The Role of Data Range in Linear Regression

• Type: Article in International Scientific Journal
• Date: 2017

Authors

Teresa Seixas (Author) FCUP; M. A. Salgueiro da Silva (Author) FCUP

Journal

Title: PHYSICS TEACHER

Vol. 55 No. 4

Pages: 371-372

ISSN: 0031-921X

Publisher: American Institute of Physics

Indexing

ISI Web of Knowledge - 12 Citations

Scopus - 12 Citations

Scientific classification

CORDIS: Social sciences > Educational sciences > Teaching methods

FOS: Social sciences > Educational sciences

Other information

Authenticus ID: P-00M-XP8

DOI: 10.1119/1.4999736

Abstract (EN): Measuring one physical quantity as a function of another often requires making some choices prior to the measurement process. Two of these choices are: the data range where measurements should focus and the number (n) of data points to acquire in the chosen data range. Here, we consider data range as the interval of variation of the independent variable (x) that is associated with a given interval of variation of the dependent variable (y). We analyzed the role of the width and lower endpoint of measurement data range on parameter estimation by linear regression. We show that, when feasible, increasing data range width is more effective than increasing the number of data points on the same data range in reducing the uncertainty in the slope of a regression line. Moreover, the uncertainty in the intercept of a regression line depends not only on the number of data points but also on the ratio between the lower endpoint and the width of the measurement data range, reaching its minimum when the dataset is centered at the ordinate axis. Since successful measurement methodologies require a good understanding of factors ruling data analysis, it is pedagogically justified and highly recommended to teach these two subjects alongside each other.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 2