diff --git a/example/13-kor-momentum-portfolio.py b/example/13-kor-momentum-portfolio.py
index 82d3da1..8ee6a23 100644
--- a/example/13-kor-momentum-portfolio.py
+++ b/example/13-kor-momentum-portfolio.py
@@ -1,6 +1,8 @@
 import pandas as pd
 import matplotlib.pyplot as plt
 import seaborn as sns
+import statsmodels.api as sm
+import numpy as np
 import quantcommon
 
 # 모멘텀 포트폴리오. 최근 12개월 수익률이 높은 주식
@@ -51,4 +53,60 @@ g.set(ylabel=None)
 g.fig.set_figwidth(15)
 g.fig.set_figheight(8)
 plt.subplots_adjust(wspace=0.5, hspace=0.2)
+# plt.show()
+
+# k-ratio(모멘텀의 꾸준함 지표)
+ret = price_pivot.pct_change().iloc[1:]
+ret_cum = np.log(1 + ret).cumsum()
+
+x = np.array(range(len(ret)))
+y = ret_cum.iloc[:, 0].values
+
+reg = sm.OLS(y, x).fit()
+reg.summary()
+
+x = np.array(range(len(ret)))
+k_ratio = {}
+
+for i in range(0, len(ticker_list)):
+
+    ticker = data_bind.loc[i, '종목코드']
+
+    try:
+        y = ret_cum.loc[:, price_pivot.columns == ticker]
+        reg = sm.OLS(y, x).fit()
+        res = float(reg.params / reg.bse)
+    except:
+        res = np.nan
+
+    k_ratio[ticker] = res
+
+k_ratio_bind = pd.DataFrame.from_dict(k_ratio, orient='index').reset_index()
+k_ratio_bind.columns = ['종목코드', 'K_ratio']
+
+k_ratio_bind.head()
+
+data_bind = data_bind.merge(k_ratio_bind, how='left', on='종목코드')
+k_ratio_rank = data_bind['K_ratio'].rank(axis=0, ascending=False)
+print(data_bind[k_ratio_rank <= 20])
+
+k_ratio_momentum = price_list[price_list['종목코드'].isin(data_bind.loc[k_ratio_rank <= 20, '종목코드'])]
+
+plt.rc('font', family='Malgun Gothic')
+g = sns.relplot(data=k_ratio_momentum,
+                x='날짜',
+                y='종가',
+                col='종목코드',
+                col_wrap=5,
+                kind='line',
+                facet_kws={
+                    'sharey': False,
+                    'sharex': True
+                })
+g.set(xticklabels=[])
+g.set(xlabel=None)
+g.set(ylabel=None)
+g.fig.set_figwidth(15)
+g.fig.set_figheight(8)
+plt.subplots_adjust(wspace=0.5, hspace=0.2)
 plt.show()
\ No newline at end of file