When faced with a new classification problem, machine learning practitioners have a dizzying array of algorithms from which to choose: Naive Bayes, decision trees, Random Forests, Support Vector Machines, and...continue reading.
Map() is a convenient routine in Python to apply a function to all items from one or more lists, as shown below. This specific nature also makes map() a perfect...continue reading.
Below is a piece of Python code allowing to download option chains from NASDAQ website. It is basically a big function relying heavily on BeautifulSoup and wrapped into a class (‘c’est chic’)....continue reading.
»’ March 20h, 2016 update: the Eviews workfiles reader described below also works with Eviews9 workfiles. »’ On a side note … In the video below, I show in action the Eviews...continue reading.
Similar to rPython, the rPithon package (http://rpithon.r-forge.r-project.org) allows users to execute Python code from R and exchange the data between Python and R. However, the underlying mechanisms between these two...continue reading.
Below is a snippet to download the many data sets available on the US EIA‘s website (www.eia.gov). Required user’s inputs are a EIA token and the codes for the series one wants...continue reading.
Updated on Jan 3rd. 2016 – See at the bottom the code for Jupyter notebook 4.0.1 I was willing to pass on data contained in a quite big dataframe — specifically a pandas.DataFrame object...continue reading.
We needed up-to-date Malaysian crude palm oil production data. The MPOB provides such data on its website. It remained to write some ugly but somewhat reliable snippet code in Python, the latter...continue reading.
Removing records from a data table based on duplicate values in one or more columns is a commonly used but important data cleaning technique. Below shows an example about how...continue reading.
In [1]: import pandas as pd In [2]: import statsmodels.api as sm In [3]: data = pd.read_table(‘/home/liuwensui/Documents/data/csdata.txt’) In [4]: Y = data.LEV_LT3 In [5]: X = sm.add_constant(data[[‘COLLAT1’, ‘SIZE1’, ‘PROF2’, ‘LIQ’,...continue reading.
SQLite is a light-weight database with zero-configuration. Being fast, reliable, and simple, SQLite is a good choice to store / query large data, e.g. terabytes, and is well supported by...continue reading.
We all need a calculator from time to time. I used to reach to Start button, type Calc in the Run (or Search) box to get to Calculator app (Windows)....continue reading.
Artificial intelligence / Deep neural networks / Keras / R / R News / Spark
April 22, 2024
GIS / R / R News / Shiny / Visualization
Interactive visualization of geospatial data with R Shiny
April 17, 2021
