Top Algorithms and Methods Used by Data Scientists

The following table shows usage of different algorithms types: Supervised, Unsupervised, Meta, and other by Employment type.
Table 1: Algorithm usage by Employment Type 

Employment Type	% Voters	Avg Num Algorithms Used	% Used Super- vised	% Used Unsuper- vised	% Used Meta	% Used Other Methods
Industry	59%	8.4	94%	81%	55%	83%
Government/Non-profit	4.1%	9.5	91%	89%	49%	89%
Student	16%	8.1	94%	76%	47%	77%
Academia	12%	7.2	95%	81%	44%	77%
All		8.3	94%	82%	48%	81%

Table 2: Top 10 Algorithms + Deep Learning usage by Employment Type

Algorithm	Industry	Government/Non-profit	Academia	Student	All
Regression	71%	63%	51%	64%	67%
Clustering	58%	63%	51%	58%	57%
Decision	59%	63%	38%	57%	55%
Visualization	55%	71%	28%	47%	49%
K-NN	46%	54%	48%	47%	46%
PCA	43%	57%	48%	40%	43%
Statistics	47%	49%	37%	36%	43%
Random Forests	40%	40%	29%	36%	38%
Time series	42%	54%	26%	24%	37%
Text Mining	36%	40%	33%	38%	36%
Deep Learning	18%	9%	24%	19%	19%

http://www.kdnuggets.com/2016/09/poll-algorithms-used-data-scientists.html/2