Abstract
It is well known that zero coupon rates are not observable variables. Their estimation process may be cumbersome and time consuming. We explore the extent to which the set of security prices used in the yield curve construction of three popular interest rate datasets (from the Federal Reserve Board, the US Department of the Treasury, and Bloomberg) may determine the results of different analyses. Using the same US Treasury prices from GovPX and applying the same fitting technique, we estimate zero coupon rates using different baskets of assets, i.e., including/excluding bills, on-the-run, and off-the-run bonds, attempting to mimic those used by each data providers. To illustrate the uncertainty surrounding these alternatives representations of the underlying yield curve, we examine common uses of these data sets in pricing, risk management and macroeconomic purposes. We find significant and sometime overwhelming differences in the volatility term structure, the pricing of interest rate derivatives, and the correlations among different forward rates particularly in both ends of the yield curve. Relevant implications are also observed on a classic test of the expectations hypothesis. The simplest asset basket, which only includes the on-the-run bills and bonds, is probably the one with the best results.
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Notes
The most recently issued security of a particular maturity.
As commented below, we replicate the baskets of securities these providers use to fit the Yield Curve (YC). We get intraday market prices of the US Treasury securities from the GovPX dataset. Thus, our sample period is limited for the availability of reliable prices from GovPX. The quality of this dataset deteriorates progressively, and we are forced to discontinue the sampling period at the end of 2006. See more details in the “Appendix”.
A daily updated spreadsheet can be downloaded from the FRB’s website in the section “Finance and Economics Discussion Series” below the Gürkaynak et al. (2007)’s working paper (https://www.federalreserve.gov/econresdata/feds/2006/index.htm). For convenience, this dataset is referred to “the FRB dataset”; however, the website indicates as follows: “Note: This is not an official Federal Reserve statistical release.”.
Thus, this dataset appears simultaneously in the DoT’s website (https://www.treasury.gov/resource-center/data-chart-center/interest-rates/Pages/TextView.aspx?data=yield) and the Fed’s website (https://www.federalreserve.gov/releases/h15/data.htm).
No more details are reported about the specific functions used to estimate the yield curve.
Bloomberg terminal mentions: “The yield curve is built daily with bonds that have either Bloomberg Generic (BGN) prices, supplemental proprietary contributor prices or both. The bonds are subject to option-adjusted spread (OAS) analysis and the curve is adjusted to generate a best fit. (…) Bloomberg Generic Price (BGN) is Bloomberg’s market consensus price (…) Bloomberg Generic Prices are calculated by using prices contributed to Bloomberg and any other information that we consider relevant”
See, e.g., Sarig and Warga (1989), Warga (1992), Fleming (2000), Amihud and Medelson (1991), Krishnamurthy (2002), Sack and Elsasser (2004), Goldreich, Hanke and Nath (2005), Díaz et al. (2006), Vayanos and Weill (2008), Pasquariello and Vega (2009), Díaz et al. (2011), Graveline and McBrady (2011) and Fontaine and García (2012), and Díaz and Escribano (2017).
Intermediaries in the repo market require Treasuries as collateral; for them, on-the-run bonds are appealing securities. These securities may trade on special, i.e., it can be used as collateral to borrow money at a rate below the prevailing general repo rate either because it is more liquid or because of its scarcity caused by a limited supply or a short squeeze.
According to BIS (2005), nine out of thirteen central banks currently use either the Nelson and Siegel (1987) model or its extended version suggested by Svensson (1994) to estimate the term structure of interest rates. One of the exceptions is the United States, which applies a “smoothing splines” method.
Andersen and Benzoni (2007) have documented that EGARCH representation for conditional yield volatility provides a convenient and successful parsimonious model for the conditional heteroskedasticity in these series.
The analysis using EGARCH volatilities provide similar results. The corresponding results are available upon request from the authors.
The DoT provides market yields at fixed maturities calculated from composites of quotations obtained by the Federal Reserve Bank of New York. According to the information on the DoT website, the yields are either investment yields or bond-equivalent yields. The formula uses simple interest and day count convention actual/actual. We recalculate this yield as a continuously compound interest rate. No 1-month rates are available in this dataset until August 1, 2001. Prior to this date, we estimate the corresponding interest rate by using cubic interpolation.
The data in Table 7 are reported in annualized percentage points, i.e., the natural monthly variables are multiplied by 1200.
GovPX Inc. was established under the guidance of the Public Securities Association as a joint venture among voice brokers in 1991 to increase public access to US Treasury security prices.
The “standard interest payment” field indirectly provides information to identify callable bonds and TIPS (Treasury Inflation-Protected Securities). We exclude these assets.
To fix a universal criterion for the entire maturity spectrum and sample period, such as excluding trades for which price or yield-to-maturity (YTM) exceeds certain percentage of the neighbour trades, does not work. Numerous factors imply differences in prices and YTM. For instance, assets with the same maturity and liquidity level but different coupon amounts are traded at different prices; turmoil and flight-to-liquidity periods involve high volatile prices; on-the-run bonds are often traded with a large liquidity premium and should not be considered outliers because they are the most actively traded assets and the market benchmark, etc. Additionally, there are interdealer brokers’ posting errors similar to those mentioned by Fleming (2003).
We do not consider the reported mid yield, which is simple interest with an actual/365 basis, except for more than 6-month remaining maturity bills, which are valued using the bond equivalent yield.
Note that the settlement date is generally one working day after the trading date.
We control for the special size of the first interest payment in just-issued securities.
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Acknowledgements
We are indebted to Zvika Afik, Alain Coën, Manfred Frühwirth, Alois Geyer, Robert Korajczyk, John Merrick, Pietro Millosovich, Alfonso Novales, Christian Speck, Christian Wagner, Josef Zechner and Hairui Zhang for very detailed suggestions. In addition, we would like to thank the anonymous referee for their constructive and valuable comments on this paper. This work was supported by the Spanish Ministerio de Economía, Industria y Competitividad (ECO2017-89715-P). Any errors are solely the responsibility of the authors.
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Appendix: Technical details of our dataset of government securities prices
Appendix: Technical details of our dataset of government securities prices
GovPX consolidates and posts real-time quotes and trades data from six of the seven major interdealer brokers (with the notable exception of Cantor Fitzgerald).Footnote 16 Collectively, these brokers account for approximately two-thirds of the voice interdealer broker market. In turn, the interdealer market is approximately one-half of the total market (see Fleming 2003). Thus, although the estimated bills coverage exceeds 90% in every year of the Fleming’s GovPX sample (Jan 97–Mar 00), the availability of 30-year bond data is limited because of Cantor Fitzgerald’s prominence in the long-maturity segment of the market. According to Mizrach and Neely (2006), voice-brokered trading volume began to decline after 1999 as electronic trading platforms (e.g., eSpeed, BrokerTec) became available. Indeed, GovPX does not provide aggregate volume and transaction information after May 2001. After ICAP’s purchase of GovPX in January 2005, ICAP PLC was the only broker reporting through GovPX. Therefore, we assume an imperceptible impact from the decline in GovPX market coverage on our estimates because we consider the midpoint prices and yields between the bid and ask prices at 5 pm.
The GovPX dataset contains snapshots of the market situation at 1 pm, 2 pm, 3 pm, 4 pm, and 5 pm. Each snapshot includes detailed individual security information, such as CUSIP, coupon, maturity date, and product type (an indicator of whether the security is trading when issued, on the run, or active off the run). The transaction data available until May 2001 include the last trade time, size, and side (buy or sell), the price (or yield in the case of bills), and the aggregate volume (volume in millions traded from 6 pm on the previous day to 5 pm). The quote data used from June 2001 include the best bid and ask prices (or discount rate actual/360 in the case of bills) and the mid-price and mid-yield (actual/365).
Our initial sample relies on the information at 5 pm, i.e., the last transaction during “regular trading hours” (from 7:30 am to 5:00 pm Eastern Time, ET), if available, and quote data otherwise. Quote prices are used during the last part of the sample period because trading volume information is not reported by GovPX. We complement the GovPX data with official data on the dates for the last issue and the first coupon payment and the coupon rate of each Treasury security.Footnote 17 This information is publicly available on the US Treasury website.
To improve the adjustment at the short end of the yield curve, we initially consider all Treasury bills. In this maturity segment, bills are very more actively traded than old off-the-run notes and bonds, most of which are absorbed into investors’ inactive portfolios.Footnote 18 Liquidity differences in these short-term assets imply large divergences in yields to maturity. Thus, we include only Treasury notes and bonds that have at least 1 year of life remaining. However, we are forced to modify this criterion from 2002 because the number of outstanding bills with terms to maturity between 6 months and 1 year declines considerable during the year 2000, and the 1-year Treasury bill is no longer auctioned as of the beginning of March 2001. Therefore, we also consider Treasury notes and bonds with remaining maturities between 6 and 12 months for the period after 2001.
We also apply other data filters that are designed to enhance the quality of the data. First, we do not include transactions that are associated with “when-issued” and cash management or trades and quotes that are related to callable and flower bonds and TIPS. Second, when two or more securities have the same maturity, we consider only trades and quotes for the youngest security, i.e., the security with the last auction date. Finally, we exclude yields that differ greatly from yields at nearby maturities. We apply an ad hoc filter based on common sense.Footnote 19 In addition, we occasionally observe that deleting a single data point in the set of prices used to fit the yield curve can produce a notable shift in both the parameters and the fitted yields, notably improving the fit. This phenomenon is also noted by Anderson and Sleath (1999).
To control for market conventions, we recalculate the price of each security in a homogeneous procedure to prevent a situation in which the effects of different market conventions depend on maturities and assets. Every price is valued at the trading date on an actual/actual day-count basis. In the case of Treasury bills, we first obtain the price at the settlement date from the last trade price, if available, and from the mid-price between the bid and the ask prices otherwise.Footnote 20 In both cases, the GovPX reported price is a discount rate using the actual/360 basis. Second, we compute the yield-to-maturity as a compound interest rate by using the actual/actual. Third, we calculate “our” price at the trading date by using the yield-to-maturity obtained in the previous step.Footnote 21 In the case of Treasury notes and bonds, the price is directly reported in the data as the last trade price or the mid-price. From this price, we apply the mentioned second and third steps to obtain “our” homogeneous price.Footnote 22
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Díaz, A., Jareño, F. & Navarro, E. Yield curves from different bond data sets. Rev Deriv Res 23, 191–226 (2020). https://doi.org/10.1007/s11147-019-09162-z
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DOI: https://doi.org/10.1007/s11147-019-09162-z
Keywords
- Term structure of interest rates
- Yield curve datasets
- Volatility term structure
- Forward rates
- Expectations hypothesis