Created
May 9, 2014 21:02
-
-
Save smschauhan/8f4586320f0e32da107c to your computer and use it in GitHub Desktop.
scratchpad
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
## Setup up coordinate system (with x == y aspect ratio): | |
plot(c(-2,3), c(-1,5), type = "n", xlab = "x", ylab = "y", asp = 1) | |
## the x- and y-axis, and an integer grid | |
abline(h = 0, v = 0, col = "gray60") | |
text(1,0, "abline( h = 0 )", col = "gray60", adj = c(0, -.1)) | |
abline(h = -1:5, v = -2:3, col = "lightgray", lty = 3) | |
abline(a = 1, b = 2, col = 2) | |
text(1,3, "abline( 1, 2 )", col = 2, adj = c(-.1, -.1)) |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
## Simple Regression Lines: | |
require(stats) | |
sale5 <- c(6, 4, 9, 7, 6, 12, 8, 10, 9, 13) | |
plot(sale5) | |
abline(lsfit(1:10, sale5)) | |
abline(lsfit(1:10, sale5, intercept = FALSE), col = 4) # less fitting |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
z <- lm(dist ~ speed, data = cars) | |
plot(cars) | |
abline(z) # equivalent to abline(reg = z) or | |
abline(coef = coef(z)) |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
## trivial intercept model | |
abline(mC <- lm(dist ~ 1, data = cars)) ## the same as | |
abline(a = coef(mC), b = 0, col = "blue") |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
# scratch file |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment