File:R-car stopping distances 1920+quadratic.svg
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editDescriptionR-car stopping distances 1920+quadratic.svg |
English: A simple graph of car stopping distances, with a simple quadratic (zero intercept) fit and residual plot |
Date | |
Source | Own work |
Author | HYanWong |
using the following commands
svg("R-car_stopping_distances_1920+quadratic.svg", 8,4,8) layout(t(1:2)) par(mar=c(5, 4, 1, 2) + 0.1) cars$speed.kph <- cars$speed*1.609344 cars$dist.m <- cars$dist*0.3048 plot(dist.m ~ speed.kph, data=cars, xlab = "Speed (km/h)", ylab = "Stopping distance (m)", las = 1) quad.model <- lm(dist.m~I(speed.kph^2)-1, data=cars) curve(quad.model$coef[1] * x^2, col="red", add=TRUE) segments(cars$speed.kph, fitted.values(quad.model), cars$speed.kph, fitted.values(quad.model)+residuals(quad.model), col="lightblue") par(mar=c(5, 5, 1, 1) + 0.1) plot(residuals(quad.model), type="h", ylim=c(-25,25), bty="n", xaxt="n", las=2, xlab=NA, ylab="residual stopping distance (m)", col="lightblue") grid(NA, NULL) abline(h=0) points(residuals(quad.model)) dev.off()
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I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 22:44, 19 January 2009 | 720 × 360 (107 KB) | HYanWong (talk | contribs) | {{Information |Description={{en|1=A simple graph of car stopping distances, with a simple quadratic (zero intercept) fit and residual plot}} |Source=Own work by uploader |Author=HYanWong |Date=2008/12/13 |Permission= |other_versions= }} | |
10:54, 13 December 2008 | 360 × 360 (60 KB) | HYanWong (talk | contribs) | {{Information |Description={{en|1=A simple graph of car stopping distances, with a simple quadratic (zero intercept) fit}} |Source=Own work by uploader |Author=HYanWong |Date=2008/12/13 |Permission= |other_versions= }} {{Created with R}} |
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