biostatistics

  1. J

    Statistics for regional disease risk factors

    Hi, I've data set collected from 700 sheep farms from 5 regions of England (north, south, East, West, Central). The aim is find out if climate variables (maximum temperature, minimum temperature, rainfall) are predictors for animal disease in the regions, so the outcome variable (y) = number of...
  2. S

    Trying to analyze aggregated data

    Hi, I would like to know how it would be possible to make a t-test with aggregated data on SPSS or R. My dataset looks like this: Region......Question.....%positive.......%negative......n 1..............15...............20...................45............2956...
  3. J

    Regional analysis of disease risk factors

    I'm working with a large data set looking at climate variables e.g maximum, minimum temperature etc to see whether these could be risk factors for the regional variation for a sheep disease in 5 different regions within a country. The dependent variable is disease count (number of cases)...
  4. A

    How should I connect alleles?

    I am new at statistics and I have problem that I have no idea how to solve. I have biological data, which includes expression levels (130 patients) for different alleles (I'm analysing SNP's) of different genes (over 500 000 genes). First thing I did was finding those genes, for whom I have...
  5. P

    PAF through formula or through Conditional Logistic Regression

    Hi all, In a large registry dataset of psychiatric patients, if one wants to find the excess risk of schizophrenia patients developing depression, what would be the best method to apply: 1) Use the relevant formula to calculate PAF (Population Attributable Fraction). Formula can be...
  6. G

    Calculating a one-way anova with just means, stdev, and sample sizes

    Hi How can you determine the sum of squares total, sum of squares within and between, only knowing the mean, standard deviation and sample size of two groups e.g., group 1: mean 5.67 SD 3.055 sample size 3 group 2: mean 14.33 SD 2.081 sample size 3 Many thanks for any help and...
  7. N

    Calculate Incidence rate for disease with fertility/mortality data

    I am trying to calculate disease incidence in a certain country. I have the number of cases detected over 10 year period. The disease affects children mostly age 5 and younger, but my inclusion criteria are for children <10 years. I also have the country's fertility rates and child mortality...
  8. F

    Biostatistics opportunity in a new genomics company

    Offering an exciting opportunity for a biostatistician to join a rapidly growing genomics company based in Cambridge, UK If you have experience of developing predictive/prognostic algorithms, a knowledge of clinical genomic sequencing and a desire to make a real impact on the improvement of...
  9. J

    what stats to use?

    Dear All, As I am not experienced in stats I would like to ask for some stats suggestions for a study. study one: control impact with one impacted site and one reference site. Two species and biometrics taken. I need to see if the the impacted site increases biometrics. study two...
  10. C

    Project Issue.

    I am a student of statistics discipline. I have to conduct a project which i can apply in society or nation. My preferable topics are agricultural/technological/environmental statistics. But i am not understanding how can i specialize my topic, make it applicable and can have an ample online...
  11. M

    Help finding appropriate test when observations are non-independent

    I have a data set consisting of data from 7 islands. I have measured the average gene flow between each pair of islands as well as the difference in temperature between each pair of islands. I want to know whether these to variables (average gene flow and "thermal mismatch" are correlated)...
  12. P

    Help with kaplan meier analysis in SPSS

    HI! Thank you very much in advance for helping with my post! I am a phd student, I do surgical research at the carotid artery. My current project looks at plaque echolucency, which is a radiological finding on ultrasound examination. Your carotid artery can either be echolucent (1) or...
  13. D

    Using a grad class as a prereq for stat/biostat MS in a unique situation.

    Hello all, I guess I'll begin with my goal: to obtain an MS in stat/biostats in order to change careers. I do not intend to pursue education beyond the MS level. Also the schools I intend to apply to are not top tier, just solid regional schools where I'd like to settle. I have a unique...
  14. L

    Clustered data in SPSS

    How to insert an already-clustered data set in SPSS? I have a data set where there are repeated laboratory measurements for each patient, that is the patient is the cluster. How to inform SPSS that the patient ID variable is the "clustering" variable? Or is that not possible in SPSS ?
  15. P

    biostatistics for ordinal variable

    The study is perspective. the subject is : the effect of an intervention on antibiogram level I will have a antibiogram value at (4: for clean- 3 for a few- 2 for moderate and 1 for many bacteria) for each patient( 5 patient in every group, 10 patient in control and intervention groip)...
  16. W

    ?Pearson ?point-biserial correlatiom coefficient for relationship between variables

    Hi, I'm new on this forum, thanks for reading my post! I'm trying to figure out if I've used the best method for determining a relationship between variables (calculations done using Excel). I have a cohort of 38 trauma patients of different ages. I have measured their aortic diameter on...
  17. D

    When to use validation and derivation cohort?

    Hi everyone, I was wondering if there is any generic rules on when it's good to use a derivation and validation cohort on a dataset? So far I have only seen them being used for diagnostic tests. Also, if I use two datasets from two different studies to do this, do the datasets need to...
  18. I

    Which analysis to use for comparison of species proportions?

    I have samples of bee populations from 2011 and 2013. There were 5 different species collected. I need a test that can tell me if there is significant differences between proportions of species between years (ie, did one species start to decline and one species start to become more abundant)...
  19. W

    statistics.com PASS certificates?

    Hello everyone, glad to be part of this community! :wave: My background is in math and I am currently doing a post-doc in healthcare related research. I often do statistical analyses for work but have no formal education in statistics, therefore for my personal development and to show my...
  20. P

    Graduate certificate in biostatistics...worth it?

    Hello everyone glad to be on this forum. I am masters student, currently studying health sciences. Although the program's name is health sciences, most of my graduate training and courses have been in epidemiology, multivariate and univariate statistics and over the years I have become...