Correlation Websites
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Wessa.net - Free Statistics and Forecasting Software (Calculators) v.1.2.1
Wessa.net offers free educational forecasting software (time series analysis) and statistics software.
845,350 
$ 1,440.00
Math Dictionary
Visual Mathematics Dictionary www.education2000.com
3,353,334 $ 480.00
NLREG -- Nonlinear Regression Analysis Program
NLREG performs linear and nonlinear regression analysis and curve fitting. NLREG can handle linear, polynomial, exponential, logistic, periodic, and general nonlinear functions.
Not Applicable $ 8.95
PsychNet-UK - Mental Health, Counselling, Psychology and Psychiatry Portal
Mental Health and Psychology Portal. Article on mental health, where to get help, therapy resources, and professional and student information links.
Not Applicable $ 8.95