# Comments¶

There is an errata page at the wavelet website maintained at the Program in Atmospheric and Oceanic Sciences, University of Colorado, Boulder, Colorado, which is accessible at http://paos.colorado.edu/research/wavelets/errata.html

## A Practical Guide to Wavelet Analysis¶

**Christopher Torrence and Gilbert P. Compo** (*Program in Atmospheric and
Oceanic Sciences, University of Colorado, Boulder, Colorado*)

### Errata¶

- Figure 3: N/(2 sigma^2) should just be N/sigma^2.
- Equation (17), left-hand side: Factor of 1/2 should be removed.
- Table 1, DOG, Psi-hat (third column, bottom row): Should be a minus sign

in front of the equation. - Sec 3f, last paragraph: Plugging N=506, dt=1/4 yr, s0=2dt, and dj=0.125 into Eqn (10) actually gives J=64, not J=56 as stated in the text. However, in Figure 1b, the scales are only plotted out to J=56 since the power is so low at larger scales.

### Additional information¶

Table 3: Cross-wavelet significance levels, from Eqn.(30)-(31). (DOF = degrees of freedom)

Significance level | Real wavelet (1 DOF) | Complex wavelet (2 DOF) |
---|---|---|

0.10 | 1.595 | 3.214 |

0.05 | 2.182 | 3.999 |

0.01 | 3.604 | 5.767 |