Hi,
I am attempting (and so far failing) to use multiple imputation in SPSS to fill blanks in my data set.
I ran the multiple impuation using the default settings and it worked fine except for the fact I was getting values way below my detection limits, some values were even negative! Following this I ran a custom multiple imputation (fully conditional specification) and set the constraints so that the detection limit was the minimum for imputed values for each variable. However, this resulted in a message stating:
"that after .... draws the imputation algorithm cannot find an imputed value under the constraints for variable .... Check minimum and maximum values specified to determine that they are reasonable and consider raising the number of draws allowed. Execution of this command stops"
So I ran the anaylsis again with values even less than the minimum detection level and increased the number of draws (for both case draws and parameter draws) but still no luck.
Does anyone know where I am going wrong? Any comments would be much appriciated, thanks.
I am attempting (and so far failing) to use multiple imputation in SPSS to fill blanks in my data set.
I ran the multiple impuation using the default settings and it worked fine except for the fact I was getting values way below my detection limits, some values were even negative! Following this I ran a custom multiple imputation (fully conditional specification) and set the constraints so that the detection limit was the minimum for imputed values for each variable. However, this resulted in a message stating:
"that after .... draws the imputation algorithm cannot find an imputed value under the constraints for variable .... Check minimum and maximum values specified to determine that they are reasonable and consider raising the number of draws allowed. Execution of this command stops"
So I ran the anaylsis again with values even less than the minimum detection level and increased the number of draws (for both case draws and parameter draws) but still no luck.
Does anyone know where I am going wrong? Any comments would be much appriciated, thanks.