Topics covered in this session include:
- Continued work on Risk on / Risk off tool
- Preparing and merging two dataframes
- Rolling Correlation between 2 assets
- Histogram of rolling correlation
RiskOnOff.py
# -*- coding: utf-8 -*-
"""
Created on Sun Jan 5 11:02:36 2020
@author: Bruce1
"""
# =======================================================================
# Import Libraries
# =======================================================================
import pandas as pd
import pandas_datareader.data as web
from pathlib import Path
import matplotlib.pyplot as plt
#import numpy as np
# =======================================================================
# Setup Porgram Variables
# =======================================================================
symList = ['SPY', 'TLT']
startDate = '01/01/2000'
refreshData = False
lookback = 21
# =======================================================================
# Gather data function
# =======================================================================
def gatherData(sym, startDate):
#import pdb; pdb.set_trace()
savedFile = Path('./{}.xlsx'.format(sym))
if savedFile.exists() == False or refreshData == True:
print("")
print("-> Fetching data from the web")
df = web.DataReader(sym, data_source='yahoo', start=startDate)
print("")
print("-> Save data to file")
df.to_excel("{}.xlsx".format(sym))
else:
print("")
print("-> Fetching data from file")
df = pd.read_excel(savedFile, index_col='Date', parse_dates=True)
# =======================================================================
# Inspect/Report on data
# =======================================================================
firstIndex = df.index.min()
lastIndex = df.index.max()
records = len(df)
print("")
print("-> Importing ", sym)
print("First Date = ", firstIndex)
print("Last Date = ", lastIndex)
print("Total Days = ", records)
if df.isnull().values.any() == True:
print("WARNING: there are {} NaN in the data".format(df.isnull().values.sum()))
print(df.isnull().values)
return df
dfDict = {}
for sym in symList:
dfDict[sym] = gatherData(sym, startDate)
import pdb; pdb.set_trace()
# =======================================================================
# Format/Normalize Data
# =======================================================================
cdf = pd.DataFrame()
first = True
for sym in symList:
tdf = dfDict[sym].copy()
tdf.rename(columns={'Close':sym}, inplace=True)
if first:
cdf = tdf.loc[:,sym]
first = False
else:
cdf = pd.merge(cdf, tdf.loc[:,sym], left_index=True, \
right_index=True, how='inner')
import pdb; pdb.set_trace()
# =======================================================================
# Calculate Correlation
# =======================================================================
xdf = cdf.loc[:,symList[0]].rolling(lookback).corr(cdf.loc[:,symList[1]])
# =======================================================================
# Visualize Data
# =======================================================================
plt.figure()
t = 'Correlation of {}'.format(symList)
xdf.plot(kind='hist', bins=20, title = t)
plt.show()
cdf.to_excel('temp.xlsx')