-
Notifications
You must be signed in to change notification settings - Fork 234
New issue
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.
Already on GitHub? Sign in to your account
Is delta output symmetric? #618
Comments
Hello, thanks for the question @jaimsierra Could you share what we call an MWE (Minimum Working Example)? Some example code and data that we can use to reproduce the issue you're seeing? It is hard to comment without being able to see exactly what you are doing. That said: I dont have access to the paper right now, but I wonder if X and Y are meant to be model inputs and outputs? e.g., δ(Y, [var_a, var_b]) = δ([var_a, var_b], Y) |
Sure, thanks @ConnectedSystems:
|
In this example are Also, wrap your example with triple backticks (```) to format your code, like so: ```
|
Thanks @ConnectedSystems, changed! In the example, x and y are variables to use as input to a model in a latter stage and, according to the property I was referring to, mutually exchangeable as inputs. I'm trying to use the property to find out the level of dependence between variables (as δ(X,Y)=0 means X and Y are independent). |
Hi,
I'm using the Delta Moment-Independent Analysis with given data, checking a pair of variables at a time (a dependent one vs an independent one). Given this, and according to Plischke et al. (2013)**, who shows that delta is symmetric ( δ(Y,X) = δ(X,Y) ), I understood I should get same results for two combinations of, lets call them, var_a and var_b. I don't know if I am interpreting it well or not understanding anything, but trying to apply it I get significantly different results: δ(var_a,var_b)=0.313, δ(var_b,var_a)=0.703.
I am using the following function:
out=SALib.analyze.delta.analyze(problem,x,y,method='delta',conf_level=0.95,seed=92)
where x and y are both numpy.ndarray.
Do you have any idea why? Thanks for your help!
The text was updated successfully, but these errors were encountered: