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phdguide

Knowledge Hub

A free, plain-English encyclopedia of research — concepts, statistical tests, terminology and tools, explained for scholars at every level. Every term links to deeper guides, tools and mentoring.

100 terms

C

Case Study

Qualitative research

An in-depth investigation of a bounded system — an organisation, programme or event — using multiple evidence sources to answer how and why questions in real context.

Chi-square Test

Statistics & analysis

A test of association between categorical variables (test of independence) or of an observed distribution against an expected one (goodness of fit).

Common Method Bias

Statistics & analysis

Spurious covariance introduced when predictor and outcome data come from the same source, method and moment — a standard reviewer concern in single-survey studies.

Composite Reliability

Statistics & analysis

A reliability measure for latent constructs (also called rho_c) that weights items by their loadings; 0.70 or higher is the usual threshold in SEM.

Conceptual Framework

Methodology & design

A diagram or narrative showing the variables in a study and the hypothesised relationships between them, derived from theory and literature.

Confidence Interval

Statistics & analysis

A range around a sample estimate within which the true population value plausibly lies — a 95% CI conveys both the estimate and its precision.

Confirmatory Factor Analysis (CFA)

Statistics & analysis

A technique that tests whether measured items load onto the latent constructs a theory predicts, assessing construct validity.

Conflict of Interest

Ethics & integrity

Any financial, professional or personal interest that could bias — or appear to bias — a researcher's judgement; managed by disclosure, not concealment.

Construct Validity

Methodology & design

The extent to which a measurement instrument actually captures the abstract concept it claims to measure.

Correlation

Statistics & analysis

A measure of how strongly two variables move together, from −1 to +1 — Pearson's r for continuous linear relationships, Spearman's rho for ordinal or non-normal data.

Coursework (PhD)

Writing & examination

The mandatory taught component at the start of a PhD — research methodology, ethics and discipline courses — that must be cleared before registration confirms.

Cronbach's Alpha

Statistics & analysis

A coefficient (0–1) estimating the internal-consistency reliability of a multi-item scale; values of 0.7 and above are commonly considered acceptable.

Cross-sectional Study

Methodology & design

A design that collects data at a single point in time, giving a snapshot rather than tracking change.

P

p-value

Statistics & analysis

The probability of obtaining results at least as extreme as observed if the null hypothesis were true; below a threshold (often 0.05) it is deemed statistically significant.

Paraphrasing

Writing & examination

Restating a source's idea entirely in your own words and structure, with citation — the core skill separating legitimate scholarship from patchwriting and plagiarism.

Peer Review

Publishing & metrics

Expert evaluation of a manuscript before publication — typically double-blind in management and social sciences — assessing rigour, novelty and contribution.

Phenomenology

Qualitative research

A qualitative approach studying the lived experience of a phenomenon — what it is like, and what its essential structure is — through deep interviews with those who have lived it.

Pilot Study

Methodology & design

A small-scale trial run of instruments and procedures before main data collection — testing clarity, timing, reliability and feasibility while changes are still cheap.

Plagiarism

Ethics & integrity

Presenting someone else's words, ideas or work as your own without attribution — including recycling your own published text (self-plagiarism) without disclosure.

PLS-SEM

Statistics & analysis

Partial Least Squares Structural Equation Modelling: a variance-based SEM approach (run in SmartPLS) suited to prediction, complex models and smaller samples.

Population

Methodology & design

The entire group about which a study seeks to draw conclusions; the sample is drawn from it.

Predatory Journal

Publishing & metrics

A publication that charges fees while faking or skipping peer review — recognisable by solicitation emails, days-long 'review', unverifiable metrics and false indexing claims.

PRISMA

Publishing & metrics

Preferred Reporting Items for Systematic Reviews and Meta-Analyses: a checklist and flow diagram for transparent, reproducible review reporting.

Purposive Sampling

Methodology & design

Non-probability sampling that deliberately selects information-rich cases against explicit criteria — the default sampling logic of qualitative research.

S

Sample Size

Methodology & design

The number of observations in a study; adequate size is needed for statistical power and credible estimates.

Sampling

Methodology & design

The method of selecting units from a population — probability methods (e.g. random) support generalisation; non-probability methods (e.g. convenience) do not.

Scopus

Publishing & metrics

A large abstract-and-citation database of peer-reviewed literature, widely used to assess journal indexing and research impact.

Shodhganga

Writing & examination

INFLIBNET's national repository of Indian theses and dissertations — where accepted PhD theses are deposited and publicly accessible.

SmartPLS

Software & tools

Software for PLS-SEM, used to estimate measurement and structural models, run bootstrapping and assess predictive relevance.

Snowball Sampling

Methodology & design

Non-probability sampling in which existing participants refer further participants — the standard route into hard-to-reach or networked populations.

SPSS

Software & tools

IBM Statistical Package for the Social Sciences: widely used software for descriptive and inferential statistics such as t-tests, ANOVA and regression.

Statistical Power

Statistics & analysis

The probability (conventionally targeted at 0.80) that a test detects an effect that genuinely exists — driven by sample size, effect size and significance level.

Stratified Sampling

Methodology & design

Probability sampling that divides the population into strata (e.g. grade, sector, region) and samples randomly within each — guaranteeing subgroup representation and usually improving precision.

Structural Equation Modelling (SEM)

Statistics & analysis

A framework that simultaneously tests measurement (items to constructs) and structural (construct to construct) relationships.

Synopsis

Writing & examination

The concise research plan document most Indian universities require for PhD registration — problem, gap, questions, methodology and timeline in a prescribed format.

Systematic Literature Review (SLR)

Publishing & metrics

A review using an explicit, reproducible protocol to search, screen, appraise and synthesise all relevant studies on a question.

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