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Dear classEx user,

In this forum you can post questions, report bugs or ask for support. You can also answer to questions of other user. The classEx team will provide help asap. If you have any questions, please write to classEx@uni-passau.de.

Best, the classEx Team

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For more information on the software, visit www.classEx.de

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11/5/25

Neighbors! Group Deal on Air Duct Cleaning – Save $100 (Only 2 Spots Left!)

Hey neighbors! I just booked a local tech for duct cleaning (regular price is $300) but he offered me

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Neighbors! Group Deal on Air Duct Cleaning – Save $100 (Only 2 Spots Left!)

Hey neighbors! I just booked a local tech for duct cleaning (regular price is $300) but he offered me

11/5/25

Philip O'Brien, Marcus Giamattei (classEx Team)4

10/7/25

Saving changes to parameters

Perfect. Thanks a lot Marcus! Phil On Tuesday, October 7, 2025 at 10:42:21 AM UTC+1 Marcus Giamattei

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Saving changes to parameters

Perfect. Thanks a lot Marcus! Phil On Tuesday, October 7, 2025 at 10:42:21 AM UTC+1 Marcus Giamattei

10/7/25

10/4/25

GROUP RATES FOR VENTS CLEANING SERVICES ,Just text/call/WhatsApp me at 321-780-3267

Anyone Interested in vent cleaning service? Interested people PM me with your house address and

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GROUP RATES FOR VENTS CLEANING SERVICES ,Just text/call/WhatsApp me at 321-780-3267

Anyone Interested in vent cleaning service? Interested people PM me with your house address and

10/4/25

Minxi Lin, Marcus Giamattei (classEx Team)2

8/15/25

Problem with $getNumRoles() function

Hej Minxi, I tried it and it works. It only does not work in the first stage of a game when people

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Problem with $getNumRoles() function

Hej Minxi, I tried it and it works. It only does not work in the first stage of a game when people

8/15/25

Shantayanan Devarajan

5/30/25

Trouble accessing classEx for public goods game

I am trying to get access to the links to use the public goods game in the CORE Economic Experience.

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Trouble accessing classEx for public goods game

I am trying to get access to the links to use the public goods game in the CORE Economic Experience.

5/30/25

Minxi Lin, Marcus Giamattei (classEx Team)2

5/13/25

Problem with Contract

Dear Minxi Li, barter trade may be a bit tricky with the contract element as everything in specific

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Problem with Contract

Dear Minxi Li, barter trade may be a bit tricky with the contract element as everything in specific

5/13/25

Jakob, Marcus Giamattei (classEx Team)4

4/1/25

How to display results in a table with self-defined categories

Hej Jakob, keep in mind, that the global program is executed before the subjects program is executed.

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How to display results in a table with self-defined categories

Hej Jakob, keep in mind, that the global program is executed before the subjects program is executed.

4/1/25

Minxi Lin, Marcus Giamattei (classEx Team)2

3/31/25

retrieving payoff variable from subject's side

Hej Minxi, I guess the problem is with the synchronization of stages. The global program is executed

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retrieving payoff variable from subject's side

Hej Minxi, I guess the problem is with the synchronization of stages. The global program is executed

3/31/25

Edward Perry, Marcus Giamattei (classEx Team)3

3/12/25

International Trade games

In the Repository you can find the following game: Gains from Trade - Robinson Crusoe V2 (if you

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International Trade games

In the Repository you can find the following game: Gains from Trade - Robinson Crusoe V2 (if you

3/12/25

2/13/25

Problem with data export

Hi classex team, I'm experiencing a problem with data export. When I download experiment's

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Problem with data export

Hi classex team, I'm experiencing a problem with data export. When I download experiment's

2/13/25

Revati Garde, … Suresh Govindapuram4

1/9/25

Public goods game: Number of participants

Similar Question I have! How do I make groups in the class? On Wednesday, December 8, 2021 at 8:39:08

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Public goods game: Number of participants

Similar Question I have! How do I make groups in the class? On Wednesday, December 8, 2021 at 8:39:08

1/9/25

11/25/24

random match with constant roles

Hi classex team, I'm trying to use the code you published here ://classex-doc.readthedocs.io/en/

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random match with constant roles

Hi classex team, I'm trying to use the code you published here ://classex-doc.readthedocs.io/en/

11/25/24

10/18/24

[Bug] Fatal error: Uncaught PDOException when trying to download data

Hello, I get the following error when trying to download the data of my experiment as Excel. Fatal

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[Bug] Fatal error: Uncaught PDOException when trying to download data

Hello, I get the following error when trying to download the data of my experiment as Excel. Fatal

10/18/24

Anke Leroux, nicolas...@economics-games.com2

10/9/24

Pollution, Taxes and Permits Game

For 3) Why not announce that there is a participation bonus that can be lost in case of negative

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Pollution, Taxes and Permits Game

For 3) Why not announce that there is a participation bonus that can be lost in case of negative

10/9/24

9/29/24

$findVariablePartner() does not retrieve correct values after regrouping

Hello, $findVariablePartner() does not retrieve correct values after regrouping participants using $

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$findVariablePartner() does not retrieve correct values after regrouping

Hello, $findVariablePartner() does not retrieve correct values after regrouping participants using $

9/29/24

Seraphina Biell, Marcus Giamattei (classEx Team)2

8/3/24

Dear Seraphina, yes, if you play them directly after each other, they keep their playerID. In

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Dear Seraphina, yes, if you play them directly after each other, they keep their playerID. In

8/3/24

Steffen Hoernig2

7/5/24

Cannot change folder names

Ok...solved. Instead of pressing "enter", just click somewhere else... On Friday, July 5,

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Cannot change folder names

Ok...solved. Instead of pressing "enter", just click somewhere else... On Friday, July 5,

7/5/24

ROSEMARIE CHARI NAGEL

6/2/24

can I copying games from one own account to another in classex?

Dear all, I have never posted a question here. Let's see whether it works. I have two classEX

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can I copying games from one own account to another in classex?

Dear all, I have never posted a question here. Let's see whether it works. I have two classEX

6/2/24

Ilaria Freddi, Marcus Giamattei (classEx Team)2

5/14/24

Number of loop repetitions

Hej Ilaria, unfortunately, this is currently not possible as it enters very deeply into the system

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Number of loop repetitions

Hej Ilaria, unfortunately, this is currently not possible as it enters very deeply into the system

5/14/24

Sheharyar Ahmed, … Christoph Steinmetz7

5/10/24

Repeating the Rounds

Dear Marcus, thanks for the help, I'll implement your tip. Best, Christoph Marcus Giamattei (

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Repeating the Rounds

Dear Marcus, thanks for the help, I'll implement your tip. Best, Christoph Marcus Giamattei (

5/10/24

Ariit Sengupta, Marcus Giamattei (classEx Team)2

4/7/24

Query regarding Image Insertion

Hej Ariit, you can use the img tag and include pictures via a webaddress. A file upload will be

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Query regarding Image Insertion

Hej Ariit, you can use the img tag and include pictures via a webaddress. A file upload will be

4/7/24

Ariit Sengupta, Marcus Giamattei (classEx Team)6

2/27/24

Ultimatum Game Error

Thank you so much Marcus, this solved the issue On Friday, February 23, 2024 at 3:09:09 PM UTC+5:30

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Ultimatum Game Error

Thank you so much Marcus, this solved the issue On Friday, February 23, 2024 at 3:09:09 PM UTC+5:30

2/27/24

Sheharyar Ahmed, Marcus Giamattei (classEx Team)2

1/5/24

query regarding $save

Dear Ahmed, did you make sure that the save function and findGroupSum are on different stages.

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query regarding $save

Dear Ahmed, did you make sure that the save function and findGroupSum are on different stages.

1/5/24

Sheharyar Ahmed, Marcus Giamattei (classEx Team)2

12/26/23

Query regarding $findvariablepartner

Dear Ahmed, you can find the information here: https://classex-doc.readthedocs.io/en/latest/

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Query regarding $findvariablepartner

Dear Ahmed, you can find the information here: https://classex-doc.readthedocs.io/en/latest/

12/26/23

Christian T, Marcus Giamattei (classEx Team)4

12/12/23

Randomly selecting participants

Hi Marcus, thank you very much. That solved the problem. Best, Christian Marcus Giamattei (classEx

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Randomly selecting participants

Hi Marcus, thank you very much. That solved the problem. Best, Christian Marcus Giamattei (classEx

12/12/23

6/12/23

mobile view and treatments

Dear forum, I have a couple of questions about Lioness. My first doubt concerns how the experiment is

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mobile view and treatments

Dear forum, I have a couple of questions about Lioness. My first doubt concerns how the experiment is

6/12/23

11/7/22

Single Button JavaScript change() function

Dear Marcus, I tried to calculate a new automatical output with JavaScript and thebutton elements. I

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Single Button JavaScript change() function

Dear Marcus, I tried to calculate a new automatical output with JavaScript and thebutton elements. I

11/7/22

Yuval Ofek-Shanny

9/20/22

Making some minor changes to exiting games - looking for paid help

Dear forum, My name is Yuval Ofek-Shanny. I am teaching introductory microeconomics (using Core) at

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Making some minor changes to exiting games - looking for paid help

Dear forum, My name is Yuval Ofek-Shanny. I am teaching introductory microeconomics (using Core) at

9/20/22

Erik Dern, m.gia...@berlin.bard.edu2

9/20/22

Start button feature skip stage

Dear Erik, thanks for reporting the bug. It has been fixed. Best, Marcus On Thursday, September 1,

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Start button feature skip stage

Dear Erik, thanks for reporting the bug. It has been fixed. Best, Marcus On Thursday, September 1,

9/20/22

Simon Müller, Marcus Giamattei5

8/31/22

Retrieving information about contracts which have not been accepted

Dear Marcus, This helps me a lot and solves my problem. I really appreciate this. Thank you very much

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Retrieving information about contracts which have not been accepted

Dear Marcus, This helps me a lot and solves my problem. I really appreciate this. Thank you very much

8/31/22

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