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Table 1 Parameters estimates of the linear regression model explaining the ratio provided by the Raschpower method

From: A simple ratio-based approach for power and sample size determination for 2-group comparison using Rasch models

Variables

NPOP = 984722

P-values

Intercept

1.012 (7.0 10−5)

<10−3

1/σ2

0.095 (1.0 10−4)

<10−3

1/J

0.939 (5.0 10−4)

<10−3

Interaction (1/σ2*1/J)

3.730 (7.5 10−4)

<10−3

R2

0.994

/

RMSE

0.030

/

  1. Standard errors in parentheses. σ2: variance of the latent trait; J: number of items.
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BMC Medical Research Methodology

ISSN: 1471-2288

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