Bulletin of the American Meteorological Society: Vol. 79, No. 1, pp. 61–78.

A Practical Guide to Wavelet Analysis

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


  • Figure 3: N/(2 sigma2) should just be N/sigma2.

  • 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=1/4yr, 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 levelReal wavelet (1 DOF)Complex wavelet (2 DOF)