Comments for Statistical Analysis Consulting

Comment on Measuring change by Peter Flom

Peter Flom — Fri, 03 Feb 2012 22:39:58 +0000

Hi Michael
Depending on how many time points you have (is it one per year or many per year?) you might want time series analysis. It also depends on what other variables you have. If you just have range and time, then mixed models are not what you want.
Peter

Comment on Measuring change by Michael Kruger

Michael Kruger — Fri, 03 Feb 2012 17:30:25 +0000

I am trying to analyse chnages in a species range over a period of 20 years. I have a measure of the range for each year. But need to know if the range is declining or increasing and whether that is statistically significant. Is that something that the mixed models you are talking about could be used for? I have the SPSS package but am very confused by too many options. If you could point me in the right direction I would be grateful.

Thanks

Comment on How to ask a statistics question by no stats

no stats — Wed, 11 Jan 2012 19:44:58 +0000

Mr Flom
I am measuring two things in each group.

for example I am measuring level of X in blood of pregnant women and also measuring the same thing in their babies. My hypothesis is that levels of X in the blood will increase with Higher doses of Treatment A. What I meant by a continuous outcome is that my results are not fixed values (e.g may be 1 or 1.9 ). yes I will have two outcomes (in each group. and I want to compare the two outcome in each group with the control. I just do not know what statistical analysis I can use to come up with a P value .

Comment on How to ask a statistics question by Peter Flom

Peter Flom — Wed, 11 Jan 2012 19:15:29 +0000

I don’t understand. Why would increasing intake increase levels ? What levels? You ask if you r outcome is continuous, but you also say you have two outcomes….

Comment on How to ask a statistics question by no stats

no stats — Wed, 11 Jan 2012 15:09:15 +0000

Hi I am hoping some one can help me with my stats. I hoping to find that increasing intake of x will increase levels in subjects. I have 4 groups (1 control) and in each group I will be having two outcomes (measuring maternal levels of X and baby level of X). which statistical test I can use? I think my outcome variable is continuous. am I correct? and how will I know if I have a normal or skewed distribution? I appreciate it if some one can get back to me. thanks