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Peder M. Isager

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Introducing Causion: A web app for playing with DAGs Causion is a free web app for building causal diagrams (DAGs) and then watching them behave—by...
21st Jan 2026
1

Introducing Causion: A web app for playing with DAGs

from Peder M. Isager [alt+shift+b] in science

21st Jan 2026
Causion is a free web app for building causal diagrams (DAGs) and then watching them behave—by simulating data and switching from observation to intervention with do(). Try it now: https://causion.pedermisager.org/ (it runs in your browser)
Which variables to control for, and why In this post, we will use a practical example to explore the power of statistical control,...
17th Nov 2025
1

Which variables to control for, and why

from Peder M. Isager [alt+shift+b] in science

17th Nov 2025
In this post, we will use a practical example to explore the power of statistical control, explaining why adjusting for the right variables clarifies relationships and why adjusting for the wrong ones can introduce new, serious biases.
Why experiments are considered gold standard for answering causal questions In this blog post, I will briefly explain why experimental designs are considered so valuable by...
7th Aug 2025
1
7th Aug 2025
In this blog post, I will briefly explain why experimental designs are considered so valuable by scientists and why we often insist that randomized experiments are necessary for answering causal questions. I will use a practical example to illustrate this point. If you’re new to...
Eight basic rules for causal inference In this blog post I will describe eight basic rules that govern the relationship between causal...
13th Aug 2024
1

Eight basic rules for causal inference

from Peder M. Isager [alt+shift+b] in science

13th Aug 2024
In this blog post I will describe eight basic rules that govern the relationship between causal mechanisms in the real world and associations/correlations we can observe in data. To make each rule as easy as possible to understand, I will describe each rule both in words and in...
Four one-sided test of significance (FOST). Dear reader, does this make sense? In this blog post I propose a four one-sided test of significance (FOST) that can be used to test...
24th May 2024
1
24th May 2024
In this blog post I propose a four one-sided test of significance (FOST) that can be used to test whether an effect is smaller than OR larger than OR equivalent to the smallest effect size of interest. I lay out the general setup and interpretation of FOST, and ask readers to...
Why does correlation not equal causation? In this blog post I will explain why it makes sense to think about causal explanations when we see...
24th Nov 2023
1

Why does correlation not equal causation?

from Peder M. Isager [alt+shift+b] in science

24th Nov 2023
In this blog post I will explain why it makes sense to think about causal explanations when we see correlation, why correlation does not always imply causation, and which alternative causal models to consider when you are trying to figure out why two variables in your data are...
What is Worth Replicating? - SIPS 2020 Unconference session Given that most research is original and we have limited resources available for replication, we...
30th Jun 2020
1

What is Worth Replicating? - SIPS 2020 Unconference session

from Peder M. Isager [alt+shift+b] in science

30th Jun 2020
Given that most research is original and we have limited resources available for replication, we need guidelines for study selection in replication research. But what makes a study worth replicating? In our unconference session at SIPS this year, we had the pleasure of discussing...
Fifty ways to leave your model A method for calculating the number of alternative causal models, given a number of variables/nodes.
15th Feb 2020
1

Fifty ways to leave your model

from Peder M. Isager [alt+shift+b] in science

15th Feb 2020
A method for calculating the number of alternative causal models, given a number of variables/nodes.
Meta-research at the Psychological Science Accelerator Summary of unconference session at Tilburg Meta-research day 2019.
17th Dec 2019
1

Meta-research at the Psychological Science Accelerator

from Peder M. Isager [alt+shift+b] in science

17th Dec 2019
Summary of unconference session at Tilburg Meta-research day 2019.
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