Statistical Analysis Training Online

Objective measurement involves the measurement of physical quantities and qualities using measurement equipments and Subjective measurement involves ratings or judgments by humans of quantities or qualities.

Compare reliability vs. validity.

While reliability is the property of reproducibility of the results of a measurement procedure or tool; Validity is concerned with accuracy of the procedure.

List the common data entry errors.

• Wrong data but within the range
• Wrong data and out of range
• False logic
• Missing data

Outliers are observations that deviate substantially from the majority of observations. Outliers can lead to

• Model misspecification
• Incorrect analysis results
• Biased parameter estimation

It is the standard deviation of the distribution of sample means

Standard error decreases with increase in the sample size.

SAS and SPSS