jarque–Bera statistics undoubtedly discards the hypothesis, which suggests that all variables do not conform to normal distribution, which is the precondition for any market to be efficient in the weak form (Fama, 1965; Kamath et al. 1998; Reddy, 1997; Stevenson & Bear, 1970).
Further, the statistics of skewness and kurtosis preserve the substantiation of withdrawal from normality hypothesis. The realistic distribution of the return and volume series in this article is positively skewed, indicating a right tail of distribution. These positively skewed series accentuate the asymmetric nature of the series. Additionally, the excess kurtosis projected for trading volume series is a strong indication of leptokurtic peaked series. The extreme kurtosis values of Indian markets demonstrate extraordinary erraticism in the returns measure. The results of this article thus suggest the high probability of extreme values (profit/loss) occurring. These results further stress that only the chief and dominant players attained the core of trading activity, while the small-time traders could not participate actively in the trading activity.
For the stocks of S&P CNX Nifty index, this article verifies the existence (inexistence) of inter-temporal relationship between intraday return and volume series. This study applies the Granger causality test for determining whether one intraday measure can be used to forecast the other measure. For this, the precondition is that the series under study should be stationary in nature. Therefore, the augmented Dickey–Fuller (ADF) unit root test results are estimated on the basis of the technique. The unit root test results shows that intraday return and volume are stationary at 1 and 5 per cent levels of significance, respectively, for all the 35 stocks comprising the sample.
For the S&P CNX Nifty index, this article verifies the existence of relationship and direction of information flow between intraday return and volume with the Granger causality test, which determines whether one intraday series is useful in forecasting another. The lags for the Granger causality test are estimated according to the Schwarz information criterion (SIC). Further, the extent of lead–lag relationships is estimated with the vector autoregression (VAR) test.
An analysis of Table 3 reveals that no causality was observed for 22 stocks amounting for 62.85 per cent of the sample (namely, ACC, AXISBANK, BANKBARODA, BHEL, BPCL, CAIRN, CIPLA, COALINDIA, HCLTECH, HDFCBANK, HEROMOTOCO, HINDUNILVR, ICICIBANK, IDFC, INDUSINDBK, INFOSYSTCH, LT, MARUTI, PNB, POWERGRID, SSLT and TATAPOWER). These results are further supported by the VAR results which confirm no causal relationship between intraday return and volume measures for these stocks. These stocks, which exhibit no causality, are in conformance to the mixture of distributions hypothesis, which suggests that the information dissemination in the Indian equity market is synchronous. In other words, futures returns (and volume) only change when information arrives, and they evolve at a constant speed in event time (Sutcliffe, 1993). The MDH implies only a coexistent relationship between volume and (absolute) returns. It is associated with Clark (1973), Epps and Epps (1976), Tauchen and Pitts (1983) and Harris (1986).
Table 3 depicts Granger causality test results for stocks depicting uni-directional causality between intraday return and volume. The results of this study show that 10 stocks comprising 28.57 per cent of the index constitute this sample. Out of these, three stocks exhibit a uni-directional causality from intraday return to volume (namely, ASIANPAINT, GRASIM and RANBAXY) which amount to 8.57 per cent of total sample size. The VAR results ascertain that for stock ASIANPAINT and RANBAXY, intraday return leads volume by 1 lag (1 minute). In case of GRASIM, intraday return leads volume at 2 lags (2 minutes). The findings of the present study of uni-directional causality from intraday return to volume are consistent with prior empirical findings of Lee and Swaminathan (2000), Lee and Rui (2002), Mcmillan and Speight (2002), Mestel et al. (2003) and Otavio et al. (2006).
Additionally, seven stocks show uni-directional Granger causality from intraday volume to return (see Table 3) amounting to 20 per cent of sample, namely, AMBUJACEM, DLF, DRREDDY, HINDALCO, NTPC, ULTRACEMCO and WIPRO. The VAR results identify the extent of lead–lag relation between these stocks. For stock AMBUJACEM, HINDALCO and ULTRACEMCO, intraday volume can predict return by 2 lags (2 minutes). For stocks DLF, DRREDDY and WIPRO, intraday volume leads return by 1 lag (1 minute). In the case of NTPC, the intraday volume series leads return by 3 lags (3 minutes).
Thereafter, this study identifies (see Table 3) that only three stocks constituting 8.57 per cent of total sample size observe bi-directional Granger causality between intraday stock return and volume (namely, SBIN, TATAMOTORS and TATASTEEL). The VAR test results depict that for SBIN, the intraday return and volume series exhibit response causality. Here, we note that intraday return can predict volume by 4 lags (4 minutes), whereas intraday volume can predict return by 10 lags (10 minutes). This indicates that intraday volume leads return by 6 lags (6 minutes). Furthermore, for TATAMOTORS, intraday return causes volume by 3 lags (3 minutes) and intraday volume causes return by 2 lags (2 minutes). Therefore, it can be concluded that intraday return leads volume by 1 lag (1 minute). In case of TATASTEEL, both intraday return and volume cause each other at 2 lags (2 minutes) showing that regardless of the existence of a two-way causality, there is no lead–lag relationship between the intraday variables of this stock.
Granger Causality Results for Intraday Return and Volume
For these stocks exhibiting a bi-directional causality, news is revealed to investors sequentially, which originates a sequence of transitional price equilibrium is compounded by the persistence of high trading volumes. Due to the sequential nature of the process, lagged trading volume may help to predict current stock returns, as much as lagged returns can predict current volume (Copeland, 1976). The results of this study are consistent with empirical findings of Gallant et al. (1992), Wang (1994), Chordia and Swaminathan (2000), Chen, Firth and Rui (2001), Llorente et al. (2002), Gunduz and Hatemi (2005), Pisedtasalasai and Gunasekarage (2008) and Deo et al. (2008). Studies by Mulherin and Gerety (1988), Foster and Viswanathan (1993), Darolles et al. (2006) and Ghysels et al. (2014) have reported similar outcomes of bi-directional causality between intraday return and volume on an intraday basis.
Conclusion
It is well understood that the activity of the stock market cannot be decided only on the basis of prices. Stock prices deprived of their related volume measures deliver ambiguous information about market movement. Thus, this article examines the inter-temporal relationship between intraday return and volume of stock market by using 1-minute interval data for the S&P CNX Nifty index of the National Stock Exchange (NSE, India’s primary stock exchange).
Table 4 provides a clear pictorial depiction of the direction of flow of information between the measures of intraday return and volume. This study concludes that stocks which exhibit no causality between the measure of intraday return and volume are in conformance to the MDH, which suggests that the information dissemination in the Indian equity market is synchronous. In other words, futures returns (and volume) only change when information arrives, and they evolve at a constant speed in event time (Sutcliffe, 1993). Further, the stocks which depict unibidirectional causality conform to Copeland’s (1976) SIAH. This hypothesis caters to asymmetrically distributed information in which information flows sequentially from one trader to another. In other words, traders estimate the availability of private information using past periods’ trading volume and use this information to adjust their strategies. These stocks support the theory that the trading volume-based information is crucial for affecting the behaviour of the liquidity traders.
Direction of Flow of Information between Intraday Return and Volume
With the exploration into these intraday causal relationships of S&P CNX Nifty index, market investors and regulators can obtain a healthier understanding of the risk evolution of their financial exposure in trading sessions within a day. This implies that based on the information of intraday return and volume, these market speculators are able to implement an improved risk management exercise. The results of this study are supportive of NSE’s transparent transactions combined with lower operational prices and efficiency, which have greatly increased the attractiveness of the Indian stock market to domestic and international investors.
