Keys: on the standard plot, press 1 to 6 to pick a point. Press [ or ] to step through the points. Press an arrow key to move it one step. Hold Shift with an arrow key to move it five steps. Press Esc to let go.
reference linefirst and last pointsvertical gap
Semi-log plot
The semi-log form holds for C > 0. With C > 0, every y is positive.
Horizontal shift
Log-log plot
The log-log form holds for C > 0 and x > 0.
R
Standard plot
y = mx + b
No transformation is used on the standard plot.
Verdicts by plot type
Standard plot (x, y) linear
linear, y = mx + b
Semi-log plot (x, ln(y)) nonconstant linear
exponential, y = Cek(x−h)
Log-log plot (ln(x), ln(y)) nonconstant linear
power, y = Cxk
The model family whose plot is most nearly linear fits best. A horizontal line means a constant model.