I think you should use Schwarz information criteria while determining optimal lag length.
Your model is incorrect. Moreover, you should apply bound test and determine that your F statistic is greater than bound values. I this is the case, you should estimate long-run and short-run coefficients in Eviews
Your all values are NA. This is a meaningless expression. Instead, there should be numbers. Moreover, if you apply bounds test and determine your F statistic is greater than critical values then you can conclude that your model is correct. You can apply all of these in Eviews 9. You can get information from youtube videos
yes i see the ARDL bound result my result is crtical value is high reagrding 1(0) 1(1) at 1% and level at 5% so next setp is nad p value also less then 1
EC = LNCO2 - (-0.2342*LNEP + 0.4587*LNGCF -4.2385*LNG + 2.3186*LNGDP + 0.5313*LNT -42.4747) this is my ARDL equation but i have little bit difficulty to exlpian it.plzz give some sugestion to improve my theoretical work with the help of explanation.