小白新手的问题：

Based on the belowgeneral ADL model, produce the final ADL model for period of 1995-2010 usingthe general-to-specific process, to guarantee that all included variables leftin the final model are significant and consistent with economic theory. Rememberthat both one-off dummy variables and seasonal variables should be consideredto capture both one-off event impact and seasonality.

这是那个模型，等式右边还要加入被解释变量滞后变量……

The variable TA is the tourist arrivals in Hong Kong by American, income is the income of origin，and p is therelative price adjusted by exchange rate between the US and Hong Kong。The variables are on a quarterly basis.

然后eviews里面equation怎么写？怎么判断滞后多少阶……我照葫芦画瓢输入 ls TA c TA（-1）P P（-1） Income Income（-1）

然后软件显示 Ls is not defined。。

求大神帮助！可以发个红包表达感激QAQ

真的弄不明白。