Numworks: Statistics and Regression Tutorial
Introduction
Numworks has two modes for statistical calculations and plotting: Statistics and Regression. Each of the two modes can hold up to three sets of data, each having their own separate graph color (red for the 1st, blue for the 2nd, green for the 3rd).
Each mode has its own separate data, stored independently. As far as I know so far, none of the data points or results can be accessed in any other mode.
Navigation of the modes are controlled by the keypad. To change screens, keep press the up key until the header is selected.
Statistics
The Statistics mode deals with univariate data (one-variable). Two plots are offered:
* Histogram Plots. The bin width and starting point can be changed by pressing [ OK ] to bring up the options dialogue box.
* Box Plots. Data for each lists calculated are: minimum, 1st quarter, median, 3rd quarter, maximum
Regression
The Regression mode deals with bivariate data (two-variable). The data and it's scatterplot are automatically displayed on the Graph screen. The Data screen shows the mean, variance, and sums, along with regression model.
To change the regression, go to the Graph screen, scroll down to the regression model:
Linear: ax + b
Proportional: ax
Quadratic: ax^2+bx+c
Cubic: ax^3+bx^2+cx+d
Quartic: ax^4+bx^3+cx^2+dx+e
Logarithmic: a*ln x+b
Exponential: a*e^(bx)
Power: a*x^b
Trigonometric: a*sin(bx+c)+d
Logistic: c/(1+a*e^(-bx))
This menu will also to predict x and y values.
I hope you find this helpful, and highlight some of the other features of Numworks (other than Python).
Eddie
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