# How to get all values from a PyMC3 parameter of shape \> 1?
**URL:** https://discourse.pymc.io/t/how-to-get-all-values-from-a-pymc3-parameter-of-shape-1/8284
**Category:** Questions
**Created:** [November 5, 2021, 10:46am UTC](https://discourse.pymc.io/t/how-to-get-all-values-from-a-pymc3-parameter-of-shape-1/8284 "2021-11-05T10:46:06Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Mreznik](https://discourse.pymc.io/u/Mreznik)
#### Post date: [November 5, 2021, 10:46am UTC](https://discourse.pymc.io/t/how-to-get-all-values-from-a-pymc3-parameter-of-shape-1/8284/1 "2021-11-05T10:46:06Z")
have built an unpooled model in PyMC3:
```auto
with pm.Model() as unpooled:
# PRIORS
alpha = pm.Uniform('alpha',lower=-5,upper=5, shape=len(set(Y.values)))
beta = pm.Normal('beta',mu=0,sd=1, shape=len(set(Y.values)))
sigma = pm.Uniform('sigma',lower=0.01,upper=3)
# LIKLIHOOD
e = X['flavanoids'].values * beta[Y.values.astype(int)] + alpha[Y.values.astype(int)]
y = pm.Normal('y',mu=e, sd=sigma, observed=Y.values)
# SAMPLE AND PLOT TRACE
trace = pm.sample(2000)
```
I know that if the shape of `beta` was 1, I could have gotten the max probability estimate using:
```auto
ppc = pm.fast_sample_posterior_predictive(trace, samples=1_0000, var_names=['beta'])
preds = ppc['beta'].mean(0)
```
but since the shape is more than 1, I should get more the 1 value for it. how can I extract that value?
---
### Author:  [@cluhmann](https://discourse.pymc.io/u/cluhmann)
#### Post date: [January 7, 2022, 3:38am UTC](https://discourse.pymc.io/t/how-to-get-all-values-from-a-pymc3-parameter-of-shape-1/8284/2 "2022-01-07T03:38:22Z")
Welcome. Sorry for the delayed response! Try this:
```python
index = 0
print((ppc['beta'][:,index]).mean())
```
If you instead work with an inferencedata object (e.g., `pm.sample(return_inferencedata=True)`) then you index things slightly differently. But the above work for the default MultiTrace object.
---
### Author:  [@almostmeenal](https://discourse.pymc.io/u/almostmeenal)
#### Post date: [January 19, 2022, 9:07am UTC](https://discourse.pymc.io/t/how-to-get-all-values-from-a-pymc3-parameter-of-shape-1/8284/3 "2022-01-19T09:07:09Z")
> [@cluhmann](#):
>
> return\_inferencedata=True
I’m not sure but I think we have changed the default return\_inferencedata as True and a warning is shown if True or False isn’t given already. Although I don’t remember if that’s a case of development version or v3