Only about 2 grams is needed, or a piece about half the size of a thumb.
As a rule of thumb, if the largest residual is less than 10 pixels, the quality of a photogrammetry modeling project is high; otherwise, re-modeling is needed.
Sample-size estimation was based on the rule of thumb that 50 100 patients are needed in order to obtain adequate power for a study on reproducibility [10].
The sample size was based on the rule of thumb that 10 cases are needed for each covariate that is introduced in a logistic regression model [ 22].
As a rule of thumb, at least 10 sequences are needed to detect selection at a signal site with reliability.
As a rule of thumb, at least 12 time points are needed before and after the intervention in order to detect seasonal variation within the data.
According to a frequently mentioned rule of thumb that states that 10 events are needed per candidate predictor, sample sizes of the development cohorts were sufficient (Concato et al, 1995) but the development cohort of Gerestein et al (2009) still can be defined as small.
The target sample size of 450 (225 patients each in groups A and B) was determined by the number of items in the questionnaire (15) and the accepted 'rule of thumb' that 15 responses per item are needed (Johnson et al, 2011).
Regarding the rule of thumb of 10 respondents per patient safety culture item, at least 430 completed questionnaires were needed [ 19].
