This applet simulates a linear regression plot and the corresponding intercept and slope histograms. The program allows the user to change settings such as slope, standard deviation, sample size, and more.

Date Of Record Creation | 2006-06-02 13:26:00 |
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Date Last Modified | 2013-01-19 16:01:00 |

Date Of Record Release | 2006-06-02 13:26:00 |

Email Address | stefan.michiels@ucs.kuleuven.ac.be |

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Author Name | Stefan Michiels, Bert Raeymaekers |

Author Organization | University Center for Statistics, Katholieke Universiteit Leuven |

Comments | On some computers the window in which the applet appears may not fit on the screen making part of the material unviewable. |

Content Quality (Concerns) | This concept may not be used in many ntroductory courses. Also, this applet does not present the confidence interval for slopes or intercepts. |

Content Quality (Strengths) | This applet does a very good job of illustrating the normality of the sample slope (and ntercept) in a regression model, which is a moderately important idea. It also illustrates the "fan" effect--the regression line is more uncertain as the distance from the mean of the independent variable increases. |

Ease of Use (Concerns) | This applet lacks instructions. Although the buttons are clearly labeled, the lack of instructions requires some experimentation to understand the purpose. This applet loads in a new window that is behind the current browser window. Also, closing the initial browser window closes the applet which can be frustrating. |

Ease of Use (Strengths) | After you understand the controls, the applet is fairly easy to use and has nice graphics. |

Potential Effectiveness (Concerns) | When adding additional examples (new windows), having just two windows open results in misleading scales. Having one, three, or four windows open at a time does not result in this scale problem. There are no questions for the students to think about as they watch the demonstration and no context provided. An instructor using this item should provide a context to the students to help them understand what is being presented by this applet. |

Potential Effectiveness (Strengths) | Students can see the original regression line and then other regression lines as more samples are taken. Students can see the connection between a single sample result and the distribution. The new samples and regression lines can be added one at a time, added in "slow motion" (walk), or added quickly (run). |

Source Code Available | On |

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