Assumption Errors and Forecast Accuracy: A Partial Linear Instrumental Variable and Double Machine Learning Approach
Katja Heinisch, Fabio Scaramella, Christoph Schult
IWH Discussion Papers,
Nr. 6,
2025
Abstract
Accurate macroeconomic forecasts are essential for effective policy decisions, yet their precision depends on the accuracy of the underlying assumptions. This paper examines the extent to which assumption errors affect forecast accuracy, introducing the average squared assumption error (ASAE) as a valid instrument to address endogeneity. Using double/debiased machine learning (DML) techniques and partial linear instrumental variable (PLIV) models, we analyze GDP growth forecasts for Germany, conditioning on key exogenous variables such as oil price, exchange rate, and world trade. We find that traditional ordinary least squares (OLS) techniques systematically underestimate the influence of assumption errors, particularly with respect to world trade, while DML effectively mitigates endogeneity, reduces multicollinearity, and captures nonlinearities in the data. However, the effect of oil price assumption errors on GDP forecast errors remains ambiguous. These results underscore the importance of advanced econometric tools to improve the evaluation of macroeconomic forecasts.
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Medienecho
Medienecho Juli 2025 Oliver Holtemöller: Wir versus Wirtschaft in: taz Die Tageszeitung, 01.07.2025 Juni 2025 Oliver Holtemöller: Eine Frage der Ideologie in: nd DER TAG,…
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Medienecho-Archiv 2021 2020 2019 2018 2017 2016 Dezember 2021 IWH: Ausblick auf Wirtschaftsjahr 2022 in Sachsen mit Bezug auf IWH-Prognose zu Ostdeutschland: "Warum Sachsens…
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Conditional Macroeconomic Survey Forecasts: Revisions and Errors
Alexander Glas, Katja Heinisch
Journal of International Money and Finance,
November
2023
Abstract
Using data from the European Central Bank's Survey of Professional Forecasters and ECB/Eurosystem staff projections, we analyze the role of ex-ante conditioning variables for macroeconomic forecasts. In particular, we test to which extent the updating and ex-post performance of predictions for inflation, real GDP growth and unemployment are related to beliefs about future oil prices, exchange rates, interest rates and wage growth. While oil price and exchange rate predictions are updated more frequently than macroeconomic forecasts, the opposite is true for interest rate and wage growth expectations. Beliefs about future inflation are closely associated with oil price expectations, whereas expected interest rates are related to predictions of output growth and unemployment. Exchange rate predictions also matter for macroeconomic forecasts, albeit less so than the other variables. With regard to forecast errors, wage growth and GDP growth closely comove, but only during the period when interest rates are at the effective zero lower bound.
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Das IWH auf der Jahrestagung des Vereins für Socialpolitik 2019 "30 Jahre Mauerfall" - Demokratie und Marktwirtschaft
IWH-BROWN-BAG-PANEL "Ost-West-Produktivitätslücke: Ursachen und Folgen" Ostdeutschlands Wirtschaft konnte anfänglich ihre Produktivität gegenüber den westdeutschen Verhältnissen…
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IWH Doctoral Programme in Economics
Warum ein Doktorandenstudium am IWH? Das IWH Doctoral Programme in Economics – one of the Top 20 places to do a PhD ( INOMICS Career Guide 2023 ) Am Leibniz-Institut für…
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Monetary Policy in an Oil-dependent Economy in the Presence of Multiple Shocks
Andrej Drygalla
Review of World Economics,
February
2023
Abstract
Russian monetary policy has been challenged by large and continuous private capital outflows and a sharp drop in oil prices during 2014. Both contributed to significant depreciation pressures on the ruble and led the central bank to give up its exchange rate management strategy. Against this background, this work estimates a small open economy model for Russia, featuring an oil price sector and extended by a specification of the foreign exchange market to correctly account for systematic central bank interventions. We find that shocks to the oil price and private capital flows substantially affect domestic variables such as inflation and output. Simulations for the estimated actual strategy and alternative regimes suggest that the vulnerability of the Russian economy to external shocks can substantially be lowered by adopting some form of inflation targeting. Strategies to target the nominal exchange rate or the ruble price of oil prove to be inferior.
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Monetary Policy through Exchange Rate Pegs: The Removal of the Swiss Franc-Euro Floor and Stock Price Reactions
Gregor von Schweinitz, Lena Tonzer, Manuel Buchholz
International Review of Finance,
Nr. 4,
2021
Abstract
The Swiss National Bank abolished the exchange rate floor versus the Euro in January 2015. Using a synthetic matching framework, we analyze the impact of this unexpected (and therefore exogenous) policy change on the stock market. The results reveal a significant level shift (decline) in asset prices following the discontinuation of the minimum exchange rate. As a novel finding in the literature, we document that the exchange‐rate elasticity of Swiss asset prices is around −0.75. Differentiating between sectors of the Swiss economy, we find that the industrial, financial and consumer goods sectors are most strongly affected by the abolition of the minimum exchange rate.
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Dilemma and Global Financial Cycle: Evidence from Capital Account Liberalisation Episodes
Xiang Li
IWH Discussion Papers,
Nr. 13,
2021
Abstract
By focusing on the episodes of substantial capital account liberalisation and adopting a new methodology, this paper provides new evidence on the dilemma and global financial cycle theory. I first identify the capital account liberalisation episodes for 95 countries from 1970 to 2016, and then employ an augmented inverse propensity score weighted (AIPW) estimator to calculate the average treatment effect (ATE) of opening capital account on the interest rate comovements with the core country. Results show that opening capital account causes a country to lose its monetary policy independence, and a floating exchange rate regime cannot shield this effect. Moreover, the impact is stronger when liberalising outward and banking flows.
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29.07.2021 • 20/2021
Kommunikation statt Konflikt – was weibliche CEOs für Hedgefonds interessant macht
Der Wert weiblich geführter Unternehmen wird durch die Intervention aktivistischer Investoren stärker erhöht als der von Unternehmen mit männlichen CEOs. Das geht aus einer aktuellen Veröffentlichung von Iftekhar Hasan (Fordham University und IWH) und Qiang Wu (Rensselaer Polytechnic Institute, RPI) am Leibniz Institut für Wirtschaftsforschung Halle (IWH) hervor. „Die Ergebnisse zeigen, dass weibliche CEOs aufgrund ihrer starken kommunikativen und zwischenmenschlichen Fähigkeiten besonders von der Intervention von aktivistischen Hedgefonds profitieren“, erklärt Iftekhar Hasan. Denn im Durchschnitt erhöht das Eingreifen eines aktivistischen Hedgefonds den Wert des Unternehmens ex post. Um das zu erreichen, setzen aktivistische Hedgefonds wie Carl Icahn, Trian Fundmanagement oder Elliott bevorzugt auf Kommunikation und Kooperation mit dem Management.
Reint E. Gropp
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