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Biostats PhD - Expert in Calculus, Linear Algebra, Stats, R and STATA
David A.

4.9 (38 ratings)

129 hours tutoring

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Hourly Rate: $95
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Response time: 13 hours

About David

Bio

✅ PhD - Biostatistics
✅ MS - Statistics
✅ BS - Mathematics
✅ Secondary Education - Teaching Credential in Math

My expertise goes far beyond intro math and statistics. I have been tutoring throughout my entire academic career and it is my greatest passion! I have taught at the High School level and College level. At the High School level, I have mastered proven strategies that helped student earn advanced scores on the SAT & ACT Math, Pre-Algebra, Algebra I & II, Geometry, Trigonometry,...

✅ PhD - Biostatistics
✅ MS - Statistics
✅ BS - Mathematics
✅ Secondary Education - Teaching Credential in Math

My expertise goes far beyond intro math and statistics. I have been tutoring throughout my entire academic career and it is my greatest passion! I have taught at the High School level and College level. At the High School level, I have mastered proven strategies that helped student earn advanced scores on the SAT & ACT Math, Pre-Algebra, Algebra I & II, Geometry, Trigonometry, and Pre-Calculus class. I also helped students earn 5’s on the AP Calculus Exam.

With deep training in advanced mathematics and statistics, I provide expert tutoring in College level Calculus I & II, Linear Algebra, and multiple levels of Statistics and Biostatistics—from Linear Regression and GLMs to Generalized Linear Mixed Models.

In addition, my PhD research and professional industry experience allow me to bring real-world examples to every tutoring session in Data Analysis, Data Science, and programming using Python, R, MATLAB, and STATA. My goal in every session is simple: clear explanations, faster progress, and lasting confidence.

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Education

California State University, Northridge
Mathematics
The Ohio State University
PhD
The Ohio State University
Masters
  • Licensed teacher

Additional Languages

Spanish

Policies

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Approved Subjects

Biostatistics

Biostatistics

I hold a PhD in Biostatistics with extensive experience in both theoretical foundations and applied statistical modeling. I have worked with real-world biomedical and public health data, using advanced methods such as linear regression, generalized linear models, and generalized linear mixed models. My teaching emphasizes clear interpretation of results, correct model selection, and understanding assumptions—not just computation. I help students build strong intuition and confidence when applying biostatistical methods in coursework, research, and professional settings.
Calculus

Calculus

I have extensive experience teaching and tutoring Calculus at both the high school and college levels, including Calculus I and II. My background in advanced mathematics allows me to explain limits, derivatives, integrals, and applications with clarity and precision. I focus on building strong conceptual understanding while also improving problem-solving speed and accuracy. Many of my students see significant gains in both course performance and exam confidence.
CBEST

CBEST

I have personally passed the CBEST with a high score on the first try and understand the structure and expectations of the exam. I help candidates strengthen core math skills while focusing on the specific question types and pacing strategies used on the CBEST. My approach emphasizes efficiency, accuracy, and confidence on test day. Students work through targeted practice designed to maximize their score in a limited time.
Data Analysis

Data Analysis

I have PhD-level training and professional experience in data analysis across academic and real-world settings. I help students learn how to clean data, select appropriate statistical methods, and interpret results with clarity and accuracy. My instruction emphasizes practical workflows, critical thinking, and avoiding common analytical errors. Students gain skills they can immediately apply to coursework, research, and professional projects.
Data Science

Data Science

I bring PhD-level training and professional experience to data science tutoring, with a strong emphasis on real-world data analysis. I help students understand how to clean data, choose appropriate models, and interpret results correctly rather than relying on black-box methods. My sessions integrate statistical reasoning with practical programming in Python and R. Students gain skills that transfer directly to coursework, research, and industry applications.
Data Structures

Data Structures

I tutor data structures with a focus on understanding how and why core structures are used rather than memorizing implementations. Students learn key concepts such as arrays, lists, stacks, queues, trees, and hash-based structures through clear examples and problem-solving. I emphasize efficiency, logical thinking, and connecting data structures to real programming tasks. This approach helps students succeed in coursework while building skills that transfer to computer science and data-focused applications.
Discrete Math

Discrete Math

I tutor discrete mathematics from a rigorous mathematical perspective grounded in formal reasoning and proof-based thinking. My background in mathematics and advanced quantitative methods allows me to clearly explain logic, sets, functions, relations, and combinatorics. I focus on building intuition for abstract concepts while maintaining mathematical precision. This approach helps students succeed in proof-based coursework and strengthen their overall mathematical maturity.
Epidemiology

Epidemiology

I tutor epidemiology from a strong quantitative and statistical perspective grounded in my PhD training in biostatistics. I help students understand core epidemiologic concepts such as study design, bias, confounding, and interpretation of risk measures. My approach emphasizes connecting epidemiologic theory with statistical reasoning to correctly analyze and interpret data. This is especially valuable for students in public health, health sciences, and related quantitative programs.
Finite Math

Finite Math

I tutor finite mathematics with a strong focus on applied problem solving and quantitative reasoning. My background in mathematics and statistics allows me to clearly explain topics such as functions, matrices, linear models, probability, and basic optimization. I emphasize understanding the underlying concepts rather than memorizing procedures. This approach helps students succeed in coursework while building practical mathematical skills used in business, economics, and the social sciences.
Linear Algebra

Linear Algebra

I am an expert in linear algebra with advanced training through graduate and doctoral-level mathematics and statistics. I tutor both computational and theoretical aspects, including vector spaces, linear transformations, eigenvalues, and matrix decompositions. My instruction emphasizes deep conceptual understanding alongside efficient problem-solving techniques. Students gain clarity, confidence, and the ability to apply linear algebra across mathematics, statistics, and data-focused coursework.
Logic

Logic

I tutor mathematical logic with an emphasis on precise reasoning and clear argumentation grounded in formal mathematics. My background in advanced mathematics allows me to explain propositional and predicate logic, logical equivalence, and proof structure with clarity. I focus on helping students translate statements into symbolic form and reason correctly through complex arguments. This strengthens performance in proof-based courses and advanced quantitative subjects.
Macintosh

Macintosh

I have over 10 years of experience working extensively with Macintosh systems for academic, research, and programming-related tasks. I am highly proficient with macOS, including confident use of the Terminal and advanced system workflows. Over the years, I have used a wide range of professional applications and analytical software. I help students and professionals use their Mac efficiently, troubleshoot issues, and work productively in technical and academic settings.
MATLAB

MATLAB

I have over five years of experience using MATLAB for mathematical modeling, data analysis, and scientific computation. My background in mathematics and statistics allows me to teach both the theory behind the methods and their correct implementation in MATLAB. I help students work efficiently with matrices, numerical methods, and visualizations. Sessions focus on clarity, accuracy, and building confidence in applied problem solving.
Microsoft Outlook

Microsoft Outlook

I have used Microsoft Outlook for the past five years for all my graduate school work activities. This included emails, calendar invitations, and even joining various calendars together. This experience was allowed me to learn hands on how to properly use and manage Microsoft Outlook at a proficient level.
R

R

I have extensive experience using R for statistical analysis, data visualization, and reproducible research at the graduate and professional levels. My background in biostatistics allows me to teach not only how to write R code, but why specific methods and workflows are appropriate. I help students move from basic syntax to applied modeling, including regression and generalized linear models. Sessions emphasize clarity, efficiency, and correct interpretation of results.
Real Analysis

Real Analysis

I tutor real analysis with a strong emphasis on rigorous reasoning and proof-based understanding. My advanced training in mathematics allows me to clearly explain limits, continuity, differentiation, integration, and sequences and series from a theoretical perspective. I help students develop the precision and mathematical maturity required for upper-division and graduate-level coursework. Sessions focus on clarity, structure, and confidence in constructing and understanding proofs.
SAS

SAS

I have experience using SAS for statistical analysis within academic and applied settings. My strong background in statistics allows me to help students understand how SAS procedures connect to the underlying statistical concepts. I focus on reading, writing, and interpreting SAS output rather than memorizing syntax. This approach helps students use SAS effectively and confidently for coursework and applied projects.
Spanish

Spanish

I am fluent in Spanish and use the language regularly. I help students improve comprehension, conversation, and practical language use in a clear and supportive way. My approach emphasizes confidence and real-world communication, but also formal grammar instruction. This is ideal for students who need reinforcement or applied practice in Spanish.
STATA

STATA

I have over four years of experience using STATA for advanced statistical analysis in academic and applied research settings. My background in statistics and biostatistics allows me to teach both correct model implementation and proper interpretation of results. I regularly work with regression models, data management, and statistical inference in STATA. Students gain confidence using STATA efficiently and accurately for coursework, research, and applied projects.
Statistics

Statistics

I hold a PhD in Biostatistics and an MS in Statistics, with extensive experience teaching and tutoring statistics at multiple levels. I help students build strong intuition for probability, inference, and statistical reasoning rather than memorizing formulas. My approach emphasizes correct methodology, interpretation of results, and avoiding common mistakes. I support students in coursework, exams, and applied projects with clear, structured explanations.
ACT Math
Algebra 1
Algebra 2
Differential Equations
Elementary Math
GED
Geometry
Java
LSAT
Microsoft Excel
Prealgebra
Precalculus
Python
SAT Math
SQL
Trigonometry
David A.'s Photo

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Response time: 13 hours

Ratings and Reviews

Rating

4.9 (38 ratings)
5 star
(35)
4 star
(3)
3 star
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2 star
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Reviews

Awesome Tutor

David is an awesome tutor with lots of patience and knowledge. He cares for his students, and I like how he motivates my daughter to do her best. He is very responsible and on time. Thank you David. You are awesome.

Martha, 12 lessons with David

Awesome

I asked many tutors for a lesson but they all denied me because it was last minute. David was the only one that accepted & helped me and I really appreciate that. He is very patient and will go over anything you don't understand. We did only one lesson but I will definitely take him again ! :))

Deana, 1 lesson with David

The Best Tutor-Ever

David is the greatest tutor-ever! Unfortunately, I won't be able to continue with a tutor due to personal issues I am presently experiencing. I thank WyzAnt, David and all other prospective tutors who interviewed with me online. My grandson is still using your service. Thank you for our family moving ahead with the help of your wonderful agency.

Cynthia, 1 lesson with David

Outstanding tutor!

David A. is courteous, patient, and explains the material really well. I was surprised how easily accessible he is. I was able to schedule a session right away without any problems. David was very punctual, he arrived at our session ten minutes earlier than was expected. He was very organized and explained each problem very thoroughly. He made sure that I understood the concept. If I didn't understand a particular problem, he would repeat each step until I understood how to solve it. He would often ask me if I had any questions. He is very well informed and knowledgeable. I would highly recommend him.

E., 1 lesson with David

Fantastic!!!

David is very knowledgeable with my son's math material. He goes above and beyond! My son started with a 52% in his initial assessment and because of David's help he achieved a 97% in his most recent test!!! Thank you!!!!!

Christina, 40 lessons with David
Hourly Rate: $95
Response time: 13 hours
Contact David