# slimp: linear models with Stan and Pandas
*slimp* estimates linear models using [Stan](https://mc-stan.org/) and [Pandas](https://pandas.pydata.org/). Think [rstanarm](https://mc-stan.org/rstanarm/) or [brms](https://mc-stan.org/users/interfaces/brms), but in Python and faster.
Create the model:
```python
import matplotlib.pyplot
import numpy
import pandas
import slimp
y, x = numpy.mgrid[0:10, 0:10]
z = 10 + x + 2*y + numpy.random.normal(0, 2, (10, 10))
data = pandas.DataFrame({"x": x.ravel(), "y": y.ravel(), "z": z.ravel()})
model = slimp.Model("z ~ 1 + x + y", data, num_chains=4)
# Also possible to specify random seed
# model = slimp.Model("z ~ 1 + x + y", data, seed=42)
```
Sample the parameters, check the results:
```python
model.sample()
print(model.hmc_diagnostics)
print(model.summary()[["N_Eff", "R_hat"]].describe().loc[["min", "max"], :])
r_squared = slimp.r_squared(model)
print(r_squared.quantile([0.05, 0.95]))
```
Plot prior and posterior predictive checks:
```python
figure, plots = matplotlib.pyplot.subplots(1, 2, layout="tight", figsize=(8, 4))
slimp.predictive_plot(model, use_prior=True, plot_kwargs={"ax":plots[0]})
slimp.predictive_plot(model, use_prior=False, plot_kwargs={"ax":plots[1]})
```
Plot the credible intervals of the parameters and their distributions:
```
slimp.parameters_plot(model, include=["x", "y"])
slimp.KDEPlot(model.draws["sigma"], prob=0.90)
```
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"description": "# slimp: linear models with Stan and Pandas\n\n*slimp* estimates linear models using [Stan](https://mc-stan.org/) and [Pandas](https://pandas.pydata.org/). Think [rstanarm](https://mc-stan.org/rstanarm/) or [brms](https://mc-stan.org/users/interfaces/brms), but in Python and faster.\n\nCreate the model:\n\n```python\nimport matplotlib.pyplot\nimport numpy\nimport pandas\nimport slimp\n\ny, x = numpy.mgrid[0:10, 0:10]\nz = 10 + x + 2*y + numpy.random.normal(0, 2, (10, 10))\ndata = pandas.DataFrame({\"x\": x.ravel(), \"y\": y.ravel(), \"z\": z.ravel()})\n\nmodel = slimp.Model(\"z ~ 1 + x + y\", data, num_chains=4)\n# Also possible to specify random seed\n# model = slimp.Model(\"z ~ 1 + x + y\", data, seed=42)\n```\n\nSample the parameters, check the results:\n\n```python\nmodel.sample()\nprint(model.hmc_diagnostics)\nprint(model.summary()[[\"N_Eff\", \"R_hat\"]].describe().loc[[\"min\", \"max\"], :])\nr_squared = slimp.r_squared(model)\nprint(r_squared.quantile([0.05, 0.95]))\n```\n\nPlot prior and posterior predictive checks:\n\n```python\nfigure, plots = matplotlib.pyplot.subplots(1, 2, layout=\"tight\", figsize=(8, 4))\nslimp.predictive_plot(model, use_prior=True, plot_kwargs={\"ax\":plots[0]})\nslimp.predictive_plot(model, use_prior=False, plot_kwargs={\"ax\":plots[1]})\n```\n\nPlot the credible intervals of the parameters and their distributions:\n\n```\nslimp.parameters_plot(model, include=[\"x\", \"y\"])\nslimp.KDEPlot(model.draws[\"sigma\"], prob=0.90)\n```\n",
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