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sorry I mistakenly wrote "at level" instead of writting "at first difference", hope you understand, at first difference the series is stationary.

also For unit root, I have got the correct results like at level all the 3 variables are non-stationay and at level they are stationary, means the variables are integrated of order 1, now the cointegration technique can be applied as all the series are integrated of order 1.

Thank you so much for explaining in detail, but my problem is still there. I am using both Engle Granger and Johansons, but while applying cointegration test I got message of singular matrix, but when I omit the trend means click the option for no deterministic trend it gives 1 cointegrating equatio...

Hello, I am working on Error correction modeling, three variables and I need help as I got clear results for ADF test on level and first difference but while applying cointegration I got the message as; singular matrix but when i click the option for no intercept and trend, it gives me 1 cointegrati...