# biological statistics

1. ### Logistic Regression Stata: ommitted due to collinearity ?? Help

Hi there, I'm an MSc student in Medical Entomology and I'm in the midst of analysing data for my final project write up. My project is assessing the efficacy of different insecticide treatments applied in experimental huts against malaria mosquitoes. Now my dependent variables are: mortality...
2. ### iPod Track Listening & Biological Samples— Within-Subjects Test/Regression?

I am analyzing data in which participants listened to iPods and provided biological samples on the same days. The iPod Listening Intervention was 1 week. The biological sample collection was 4 days within the 1 week. There was no intervention/control group. All participants in study were given...
3. ### Calculating likelihood for a particular biological sample. Is is possible?

Hi you all! I've got a problem when trying to analyze some biological data in my PhD. Let's say that I'm interested in performing an analysis using observed values of a random variable (O), whose distribution is unknown, and their expected values (E) using a model like: Ei = k1 * exp ( - k2 ·...
4. ### Making sense of the parameter delta in this equation.

Hello, I was reading this paper about pollen dispersal directionality and I am trying to make sense of the so-called directionality parameter \delta The Statistical Model On pages 4 and 5 they explain their analysis under the section statistical procedure. More specifically, in the first...
5. ### Dependent variable from ratio counts. That's discrete? If yes, which test for low Ns?

Hi all, I have a rather specific question, I somehow don't seem to be able to find the answer to. So I work on biological tissue, where I count the number of cells that have been 'touched' by a particular axon. Meaning that my counts are ratios-percentages: dependent variable: 'percentages of...
6. ### Chi squared troubles

Okay, so i have been given an assignment in uni were they give us a set of data and we have to write up a scientific report. I have to perform a chi square test on the results in the hopefully attached table. I'm unsure about a couple of things: 1. Are my expected results obtained by using...
7. ### Comparing two groups of cells - Which test to use?

So I have a project to compare the formation of junctions of two groups of cell lines - a normal and a mutated one. I have number of junctions formed plotted against time for each group. For example: Normal cells have 3 junctions after 120 seconds, 6 junctions after 180 seconds... The mutated...
8. ### Best suitable statistics

Hi guys, I'm trying to see if different treatments can be related (or similars), although they are independent and unrelated treatments. Since I'm working with a parental toxin and some of its metabolites (which were used in distinct experiments), i was planning to relate them somehow and make...
9. ### Is Pearson correlation suitable for my analysis? Suggestions appreciated!

Hi guys, it's been weeks since I started to worry about my data analysis. I work with microarray data analysis, meaning that a have several datasets containing each one a bunch of genes (around 30-1034, depending on treatment). In my case I'm working with 5 independent treatments, namely 1. a...
10. ### Which analysis should i use? Rgeression or ANOVA or any ....

I am doing one analysis in Natural Science discipline: I have lots of data but know I don't know how can I analyze them. As I am not statistician: Could you please give an idea about what you think... See below the plan: 6xBlank (Control) Sampling purpose 1 Measures(GPD, VFA, NH4, N...
11. ### Comparing treatments over time - which test?

Hi, I have been trying to find the effect of different treatments on fruit decay. The experiment: Fruit was monitored for degradation over a ten day period. I scored each of 6 fruits in each punnet every day and there are six punnets per treatment. Each punnet is being treated as a...
12. ### Experiemntal design query

Hello. I have a pre-emptive biological statistics question, I wonder if you could help? I release 100 individuals into a room with a baited trap. Not all individuals are equally likely to to captured by the trap as they are not equally starved beforehand (and can't be, practically)...