例句與造句

1. then the paper investigated the regularity of different oil indices using time series statistical analysis method, which suggested that there are some regular components in it, including long-term secular trend, seasonal component and long-term cyclical component . the irregular component also plays an important part in it, mainly including the policy of opec, war, all kinds of international convention for the prevention of pollution from tankers and so on . and then a study of simulation and forecasting performance of arima time series model was conducted to crude oil indices, evidence shows that arima model performs better, especially for short-term forecasting
   在此基礎(chǔ)上，本文以時(shí)間序列分析作為基礎(chǔ)研究手段，以德國海運(yùn)費(fèi)率指數(shù)公布的1980年1月至1999年12月的四類油運(yùn)費(fèi)率指數(shù)為研究對(duì)象，分析了四類油運(yùn)費(fèi)率指數(shù)的長(zhǎng)期變化趨勢(shì)、季節(jié)變化規(guī)律、長(zhǎng)期周期循環(huán)變化規(guī)律和不規(guī)則變化規(guī)律，并應(yīng)用arima時(shí)間序列模型對(duì)160000dwt以上的原油運(yùn)費(fèi)率指數(shù)進(jìn)行了短期預(yù)測(cè)，取得了較好的預(yù)測(cè)效果。
2. It's difficult to find irregular component in a sentence. 用irregular component造句挺難的