Welcome to The Data Workshop! This project graphs points, which you enter, and finds and graphs equations for the data. Entering Data: Click "Enter Point" to enter a point of data. Enter your point as x,y. To delete one point, press "Delete Point" and type the item number as the point you want to delete. That item number will be deleted from both the x list and the y list. To delete all of the data, press "Clear All." Graphing Points: Your points will automatically be graphed after you enter them. The variables on the sides of the graph are maximum x and y values. Change these by using the sliders or by pressing "Enter" and typing the number. If a point has an x or y value that is too large for the graph it will not be graphed. For now, the minimum is always 0, but I may change that in a second version. You can choose whether to connect your points or not by pressing the green square next to "Connect Points." Finding Equations: When you press "Find Linear Eq," "Find Exponential Eq," or "Find Power Equation," it will find the equation of that type that fits the data best. If you press "Find Best Eq," it will figure out whether a linear, exponential, or power equation fits best and will show you that equation. The "Correlation Coefficient" shows how close the equation fits the data. The closer the absolute value is to 1, the better it is. Graph the Equation: Simply press "Graph Equation" to graph the equation. The equation is graphed in light blue. How It Works: This uses least- squares linear regression to find the equations. I've been looking for a simple explanation of linear regression online and I can't find one. So sorry, but you'll have to Google it yourself. If you find a good one, let me know and I'll post here. Improvements: There are no glitches that I know of, but if you find one, please let me know. I am planning on making a 2nd version, and I'll need suggestions. Here's a forum topic: http://scratch.mit.edu/forums/viewtopic.php?id=31049 And finally... Thanks so much for looking at my project. This project took me (by far) longer than any project I've ever made, so I'd appreciate feedback. I am always in need of tags so if you have any ideas for (relevant) tags, please add them. Thanks again and have a nice day! PS... It works kind of slow online, so you might want to download and put on Turbo Speed.
