AMSTAT Consulting’s Expertise
AMSTAT Consulting has become nationally recognized for providing its statistical consulting services to numerous professors and researchers. Our successful clients cite these reasons for choosing to work with AMSTAT Consulting.
All of our principals have PhDs at leading universities, including Harvard, Stanford, and Columbia. They include nationally renowned scholars. They have extensive backgrounds in statistics and biostatistics and over 100 years of practical experience in quantitative and qualitative methods. They are experts in statistical programming languages such as SPSS, SAS, Stata, R, HLM, Mplus, SPSS Amos, SPSS Modeler, Azure, JMP, WinBUGS, Minitab, Match!3, and Access. They are experts in using qualitative data analysis software such as NVivo, Nud*ist, HyperResearch, and Atlas. They are experts in statistical analysis (e.g., linear regression, logistic regression, hierarchical regression analysis, correlation analysis, chi-square test, t-test, ANOVA, MANOVA, structural equation modeling (SEM), multilevel SEM, confirmatory factor analysis (CFA), multilevel CFA, factor analysis, principal components analysis, time series analysis, Cox regression, Kaplan-Meier survival analysis, hierarchical linear modeling (HLM), meta-analysis, Bayesian analysis, latent class analysis, longitudinal growth modeling, mixture model, linear mixed models, distribution analysis, ensemble analysis, de-identification, trend analysis, sensitivity analysis, negative binomial regression, interim analysis, decision tree, item analysis, nonparametric test, statistical and decision modeling, maxDiff, segmentation and cluster analysis, conjoint/discrete choice, predictive analytics, and advanced statistical analysis).
Our fees usually pale in comparison to the savings and additional profits that our work produces for our clients. Over 90% of our clients request our assistance more than once, as our clients are almost universally happy with our different brands of consulting. We are more reasonably priced than most other consultants. We offer personalized, comprehensive, and friendly support during and after your consultation with us. We offer ultra-fast turnaround times, often completing sections within 4-5 business days. We are members in good standing of the Statistical Consulting section of the American Statistical Association.
Quantitative Research
We are happy to provide the help you need at any or all of the following steps in earning the data-based answers you request:
- Establishing and operationalizing your hypotheses and research questions
- Providing ample instruction on the methods used
- Inputting, organizing, and cleaning the data
- Implementing the statistical analyses
- Testing reliability (such as Cronbach’s alpha, test-retest reliability, split-half reliability, and inter-rater reliability) and validity (such as content validity, construct validity, criterion validity, internal validity, and external validity)
- Writing up all results, including APA tables and figures
- Providing syntax and raw output file
- Explaining the results
- Allowing unlimited e-mail and phone support to ensure that you completely understand the results of the analysis
- Conducting two rounds of incidental statistics (i.e., if you would like additional statistics)
- Preparing an effective PowerPoint Presentation.
Data Management and Test Results for Reliability and Validity
AMSTAT Consulting is dedicated to detecting and correcting corrupt or inaccurate records from a recordset, table, or database. The process of data cleaning includes data auditing, workflow specification, workflow execution, post-processing, and controlling. We can use popular methods. Those include parsing, data transformation, duplicate elimination, and statistical methods.
By analyzing the data using the values of mean, standard deviation, range, and clustering algorithms, we can find values that are unexpected and thus erroneous. We can examine any standardized residual greater than about 3 in absolute value, Hat element greater than 3p/n (p=k+1, k degrees of freedom), a Cook’s distance > 1, and Mahalanobis’s distance. We run Outlier Analysis such as a run-sequence plot, a scatter plot, a histogram, and a box plot.
We can test reliability (such as Cronbach’s alpha, test-retest reliability, split-half reliability, and inter-rater reliability) and validity (such as content validity, construct validity, criterion validity, internal validity, and external validity).
Statistical Analysis
We can design and perform the required statistical analyses. Here is a sample of some of the analytical tools with which we are familiar:
- Correlation Analysis, T-test, Chi-square Test, Regression Analysis, Logistic Regression, Hierarchical Regression Analysis, Factor Analysis, Principal Components Analysis, One-way ANOVA/ANCOVA, One-way MANOVA/MANCOVA, Factorial ANOVA/ANCOVA, Repeated Measures ANOVA/ANCOVA, Repeated Measures MANOVA/MANCOVA, Nonparametric Test (Wilcoxon signed rank test, Friedman test, Kruskal-Wallis test, Mann-Whitney test, Spearman Rank Correlation), Structural Equation Modeling (SEM), Multilevel SEM, Confirmatory Factor Analysis (CFA), Multilevel CFA, Exploratory Factor Analysis, Mediation Analysis, Moderation Analysis, Time Series Analysis, Spatial Time-series Modeling, Cox Regression, Kaplan-Meier Survival Analysis, Trend Analysis, Sensitivity Analysis, Hierarchical Linear Modeling (HLM), Bayesian Analysis, Bayesian Cox Regression, Joint Hierarchical Bayesian Modeling, Latent Class Analysis, Longitudinal Growth Modeling, Mixed-Effects Regression Model, Meta-Analysis, Mixture Model, Linear Mixed Models, Distribution Analysis (e.g., Lognormal, Weibull, Gamma), Decision Tree, Ensemble Analysis, De-identification, Interim Analysis, Item Analysis, Discriminant Analysis, Binomial Test, Heterogeneity Test, Multidimensional Scaling, Tau-U Analysis, Negative Binomial Regression, Statistical and Decision Modeling, MaxDiff, Segmentation and Cluster Analysis, Conjoint/Discrete Choice, Predictive Analytics, and Advanced Statistical Analysis
We have expertise in virtually every statistical and qualitative software package, including but not limited to:
- SPSS, SAS, Stata, HLM, Mplus, R, SPSS Amos, SPSS Modeler, Azure, JMP, WinBUGS, Minitab, Match!3, Access, NVivo, Nud*ist, HyperResearch, and Atlas.
Qualitative Research
We are happy to provide the help you need at any or all of the following steps in earning the data-based answers you request:
- Establishing and operationalizing your research questions
- Providing ample instruction on the methods used
- Coding, thematizing, and providing reporting of findings for a study
- Identifying themes and sub-themes
- Coding documents in order to count the word-phrase clusters
- Creating a word-phrase cluster in the form of classified conceptual categories for the purpose of counting those conceptually categorized words or phrases
- Addressing specific subthemes that the thematic constructs have
- Providing numerical frequencies and standard scores for each master theme and sub-theme
- Writing up all results, including APA tables and figures
- Explaining the results
- Allowing unlimited e-mail and phone support to ensure that you completely understand the results of the analysis
- Preparing an effective PowerPoint Presentation.ch master theme and sub-theme.
Qualitative Research Design
Phenomenology
Standardized as a phenomenological research methodology by Moustakas (1994), the modified van Kaam (1959) method involves understanding the essence, meaning, and structure of an individual’s lived experiences. AMSTAT Consulting uses this methodology to look for patterns and trends by identifying shared beliefs.
Case Study
A case study is a research methodology that has commonly used in social sciences. A case study is a research strategy and an empirical inquiry that investigates a phenomenon within its real-life context. Case studies are based on an in-depth investigation of a single individual, group, or event to explore the causes of underlying principles. A case study is a descriptive and exploratory analysis of a person, group, or event. A case study research can be single or multiple case studies, includes quantitative evidence, relies on multiple sources of evidence, and benefits from the prior development of theoretical propositions. Case studies are an analysis of persons, groups, events, decisions, periods, policies, institutions, or other systems that are studied holistically by one or more methods.
This list shows a sample of the past clients.
Impact Stories
Publish Journals
Helped professors and researchers publish numerous journals.
Contribution to knowledge
Presented statistical guidelines for professors and researchers.
4,000+ professors served
4,000+ professors served
3,000+ researchers served
3,000+ researchers served
Examples of our work
Banking Fees & Financial Performance
We measured the impact of banking fees on financial performance. The hypothesis was as follows: H1: Banking fees significantly affect financial performance. We performed a regression analysis to examine the hypothesis. Banking fees significantly and positively affected [...]
Relative Risk of Lung Cancer
We compared the difference in relative risk (RR) of lung cancer between the intervention and control groups. The hypothesis was as follows: H1: The intervention group will have an increase in relative risk (RR) of [...]
Blood Pressure
We examined the difference in blood pressure between patients with cancer and patients without cancer. The hypothesis was as follows: H1. There is a significant difference in blood pressure between patients with cancer and [...]
Internet Use & Perceived Performance
We measured the impact of internet use on perceived performance in technology companies and age differences in internet usage. The hypotheses were as follows: H1: Internet use significantly affects perceived performance in technology companies. [...]
Discover our PhD-level experts’ secret tutorials
Secret Tutorial: Linear Regression Analysis
A simple linear regression assesses the linear relationship between two continuous variables to predict the value of a dependent variable based on the value of an independent variable. More specifically, it will let you: [...]
Secret Tutorial: Independent Samples T-Test
The independent-samples t-test is used to determine if a difference exists between the means of two independent groups on a continuous dependent variable. More specifically, it will let you determine whether the difference between [...]
Secret Tutorial: Binomial Logistic Regression
A binomial logistic regression attempts to predict the probability that an observation falls into one of two categories of a dichotomous dependent variable based on one or more independent variables that can be either [...]
Secret Tutorial: One-Way ANOVA
If you want to determine whether there are any statistically significant differences between the means of two or more independent groups, you can use a one-way analysis of variance (ANOVA). For example, you could [...]
