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While the bussiness aid has an inclination on bussiness theories, the links are more scientific in nature.There are algorithms and quantitative methods used to back up and implement what the theory presents as important.You can choose a percentage and rate the sites you find here changing their sort order. If you know of a site with valuable and well presented science-inclined content you can e-mail me to include it on the links.
:o)

algorithms

32955%	Kardi Teknomo's Tutorials on math and algorithm	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
84.44%	Genetic algorithms, Biomorphs,Cellular automata	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
80%	Fundamentals of Neural Networks	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
55%	Types of Neural Networks	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%

business

85%	A/B test significance calculator	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
75%	Circular economy indicators	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
50%	Trust equation	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%

digital marketing

85%	Occam'sRazzzor blog	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
80%	Key Performance Indicators	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
75%	TargetInternet blog	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%

economics/finance

100%	A valuable source(papers,theory,index databases)	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
91%	The Inflation Monster-tutors booklet	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
89%	The Inflation Monster-pupil booklet	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
85%	Investopedia.Look for articles or use the chatbot	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
60%	Games on sustainability	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%

excel proficiency

100%	Excel Master Series	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
70%	Financial Resources	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
60%	Excel tutorials	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%

free courses

95%	Greek Universities Platform	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
90%	Stat Quest	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
90%	Socratica code&math	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
85%	Greekonomics Series	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
80%	Complexity Explorer	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
66.66%	Machine learning with SQL	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%

game theory

90%	The evolution of trust	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
90%	Game Theory Tutorial and Virtual Lab	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
65%	AI Safety for Fleshy Humans	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
55%	Fox's delta (d)	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
50%	Game theory(history of)	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%

Learning to code VBA

75%	Anthony's VBA Page for beginners and experts	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
60%	VBA with Cpearson for beginners and experts	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%

math-statistics

100%	Real-Statistics the Excel add-in	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
90%	Statistical Modeling and Forecasting	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
85%	Forecasting: Principles and Practice	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
85%	Random Function Improvement - Aliases	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
85%	Statistical Analysis Handbook	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
80%	3Blue1Brown	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
75%	Statology Blog & Guides	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
75%	Linear Programming	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
65%	Introduction to Econometrics with R	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
55%	Stats and Engineering handbook	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%

statistics & risk - software

90%	Monte Carlo Simulation in Excel	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
85%	Statistics with @Risk	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%
65%	Statistics with VOSE	0%5%10%15%20%25%30%35%40%45%50%55%60%65%70%75%80%85%90%95%100%