An Effective News Recommendation Method for Microblog User

Figure 5

Periodogram of the popularity degree of college entrance examination subclass. Remark. 𝑥-axis denotes the possible frequency of the popularity degree; 𝑦-axis represents the energy of the corresponding frequency.

(a) The complete periodogram with its frequency range is from 0 to 0.05

(b) Local amplification periodogram with the frequency range is from 1 to 0.05