# Biostatistics Jobs

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## Biostatistician needed for analysis

Fixed-Price - Expert (\$\$\$) - Est. Budget: \$100 - Posted
I am in need of a biostatistician to complete a project in SAS. Project entails the following: 1. fitting of regression models with epidemiological data, inclusion of the steps and investigating the association of interest, after adjusting for potential confounders and dealing with any effect modifiers. 2. Similar to #1 but different data with different focus All coding must be done in SAS and be able to be explained in a written format. Please contact me for specifics if you are interested.
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## Determine an algorithm that allows us to recalculate percentile rank in a set

Fixed-Price - Intermediate (\$\$) - Est. Budget: \$5 - Posted
We need an algorithm that can handle the following use case. Let's suppose I have a set {​n1.......ni}​ and I compute the percentile rank. I want an algorithm that allows me to replace one or more values in the set (i.e. remove set member n5 and replace it with n9. Rather than re-compute the percentile rank across the whole set, I do the following: 1. compare the value the value replaced with the new value 2. based on some difference between the values adjust the percentile rank This can be defined in a statistical formula
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## SPSS - If one of the colleges has significant impact?

Fixed-Price - Intermediate (\$\$) - Est. Budget: \$20 - Posted
This is data in SPSS format. There is about 200 variables. This is a SPSS .sav data file. We need to find if one of the colleges (AG, coded as 4) will significantly impact retention (retainedfall2010, 1=retained, 0=not retained). Thus far I have: However, students from AG have lower retention rate than other faculties with only 71.4%. Assessing Chi-square test for independence (χ^2=6.035, significance = 0.536), retention rate is independent from college type at 95% confidence level. So question is: Can you tell if AG has significant affect on retention? What test to use? What are the values? How do you interpret the values? Thanks!
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## SPSS

Fixed-Price - Intermediate (\$\$) - Est. Budget: \$30 - Posted
I have an Excel sheet of data (please see attached). I also have SPSS. I need the questions in the Excel sheet answered. Need someone who has experience with student retention rates data, if possible. Might need graphs and a summary of data that can be exported from SPSS to Excel.
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## Statistical Model for Cumulative Risk

Fixed-Price - Intermediate (\$\$) - Est. Budget: \$150 - Posted
Looking for an experienced statistician who can help us create a model for cumulative risk. We have several studies from scientific literature that report risk of adverse effects for patients using different therapies. We want to create a statistical model for describing the cumulative risk of patients using multiple therapies when the adverse effects are the same. All data is provided.
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## Write Articles on Biotech Trends

Fixed-Price - Intermediate (\$\$) - Est. Budget: \$18 - Posted
Write 5 articles on trends in the biotech industry, no less than 350 words each. Propose 2-3 keywords for each article along with your suggested titles (must be approved before writing). Keyword density for the content is 2%. This means that your keywords will be used in roughly 2% of each article text. You should have previous writing experience and some academic knowledge of science and biotechnology topics. You will need to be able to refer to statistics in the writing (using text links, not footnotes). All articles must have perfect English grammar and pass Copyscape. Without this, no article will be accepted. Long-term work for well-researched writers.
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## Need help completing statistical analysis linked to a small clinical research project

Fixed-Price - Intermediate (\$\$) - Est. Budget: \$300 - Posted
I need someone to help me with the statistical analysis link to a clinical research project recently completed: 1) Objective 1: To compare the effects of various combinations of four slopes (S=4) and three velocities (V=3) during manual wheelchair prolusion on a treadmill on cardiorespiratory outcome measures among individuals with a spinal cord injury (N=17). a. All excel sheets represent a variable that is relevant for the study (except the randomization order). All variables are continuous variables except the RPE that is categorical/ordinal. b. The values that are in red in the excel sheets were estimated based on a regression equation computed with the data of the participants who completed all combinations. This should be verified before initiating further statistics. c. Comparisons for repeated measures need to be made using the slope and velocity factors and the statistical differences need to be clearly identified with the appropriate tests. d. Strength of the statistics / effect size estimator needs to be included whenever possible 2) Objective 2: To propose an equation estimating the variable VO2 pointe (ml kg min) that is presented on a specific excel sheet. a. A regression equation needs to be generated using the S and V variables. b. Strength of the equation need to be included. c. Possibly compute the future sample size needed to further test the equation generated if possible. The choice of parametric or non-parametric statistitcs needs to be discussed. All statistics performed need to be clearly defined in a paragraph that will be integrated into the manuscript. All results need to be clearly highlighted in a paragraph that will be integrated into the manuscript. Table(s) and/or Figure(s) summarizing the results and key statistics need(s) to be prepared for the submission of the manuscript. The use of a p-value of 0.05 is needed and should be corrected whenever multiple comparisons are being performed. SPSS format is preferred for the statistical analyses.
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