Independent statistical consultant

Stuck on the stats chapter of your thesis or manuscript?

I help graduate students and researchers pick the right test, run it correctly, and explain what the results actually mean, in R, SPSS, or Python. No jargon dump, just an analysis you can defend in front of your committee.

Every project starts with a free scope and quote before anything is charged.
R, SPSS, Python
Software I work in
Theses, dissertations & manuscripts
What I usually help with
Plain English write ups
How results come back to you
Why people reach out

Common reasons to bring in outside help

If any of this sounds familiar, a scoped project can take the pressure off.

Tight deadlines

Data analysis usually takes longer than expected, and it often lands right when everything else in your program is also due. Handing off the statistics chapter frees up your time for the writing and the defense.

Making sense of the output

Running a test is one thing, knowing what the p value, the confidence interval, or the model coefficients actually mean for your question is another. I explain the output in plain language you can use in your results section.

Wanting a second opinion

If you already ran something and just want someone to check it before you submit, that's usually a smaller project than starting from scratch, and it can catch a mistake before your committee does.

Messy or complicated data

Missing values, unbalanced groups, repeated measures, mixed data types. These are common, not a sign you did something wrong, and they usually just need the right approach.

Getting ready for submission or defense

Reviewers and committees ask pointed questions about methods. I can help you anticipate what they'll ask and have the answer ready.

Wanting a defensible analysis

It's not enough for a result to look right, it needs to hold up when someone asks why you chose that test. I pick methods that fit your design and can explain the reasoning behind each choice.

Limited access to statistical software or training

Not every program teaches R or provides an SPSS license. I can work in whichever tool you already have access to, or the one your data is already in.

Who this is for

Statistical consulting fits well for

Master's dissertations, PhD theses, and undergraduate capstone papers
Systematic reviews and meta-analyses
Quantitative, qualitative, and epidemiological research
Results sections for journal articles
Sample size calculation and analysis methodology
Medical, health, and life sciences residencies
What I can help with

Six ways to get unstuck

Each card links to the actual Fiverr gig, so you can check reviews, pricing, and delivery time before reaching out.

Most requested

Statistical analysis for research & thesis

Send me your research question and data, and I'll run the analysis in R, SPSS, or Python, then walk you through what it actually means for your chapter or paper.

Learn more about thesis analysis → View this gig
Field & ecological data

Ecology & biodiversity analysis

Diversity indices, community analysis, and the kind of ecological statistics that show up constantly in papers but rarely get taught well in class.

Explore ecology analysis → View this gig
Visual summary

Graphical abstract design

A clean, one image summary of your paper, built for journal submission or for sharing once it's published.

View this gig
Before you touch your data

Analysis plan & preregistration

A statistical analysis plan written before data collection, matched to your design, the kind reviewers and preregistration platforms actually want to see.

View this gig
Spreadsheets, automated

Excel data cleanup & automation

Scattered spreadsheets turned into structured, automated workflows: Power Query imports and VBA macros for reports or invoices, documented so you can maintain it yourself.

Explore Excel automation → View this gig
Before it goes to your advisor

Sample size & power calculations

The number reviewers ask about first. I'll calculate the sample size your design actually needs, with the justification written out.

Explore sample size analysis → View this gig
What I can run

Not just the basics

Health, biology and ecology, social sciences, business, whatever field you're in, here's a closer look at the methods I work with most. If yours isn't listed, ask, there's a good chance I've run it before.

Comparing groups

Testing whether groups actually differ, and by how much.

Regression & modeling

Quantifying how variables relate to your outcome.

Mixed & longitudinal models

For repeated measures and data with natural groupings.

Study design & sampling

Getting the design right before you collect a single data point.

Survival analysis

Time-to-event data, from clinical follow-up to equipment failure.

Cox regression Hazard functions

Multivariate & psychometrics

Making sense of many variables, or validating a questionnaire.

Likert scale validation

Diagnostic test evaluation

How good is a test, screening tool, or classifier, really.

Sensitivity & specificity Predictive values

Meta-analysis & systematic review

Combining results across studies into one estimate.

Effect size pooling Heterogeneity (I²)

Time series

Data collected over time, and what it's trending toward.

Trend & seasonality Forecasting
How it works

Nothing complicated

A short, scoped process. No long term commitment required.

1

Tell me what you're working with

Send your research question, your data, and anything your advisor or a reviewer has already asked for.

2

Get a quote before anything starts

You'll know the price and turnaround up front, before I touch your data.

3

Get your analysis, explained

You'll receive the output plus a written explanation you can use directly in your methods and results sections.

Who you are working with

Every analysis is run by a researcher, not a template

Arlene Santisteban Campos

Founder and lead analyst, Statriva Data Analytics

Agronomic Engineer (UFC) · PhD in Soil Science (UFC) · MSc in Agricultural Engineering (UFC) · Former CNPq fellow (CENA/USP)

Agronomic engineer from the Federal University of Ceará (UFC, 2014, Magna Cum Laude), with an MSc in Agricultural Engineering (UFC, 2017) and a PhD in Soil Science (UFC, 2023), working in irrigation, soil fertility and soil biology. Three years in Industrial Technological Development at the Center for Nuclear Energy in Agriculture (CENA/USP), and more than eight years conducting research at Embrapa, including plant biochemistry, tissue culture and genetic resources laboratories. More than a decade of hands-on research, from the bench to publication, is what sits behind every analysis Statriva delivers.

Statriva Data Analytics is a registered Brazilian company (CNPJ 68.425.798/0001-57), serving clients worldwide in English, Portuguese and Spanish.

A bit about how I work

I'm not a big agency, and that's kind of the point

Most of the people I work with are in the middle of a thesis, a dissertation, or a manuscript revision, and just need someone who actually understands academic research.

Academic focus

I work with student and researcher data specifically

Not corporate dashboards. I know what an advisor or a reviewer is actually going to ask about your methods.

Your software

R, SPSS, or Python, your choice

Whatever your department already uses is what you'll get your results in.

Honest pricing

You get a quote before I start

Based on the actual scope of your project, not an hourly rate that grows the longer it takes.

Confidential

Your data and results stay yours

Nothing from your project gets reused, shared, or referenced elsewhere.

Direct

One person, start to finish

Every project is handled by me directly, nothing gets passed off to a subcontractor or a larger team. Every table, chart, and result is checked line by line and explained to you before it's delivered.

Data handling

Your data is treated the way research data should be

Most of the datasets that reach us are unpublished, and some involve human or clinical subjects. These are the rules we follow on every project, without being asked.

Confidential by default

Your dataset, your research question and your results are never reused, shared, published or referenced in any other project. A signed NDA is available on request, at no extra cost, before you send anything.

Only the data the analysis needs

We ask you to remove or code direct identifiers (names, ID numbers, addresses) before sending. If your study requires identifiers to stay in the file, we agree on that in writing first.

Storage, retention and deletion

Files are kept in access-controlled storage only while the project and its support window are open, and are permanently deleted on request at any time, or 12 months after delivery by default. Your data is never used to train AI models.

Reproducible and traceable

Every analysis is delivered with the commented script or syntax file that generated it, so any result can be re-run, audited and defended, by you or by a reviewer.

Read the full privacy and data handling policy →

Questions people ask before writing in

FAQ

What software do you use?

Whatever you and your department already work in, R, SPSS, or Python. If you're not sure, tell me what your data is in and we'll go from there.

Is it okay to get statistical help for my thesis or dissertation?

Yes. Getting help with data analysis is a normal part of research, the same way people work with a writing center or a methodologist on their committee. I run the analysis and explain it, but you're still the one who understands your study, defends it, and writes the discussion. I don't write dissertations or submit work on a client's behalf, and that's stated plainly in the footer of this site.

How long does a project usually take?

Depends on scope, but most thesis level analyses come back within a few days to a week once I have your data and a clear question. You'll get a specific timeline with your quote.

Will you write the methods and results sections for me?

I'll give you a written explanation of what was done and what it means, in language you can adapt directly into your methods and results sections. I won't write your discussion or interpret your findings within your field's literature, that part is yours.

Is my data kept private?

Yes. Nothing from your project gets reused, shared, or referenced in any other project.

What if I don't understand statistics at all?

That's fine, most people I work with aren't statisticians. I explain what a test does and why it fits your question, not just the raw output.

My advisor or a reviewer already gave feedback on my analysis. Can you help with that?

Yes, that's actually one of the most common reasons people reach out. Send the feedback along with your data and I'll address it directly.

Can you help with sample size or power calculations?

Yes. I calculate the sample size your design actually needs and write out the justification, the kind reviewers and ethics committees expect to see before data collection starts.

Can you run PERMANOVA, NMDS, or other ecological statistics in R?

Yes. Ordination, diversity indices, and community-level tests like PERMANOVA are a regular part of the ecology and biodiversity work I do, always with the assumptions checked and the output explained in plain language.

Can you automate my Excel spreadsheets with Power Query or VBA?

Yes. I build Power Query pipelines to import and structure raw data automatically, and VBA macros for repetitive tasks like report or invoice generation, with commented code so you can maintain it yourself afterward.

Do you check work I've already done, or only start from scratch?

Both. If you've already run something and just want a second set of eyes, that's usually a smaller, cheaper project than starting from zero.

Got a stats question that's been sitting in your inbox for two weeks?

Send it over. Most projects get a quote back within a day.

Prefer to reach out directly? statriva@gmail.com

See my Fiverr gigs
Talk to us

Send your research question and your dataset

Tell us what you have, what you need and when you need it. You get a fixed quote and a delivery date before any work begins, and before you are charged anything.