https://www.facebook.com/groups/bigdatastatistics/permalink/1933151076737646/

Is there any PDF or E-book which is helpful for beginners to learn Statistical concepts such as Regression , Clustering etc.

elementary statistics a step by step approach

Yeah, Introduction to Statistical Learning is a very good book. It is not heavy on the math, and takes more on hands-on approach (in R). if you want to know more of the math, try "Elements of Statistical Learning" by the same authors.

Introduction to statistical learning, and once you are done, elements of statistical learning + pattern recognition and machine learning (Bishop). First two are freely available online (PDF) - legally.

Links:
http://www-bcf.usc.edu/~gareth/ISL/
https://statweb.stanford.edu/~tibs/ElemStatLearn/
https://books.google.com.au/books/about/Pattern_Recognition_and_Machine_Learning.html?id=kTNoQgAACAAJ&source=kp_cover&redir_esc=y&hl=en

cheers

PS Only the first is for beginners. Sort of ...

cheers guys.

Petru Daniel Tudosiu  it really depends on your math background. ISL has much less material than ESL but is more pedagogical in nature with worked easy examples. If you feel strong in math, I suggest go directly to ESL (that's what I did as well), and if you need, check topics from ISL.

Also, alongisde what Foivos suggested (very good books)  I would add All of Statistics by Larry Wasserman (same level as elements of statistical learning)  and Python Machine Learning by Sebastican Raschka (good to learn to implement ML).

Additionally, it might be worth it to look into iPython/Jupyter notebooks or R markdown files that accompany some of these books. An example (easily found with Google): https://github.com/JWarmenhoven/ISLR-python

I found this reference to be much more appropriate than the canonical texts like Elements of statistical learning, which is not for beginners at all.

Data Science for Business strikes a nice balance between the foundational concepts and how to actually use them

https://books.google.com/books/about/Data_Science_for_Business.html?id=_1b4nAEACAAJ

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