Cover of The Sample-Size Justification Kit
Companion to The Statistical Test Selection Workbook

The Sample-Size Justification Kit

Once you know which test you will run, the next question is how many participants it needs. This kit produces that number and the written case for it.

The workbook helps you choose the test. The kit sizes the study for the test you chose. About the workbook.

$12

Paid through Stripe. Files arrive at once: printable worksheets in two paper sizes plus a spreadsheet.

Inside the kit

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Decide whether you need an a priori, sensitivity or compromise analysis

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Find the inputs your particular test requires, from t-tests to clustered designs

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Choose alpha, power and tails, including when several hypotheses are tested

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Source an effect-size estimate and check it against optimistic and cautious values

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Log every software setting so the calculation can be repeated

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Grow the result into a recruitment target and test whether it is achievable

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Draft the justification paragraph, with a page for qualitative strands too

The spreadsheet

Effect-size conversions, inflation to a recruitment target, a settings log, a feasibility check and a reporting checklist.

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Buying and delivery

The download link appears once payment clears and is emailed to you as well. Links last two weeks and allow ten downloads. Receipts come from GradSummit, the author's publishing imprint, which fulfils the kits. If the files will not download or open, email within two weeks for a refund. One licence per person.

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