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  2. A parking rule built on four hotels is guesswork, not evidence.
?WHY IS
RENT HIGH?
Parking mandates

A parking rule built on four hotels is guesswork, not evidence.

The published relationship is weak: the four observations scatter widely around the fitted line.

REDRAWN FROM STUDY DATAFigure 1 · Parking generation by non-convention hotels
Figure 1 · Parking generation by non-convention hotelsThe published relationship is weak: the four observations scatter widely around the fitted line. Four plotted observations digitized from Figure 1; fitted line uses the printed equation P = 0.33X + 36 (R² = 0.089).507090110130Peak occupied parking spacesHotel rooms100150200250Printed fitted line
Figure 1 · Parking generation by non-convention hotels. Four plotted observations digitized from Figure 1; fitted line uses the printed equation P = 0.33X + 36 (R² = 0.089).
Hotel roomsPeak occupied parking spaces
150102
18454
206110
209124

Source: Shoup (1997) · Figure 1; PDF p. 3

Data: Four plotted observations digitized from Figure 1; fitted line uses the printed equation P = 0.33X + 36 (R² = 0.089).

Keep in mind: The figure itself warns that the sample is small and the fit is weak (R² = 0.089). It illustrates a measurement problem rather than a causal estimate.

Share the evidence

A parking rule built on four hotels is guesswork, not evidence.

The published relationship is weak: the four observations scatter widely around the fitted line.

Source
Shoup (1997)
Figure
Figure 1 · Parking generation by non-convention hotels · Figure 1; PDF p. 3
Redraw data
Four plotted observations digitized from Figure 1; fitted line uses the printed equation P = 0.33X + 36 (R² = 0.089).
Keep in mind
The figure itself warns that the sample is small and the fit is weak (R² = 0.089). It illustrates a measurement problem rather than a causal estimate.
View values used in redraw
Values used to redraw Figure 1 · Parking generation by non-convention hotels
Hotel roomsPeak occupied parking spaces
150102
18454
206110
209124
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?WHY IS
RENT HIGH?

Too many people are chasing too few homes. See why—and what communities can do about it.

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