title: Python Finance: How to use macd indicator for signals strategy?
body: <p>I am trying to get my head around stock data and it's implementation in python. In starting I am using <em>MACD</em> indicator in Python <code>stockstats</code> library.</p>
  
  <p>Thing I want to know, if I have 100 OHLC entries of a certain stock, how can I use MACD output to produce signals whether I should Buy or Sell or Hold? In Graph one can visualize but in terms of programming how do I get the idea? Sample code given below:</p>
  
  <pre><code>import pandas as pd
  from stockstats import StockDataFrame as Sdf
  from pandas_datareader import data, wb
  
  data = pd.read_csv('data.csv')
  
  stock = Sdf.retype(data)
  print(stock.get('pdi'))
  </code></pre>
  
  <p>It produces output as given below:</p>
  
  <pre><code>0       0.000000e+00
  1      -8.951923e-08
  2       1.758777e-07
  3      -3.844324e-08
  4      -2.217396e-07
  5      -3.893329e-07
  6      -2.373225e-07
  7      -5.082528e-07
  8      -8.260595e-07
  9      -1.099751e-06
  10     -1.429675e-06
  11     -1.211562e-06
  12     -8.230303e-07
  13     -5.163039e-07
  14     -4.979626e-07
  15     -4.777865e-07
  16     -6.217018e-07
  17     -1.145459e-06
  18     -1.461550e-06
  19     -1.744250e-06
  20     -1.677791e-06
  21     -1.820319e-06
  22     -2.024092e-06
  23     -1.958413e-06
  24     -2.450087e-06
  25     -2.805521e-06
  26     -3.443776e-06
  27     -4.047889e-06
  28     -4.839084e-06
  29     -5.208106e-06
              ...     
  1410    4.856951e-06
  1411    6.075773e-06
  1412    9.159968e-06
  1413    9.985022e-06
  1414    1.069234e-05
  1415    1.140865e-05
  1416    1.136520e-05
  1417    1.156541e-05
  1418    1.065633e-05
  1419    9.176497e-06
  1420    9.275813e-06
  1421    8.254755e-06
  1422    7.583274e-06
  1423    7.301820e-06
  1424    6.959007e-06
  1425    6.292826e-06
  1426    8.411427e-06
  1427    8.746155e-06
  1428    1.112640e-05
  1429    1.299290e-05
  1430    1.398810e-05
  1431    1.441297e-05
  1432    1.509612e-05
  1433    1.462091e-05
  1434    1.436198e-05
  1435    1.390849e-05
  1436    1.419959e-05
  1437    1.554140e-05
  1438    1.884861e-05
  1439    2.163656e-05
  Name: macd, Length: 1440, dtype: float64
  </code></pre>