The nonlinearity of monthly rainfall time series in Yunnan province is investigated by using the theory of complex system.

应用复杂系统理论和方法研究了云南地区月降雨量时序数据的非线性特性。

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Another theory is that monthly figures are more susceptible to short-term blips in the data.

BBC: 'Surprise' leap in card spending

But you can only buy copies of the songs--anyone who pays a monthly subscription fee, that in theory lets them listen to as much music as they want, can't listen to any of the late Beatle's songs in streaming audio.

FORBES: Music's Online Holdouts

"An insurer could contend that a subscription to 'Hang Gliding Monthly' is predictive of highly dangerous behavior, but I'm not buying that theory: The consumer may be getting the magazine for the pictures, " says Thomas Considine, New Jersey's commissioner of banking and insurance.

WSJ: Insurers Test Data Profiles to Identify Risky Clients