Replication Dertwinkel-Kalt and Köster (2020, JEEA)

Last registered on July 29, 2021


Trial Information

General Information

Replication Dertwinkel-Kalt and Köster (2020, JEEA)
Initial registration date
May 21, 2021
Last updated
July 29, 2021, 2:09 PM EDT


Primary Investigator

Central European University

Other Primary Investigator(s)

PI Affiliation
University of Konstanz

Additional Trial Information

Start date
End date
Secondary IDs
We replicate Experiment 2 in Dertwinkel-Kalt and Köster, "Salience and Skewness Preferences", Journal of the European Economic Association 18(5), 2020, 2057-2107, using a different subject pool. We implement an additional treatment from Loewenfeld and Zheng (2021) that allows us to control for so-called event-splitting effects.
External Link(s)

Registration Citation

Dertwinkel-Kalt, Markus and Mats Köster. 2021. "Replication Dertwinkel-Kalt and Köster (2020, JEEA)." AEA RCT Registry. July 29.
Experimental Details


In a within-subjects design, we study in how far the choice between a right-skewed and a left-skewed lottery (with the same expected value and the same variance) depends on the correlation of these lotteries and how the correlation interacts with the level of absolute skewness.

In a between-subjects design, we further control for event-splitting effects, as proposed by Loewenstein and Zheng (2021).
Intervention Start Date
Intervention End Date

Primary Outcomes

Primary Outcomes (end points)
Proportion of preference reversals from the right-skewed lottery under negative correlation to the left-skewed lottery under positive correlation.
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
Each individual makes twelve binary decisions in random order. In each decision the subject chooses between two lotteries that form a Mao pair. A Mao pair is uniquely defined by its expected value (E), its variance (V), its absolute skewness (S), and its correlation structure. One of the lotteries is right-skewed and the other one is left-skewed. We use six different Mao pairs, three of which are rather skewed (i.e., S = 2.7) with E=36 and V=144, with E=72 and V=576, and with E=108 and V=1296, while the remaining three are rather symmetric (i.e, S = 0.6) again with E=36 and V=144, with E=72 and V=576, and with E=108 and V=1296. For each Mao pair subjects choose between the right-skewed and the left-skewed lottery both under perfectly negative correlation and under maximal positive correlation. In one treatment we present the perfectly negatively correlated Mao lotteries in "reduced form", while in the other treatment we artificially split up one of the states to control for event-splitting effects.
Experimental Design Details
Randomization Method
Randomization is done by the computer
Randomization Unit
Was the treatment clustered?

Experiment Characteristics

Sample size: planned number of clusters
220 individuals (110 individuals per treatment)
Sample size: planned number of observations
1320 paired choices (660 paired choices per treatment)
Sample size (or number of clusters) by treatment arms
In each treatment: 330 paired choices for symmetric Mao pairs, 330 paired choices for skewed Mao pairs
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
See Dertwinkel-Kalt and Köster (2020) for details

Institutional Review Boards (IRBs)

IRB Name
IRB Approval Date
IRB Approval Number


Post Trial Information

Study Withdrawal

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Is the intervention completed?
Intervention Completion Date
May 23, 2021, 12:00 +00:00
Data Collection Complete
Data Collection Completion Date
May 23, 2021, 12:00 +00:00
Final Sample Size: Number of Clusters (Unit of Randomization)
102 subjects in the replication treatment and 112 subjects in the event-splitting treatment.
Was attrition correlated with treatment status?
Final Sample Size: Total Number of Observations
612 paired choices in the replication treatment and 672 paired choices in the event-splitting treatment.
Final Sample Size (or Number of Clusters) by Treatment Arms
306 paired choices for symmetric and skewed Mao pairs in the replication treatment, respectively, and 336 paired choices for symmetric and skewed Mao pairs in the event-splitting treatment, respectively.
Data Publication

Data Publication

Is public data available?

Program Files

Program Files
Reports, Papers & Other Materials

Relevant Paper(s)

Reports & Other Materials