statsmodels.discrete.count_model.ZeroInflatedNegativeBinomialResults.conf_int¶
-
ZeroInflatedNegativeBinomialResults.
conf_int
(alpha=0.05, cols=None)¶ Construct confidence interval for the fitted parameters.
- Parameters
- alpha
float
,optional
The significance level for the confidence interval. The default alpha = .05 returns a 95% confidence interval.
- colsarray_like,
optional
Specifies which confidence intervals to return.
- alpha
- Returns
- array_like
Each row contains [lower, upper] limits of the confidence interval for the corresponding parameter. The first column contains all lower, the second column contains all upper limits.
Notes
The confidence interval is based on the standard normal distribution if self.use_t is False. If self.use_t is True, then uses a Student’s t with self.df_resid_inference (or self.df_resid if df_resid_inference is not defined) degrees of freedom.
Examples
>>> import statsmodels.api as sm >>> data = sm.datasets.longley.load(as_pandas=False) >>> data.exog = sm.add_constant(data.exog) >>> results = sm.OLS(data.endog, data.exog).fit() >>> results.conf_int() array([[-5496529.48322745, -1467987.78596704], [ -177.02903529, 207.15277984], [ -0.1115811 , 0.03994274], [ -3.12506664, -0.91539297], [ -1.5179487 , -0.54850503], [ -0.56251721, 0.460309 ], [ 798.7875153 , 2859.51541392]])
>>> results.conf_int(cols=(2,3)) array([[-0.1115811 , 0.03994274], [-3.12506664, -0.91539297]])