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Sequential Anova

I want to test the mean difference of Variable X between period 1 to 50 against period 51 to 178.(time series has two variables: period and X )

I used the following:

SAMP 1 50 Read (Data.dif) period1 X1 / DIF SAMP 51 178 Read (Data.dif) period2 X2 / DIF STAT X1 X2 / ANOVA

Error says:

                               HAS NO OBSERVATIONS IN SAMPLE RANGE

Thanks for your help

Sequential Anova

I want to test the mean difference of Variable X between period 1 to 50 against period 51 to 178.(time series has two variables: period and X )

I used the following:

SAMP 1 50
Read (Data.dif) period1   X1  / DIF
SAMP 51 178
Read (Data.dif) period2   X2 / DIF
STAT X1  X2  / ANOVA

ANOVA

Error says:

                               HAS NO OBSERVATIONS IN SAMPLE RANGE

Thanks for your help

click to hide/show revision 3
Added tag, formatted code

Sequential Anova

I want to test the mean difference of Variable X between period 1 to 50 against period 51 to 178.(time series has two variables: period and X )

I used the following:

SAMP 1 50
Read READ (Data.dif) period1   X1  / DIF
SAMP 51 178
Read READ (Data.dif) period2   X2 / DIF
STAT X1  X2  / ANOVA

Error says:

                               HAS NO OBSERVATIONS IN SAMPLE RANGE

Thanks for your help