Nomograms provide patients and clinicians with a scoring system for predicting events. http://www.scalelive.com/nomograms.html  #statistics #research

Seek out the highest quality evidence you can find in applied research. http://www.scalelive.com/acquiring-clinical-evidence.html #research #evidence 

Create a valid survey in eight steps. http://www.scalelive.com/surveys.html #survey #research #psychometrics 

Calculate the needed sample size when comparing two groups on a continuous outcome. http://www.scalelive.com/sample-size-for-independent-samples-t-test.html #statistics 

Spearman's rho is the correlation test used with two ordinal variables. http://www.scalelive.com/spearmans-rho.html #statistics #correlations #spss 

The rank biserial correlation is used when correlating categorical and ordinal variables. http://www.scalelive.com/rank-biserial.html #statistics #correlation

Known-groups validity measures how well a survey differentiates between existing groups. www.scalelive.com/known-groups-validity.html #psychometrics

A pilot study is conducted when no measure of effect size exists to plan for sample size calculations. http://www.scalelive.com/pilot-study.html #research 

Multicollinearity occurs in regression when two predictor variables are highly correlated. https://t.co/Qo54muPY0E ‪#‎multicollinearity‬

Non-parametric statistics are used with categorical and ordinal outcomes. Non-parametric statistics are also used when the statistical assumptions of parametric statistics are violated (normality and homogeneity of variance). http://www.scalelive.com/non-parametric-statistics.html