Month / enero 2015

by mlopezm

Online courses for Git and Github

For those interested in git and github:

https://www.udacity.com/course/ud775

The following 2 are very good:

http://www.dataschool.io/git-and-github-videos-for-beginners/   ….. Very good

and for the most common problems use this link….very very good

https://www.youtube.com/watch?v=h1e8oC7g0Ps&list=PL5-da3qGB5IBLMp7LtN8Nc3Efd4hJq0kD&index=11

https://www.coursera.org/course/datascitoolbox …. has some lessons on git and github

by mlopezm

Useful information to start with R

For those who start in R:

– First, install R : http://cran.rstudio.com
– Second and most important, install RStudio: http://www.rstudio.com/products/rstudio/download/
– Third, work always with RStudio. Provides a user interface quite similar to Matlab, and is very easy to use.
– Fourth, do this free online course: https://www.coursera.org/course/rprog

(the more energetics can do the complete series: https://www.coursera.org/specialization/jhudatascience/1?utm_medium=listingPage)
– Fifth, here you have reference information:

https://mlopezm.wordpress.com/2014/12/28/courses-to-learn-r/
but in the web you have tons of information about R.

– The last point, when you look up for information on google about R, use always R written as [R], otherwise you won’t have very useful results…..

…..good luck

by mlopezm

Using Python for data analysis, machine learning

Here is an excellent list of tools from python that you can use for your machine learning projects:

http://stats.stackexchange.com/questions/1595/python-as-a-statistics-workbench

extracted from this reference:

  • NumPy/Scipy You probably know about these already. But let me point out the Cookbook where you can read about many statistical facilities already available and the Example List which is a great reference for functions (including data manipulation and other operations). Another handy reference is John Cook’s Distributions in Scipy.
  • pandas This is a really nice library for working with statistical data — tabular data, time series, panel data. Includes many builtin functions for data summaries, grouping/aggregation, pivoting. Also has a statistics/econometrics library.
  • larry Labeled array that plays nice with NumPy. Provides statistical functions not present in NumPy and good for data manipulation.
  • python-statlib A fairly recent effort which combined a number of scattered statistics libraries. Useful for basic and descriptive statistics if you’re not using NumPy or pandas.
  • statsmodels Statistical modeling: Linear models, GLMs, among others.
  • scikits Statistical and scientific computing packages — notably smoothing, optimization and machine learning.
  • PyMC For your Bayesian/MCMC/hierarchical modeling needs. Highly recommended.
  • PyMix Mixture models.

If speed becomes a problem, consider Theano — used with good success by the deep learning people.

Information for the tools:

For Pandas:

http://pandas.pydata.org/pandas-docs/dev/10min.html

for a short summary on pandas:

http://www.bigdataexaminer.com/exploratory-data-analysis-in-python-using-pandas-matplotlib-and-numpy/

For Numpy/Scipy:

http://wiki.scipy.org/Cookbook

For GLM:

http://statsmodels.sourceforge.net/devel/examples/notebooks/generated/glm.html

Monte Carlo

http://pymc-devs.github.io/pymc/tutorial.html#

by mlopezm

Tensor analysis and introduction to tensors

This is an incredible series of lectures from Pavel Grinfeld:

and here is a whole series of lectures on linear algebra and tensor calculus from the same professor that is extraordinarily good

https://www.youtube.com/channel/UCr22xikWUK2yUW4YxOKXclQ/playlists

His is also this book:

http://www.amazon.es/Introduction-Tensor-Analysis-Calculus-Surfaces/dp/1461478669