negative values

  1. E

    Negative Confidence Interval

    3. In two wards for elderly women in a nursing home the following levels of hemoglobin were found: Ward A: 12.2, 11.1, 14.0, 11.3, 10.8, 12.5, 12.2, 11.9, 13.6, 12.7, 13.4, 13.7 grams/dl Ward B: 11.9, 10.7, 12.3, 13.9, 11.1, 11.2, 13.3, 11.4, 12.0, 11.1 g/dl Ward A Ward B n = 12 n =...
  2. S

    How can log link still allow negative predicted values?

    I have been attempting to get a meaningful outcome of my data for months, and could really do with some help where to go next. I am attempting to fit a model based on past cost data. y = Total ($/ha/year) (all positive, min = 0.02, max = 2773.05) x1 = Area (ha) x2 = Continent (factor)...
  3. S

    Constant negative fitted values...am I missing something?

    Hello all, I'm attempting to fit a model where y variable is a variety of $/ha/year figures (all positive) ranging between 0.01 and 2520. The output of this should always have positive fitted values (none of these values should ever be below 0), and yet I get constant negative fitted values...
  4. R

    Multiple Imputation "cannot find an imputed value under the constraints for variable"

    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...