I am a psychologist and I have the following question:

So, last year I was running a study. I intended to collect at least 400 participants (the anticipated effect size was hard to estimate). The study was an experiment with 6 conditions (2 (self vs other) x 3 (situation with 3 different levels)) and I was interested in a 3-way interaction (self_vs_other x situation x personality trait) in a multiple hierarchical regression.

My data collection got terminated midway because the Institute closed the surveymonkey account. I ended up with 236 participants. I calculated results and found what I was looking for. The interaction alone explains 4.3% of variance and is of size eta_squared =.094 which means it's somewhere between medium and large. Based on post-hoc analysis, I had 89% power to detect this effect.

But I am unsure about sample size. Someone might say it's too small for a study with a 3-way interaction.

Now, can I simply report the post-hoc power analysis in a paper and claim that it's ok? Or should I rather resume collection (on a different site and in a different situation: during covid pandemic...)?

Thank you all in advance for your input.

I am a psychologist and I have the following question:

Last year I was running a study. I intended to collect at least 400 participants (the anticipated effect size was hard to estimate). The study was an experiment with 6 conditions (2 (self vs other) x 3 (situation with 3 different levels)) and I was interested in a 3-way interaction (self_vs_other x situation x personality trait) in a multiple hierarchical regression.

My data collection got terminated midway because the Institute closed the surveymonkey account. I ended up with 236 participants. I calculated results and found what I was looking for. The interaction alone explains 4.3% of variance and is of size eta_squared =.094 which means it's somewhere between medium and large. Based on post-hoc analysis, I had 89% power to detect this effect.

But I am unsure about sample size. Someone might say it's too small for a study with a 3-way interaction.

Now, can I simply report the post-hoc power analysis in a paper and claim that it's ok? Or should I rather resume collection (on a different site and in a different situation: during covid pandemic...)?

Thank you all in advance for your input.

I am a psychologist. I have the following question.

So, last year I was running a study. I intended to collect at least 400 participants (it was difficult to estimate an anticipated effect size but they are usually small-to-medium in personality psychology). The study was an experiment with 6 conditions (2(me vs other) x 3(situation with 3 different levels)) and I was interested in a 3-way interaction (self_vs_other x situation x personality trait). My data collection got terminated midway because the Institute closed the surveymonkey account. I ended up with 236 participants. I calculated results and found what I was looking for. The interaction alone explains 4.3% of variance, is significant and is of size eta_squared =.094 which means it's somewhere between medium and large. The results are interesting.

But I am unsure about sample size. Someone might say it's too small for a study with a 3-way interaction. Now, can I simply report a post-hoc power analysis in a paper and claim that it's ok? Or should I rather resume collection (on a different website and in a different situation: during covid pandemic...)? Thanks a lot in advance for all your input!

I am a psychologist and I have the following question:

So, last year I was running a study. I intended to collect at least 400 participants (the anticipated effect size was hard to estimate). The study was an experiment with 6 conditions (2  (self vs other) x 3  (situation with 3 different levels)) and I was interested in a 3-way interaction (self_vs_other x situation x personality trait) in a multiple hierarchical regression.

My data collection got terminated midway because the Institute closed the surveymonkey account. I ended up with 236 participants. I calculated results and found what I was looking for. The interaction alone explains 4.3% of variance and is of size eta_squared =.094 which means it's somewhere between medium and large. Based on post-hoc analysis, I had 89% power to detect this effect.

But I am unsure about sample size. Someone might say it's too small for a study with a 3-way interaction.

Now, can I simply report the post-hoc power analysis in a paper and claim that it's ok? Or should I rather resume collection (on a different site and in a different situation: during covid pandemic...)?

Thank you all in advance for your input.