#statslearning

Putting this behind the cut mostly because I’m using my blog as a dumping ground but also as accountability for actually learning JASP :) 

Resource I’m using to learn JASP: 

https://jasp-stats.org/how-to-use-jasp/ 

Walk-through gif # 1 

Okay so it looks very much like SPSS but without the price tag 

Data still has to be organized the SPSS way though for ANOVAs

I like how it allows for toggling simple main effects though, because doing so in SPSS is a pain 

Walk through GIF # 2: examining interaction effects 

ok wait, it generates a graph then? 

it generates a graph AND the interaction information, which you can select for the models (I’m screaming this is actually really useful???)

In R I’d have to manually type it in and hope for the best, all the while really suffering re: learning how to graph in R. 

Should I learn how to graph in R? I’ll put that on my next self-learning schedule

Gif demonstration # 3: contrasts

Oh wow it even does contrasts

Are these based on t-tests with assumptions?

I wish these gifs came with a voiceover (for the first time in my life)

Are these e.g., bonferonni corrected?

I WISH I COULD PAUSE THE GIF HOLY 

Okay wait I see that you can select “Helmert” contrasts so I’m going to look that up 

“The idea behind Helmert contrasts is to compare each group to the mean of the “previous” ones. That is, the first contrast represents the difference between group 2 and group 1, the second contrast represents the difference between group 3 and the mean of groups 1 and 2, and so on”

.https://stats.libretexts.org/Bookshelves/Applied_Statistics/Book%3A_Learning_Statistics_with_R_-_A_tutorial_for_Psychology_Students_and_other_Beginners_(Navarro)/16%3A_Factorial_ANOVA/16.07%3A_Different_Ways_to_Specify_Contrasts#:~:text=The%20idea%20behind%20Helmert%20contrasts,and%202%2C%20and%20so%20on.

otherwise, okay, this is really good an option

GIF DEMONSTRATION # 4: POST-HOC ANALYSES

okay so the questions I had from gif 3 actually are for gif 4 

maybe it’s just been a long time since I’ve done stats but holy shit should I know the difference between a contrast and a post-hoc t-test?

Try # 1: this is supposed to explain the difference but went STRAIGHT over my head http://www-personal.umich.edu/~gonzo/coursenotes/file3.pdf 

 This source gives a better description https://www.graphpad.com/support/faq/difference-between-planned-comparisons-post-hoc-tests-multiple-comparison-tests--post-tests-and-orthogonal-comparisons/

Post-hoc test is used for situations where you can decide which comparisons you want to make after looking at the data. You don't need to plan ahead. Scenario I above clearly is post-hoc testing. Scenarios II and III above require that you make some decisions (based on your scientific goals). If you compare all pairs of means, you have decided not to do the more general comparisons listed in part I. If you choose to compare all against the mean, you've decided on scientific grounds not to compare treatment groups with each other, but only to compare each to the control. Because the use of these tests require some decisions that you should make before seeing any data, choices II and III are not strictly post-hoc tests, but that term sometimes gets used anyway

Planned comparison tests  require that you focus in on a few scientifically sensible comparisons. You can't decide which comparisons to do after looking at the data. The choice must be based on the scientific questions you are asking, and be chosen when you design the experiment. Hence the term planned comparisons. Scenario IV above is clearly planned comparisons. Scenarios II and III do require some planning, but are not usually lumped in with the term 'planned comparison test'.

It’s really whether the question was driven by theory and pre-planned.

Did you somehow find this helpful and interesting to read? A liveblog on me finally learning some of these stats skills on my own? Because I can’t seem to engage myself in self-learning stats unless I’m ~liveblogging~ the experience?!?!?!?

Well, I’m starting a few new stats to support and reward this experience, bc heck, learning stats on your own SUCKS:

https://ramyeonpng.tumblr.com/tagged/JASP ~ for JASP learning

https://ramyeonpng.tumblr.com/tagged/statslearning ~ for general stats learning