How to plot trace of an interaction

[TabithaSteendam]

Hello,

Is it possible to plot traces of an interaction?
If I run az.plot_trace(infer_m) I get a memory error, so I plot all parameters separately.
But when I try to plot the interaction, I get the following error:

az.plot_trace(infer_m.posterior.a_phone|half)
Traceback (most recent call last):

Cell In[19], line 1
az.plot_trace(infer_m.posterior.a_phone:half)

NameError: name 'half' is not defined

This is my code:

m = hssm.HSSM(
    data=data2,
    #loglik_kind="blackbox",
    model="ddm",# options are:"ddm", "ddm_sdv","full_ddm", "angle", "levy", "ornstein", "weibull", "race_no_bias_angle_4", "ddm_seq2_no_bias".
    z=0.3,
    include=[# parameter specifications to include in the model
        {
            "name": "v",  
            "prior": {
                "Intercept": {"name": "Normal", "mu": 0, "sigma": 2},                
            },
            "formula": "v ~ 1 + phone*half",
            "link": "identity",
        },
        {
            "name": "a",  
            "prior": {
                "Intercept":  {"name": "HalfNormal", "sigma": 2},                
            },
            "formula": "a ~ 1 + phone*half",    
            }, 
        {
            "name": "t",  
            "prior": {
                "Intercept":  {"name": "HalfNormal", "sigma": 2,"initval":.01},                
            },
            "formula": "a ~ 1 + phone*half",    
            },
       ],
)


infer_m = m.sample(
    sampler="nuts_numpyro",chains=4, cores=1, draws=5000, tune=3000)

az.plot_trace(infer_m.posterior.a_phone:half)

[digicosmos86]

Hi, can you try az.plot_trace(infer_m.posterior["a_phone:half"]? Because of the colon, the dot notation does not work.

[TabithaSteendam]

That worked, thank you!