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%matplotlib inline
import numpy as np
import matplotlib.pyplot as plt
import pandas as pd
import seaborn as sns
sns.set();
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df = pd.read_csv("../data/cleaned_coalpublic2013.csv", index_col='MSHA ID')
df.head()
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len(df)
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for column in df.columns:
print column
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df.log_production.hist()
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df.Mine_Status.unique()
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df[['Mine_Status', 'log_production']].groupby('Mine_Status').mean()
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for column in df.columns:
print column
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df.Year.unique()
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features = ['Average_Employees',
'Labor_Hours',
]
categoricals = ['Mine_State',
'Mine_County',
'Mine_Status',
'Mine_Type',
'Company_Type',
'Operation_Type',
'Union_Code',
'Coal_Supply_Region',
]
target = 'log_production'
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fig = plt.subplots(figsize=(14,8))
sns.set_context('poster')
sns.violinplot(y="Mine_Status", x="log_production", data=df,
split=True, inner="stick", )
plt.tight_layout()
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fig = plt.subplots(figsize=(14,8))
sns.set_context('poster')
sns.violinplot(y="Company_Type", x="log_production", data=df,
split=True, inner="stick");
plt.tight_layout()
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df['Company_Type'].unique()
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pd.get_dummies(df['Company_Type']).sample(50).head()
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dummy_categoricals = []
for categorical in categoricals:
print categorical, len(df[categorical].unique())
# Avoid the dummy variable trap!
drop_var = sorted(df[categorical].unique())[-1]
temp_df = pd.get_dummies(df[categorical], prefix=categorical)
df = pd.concat([df, temp_df], axis=1)
temp_df.drop('_'.join([categorical, str(drop_var)]), axis=1, inplace=True)
dummy_categoricals += temp_df.columns.tolist()
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dummy_categoricals[:10]
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from sklearn.cross_validation import train_test_split
from sklearn.ensemble import RandomForestRegressor
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len(dummy_categoricals)
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train, test = train_test_split(df, test_size=0.3)
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rf = RandomForestRegressor(n_estimators=100, oob_score=True)
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rf.fit(train[features + dummy_categoricals], train[target])
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fig = plt.subplots(figsize=(8,8))
sns.regplot(test[target], rf.predict(test[features + dummy_categoricals]))
plt.ylabel("Predicted production")
plt.xlim(0, 22)
plt.ylim(0, 22)
plt.tight_layout()
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from sklearn.metrics import explained_variance_score, r2_score, mean_squared_error
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predicted = rf.predict(test[features + dummy_categoricals])
r2_score(test[target], predicted)
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explained_variance_score(test[target], predicted)
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mean_squared_error(test[target], predicted)
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rf_importances = pd.DataFrame({'name':train[features + dummy_categoricals].columns,
'importance':rf.feature_importances_
}).sort_values(by='importance',
ascending=False).reset_index(drop=True)
rf_importances.head(20)
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