Statistical FAQs

How are the confidence limits calculated for the linearity study?

Lower CI[i] = ab - tPart
Upper CI[i] = ab + tPart

Where

• ab = average bias
• tPart = tCrit*sqrt((1/dfT) + ( (nLevels[i]-xMean)**2) / sumXSquared) * s )
• nLevels[i] = number of levels for the Standard variable
• xMean = the sum of the number of levels for the standard divided by the number of levels for the factor
• dfT = degrees of freedom for the term(s) or model

FAQ # 2080
Last Updated: 2004 Apr 28

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