Prediction of carbon dioxide emissions based on principal component analysis with regularized extreme learning machine: The case of China

Wei Sun, Jingyi Sun
2017 Environmental Engineering Research  
Nowadays, with the burgeoning development of economy, CO2 emissions increase rapidly in China. It has become a common concern to seek effective methods to forecast CO2 emissions and put forward the targeted reduction measures. This paper proposes a novel hybrid model combined principal component analysis (PCA) with regularized extreme learning machine (RELM) to make CO2 emissions prediction based on the data from 1978 to 2014 in China. First eleven variables are selected on the basis of Pearson
more » ... coefficient test. Partial autocorrelation function (PACF) is utilized to determine the lag phases of historical CO2 emissions so as to improve the rationality of input selection. Then PCA is employed to reduce the dimensionality of the influential factors. Finally RELM is applied to forecast CO2 emissions. According to the modeling results, the proposed model outperforms a single RELM model, extreme learning machine (ELM), back propagation neural network (BPNN), GM(1,1) and Logistic model in terms of errors. Moreover, it can be clearly seen that ELM-based approaches save more computing time than BPNN. Therefore the developed model is a promising technique in terms of forecasting accuracy and computing efficiency for CO2 emission prediction.
doi:10.4491/eer.2016.153 fatcat:zhvbck3bivhjzl7fyhtbljurya