Renzulli Local Norms Report

Overview

To use local norms with the Renzulli Scales, you first need to establish the mean and standard deviation for a representative sample of the local population (the “Norming Sample”). Then, you can then use this mean and standard deviation to calculate standard scores and percentile ranks for students being considered for the gifted program (the “Active Sample”).

Selecting and Entering Students

Ideally, you would test your entire student population to establish local norms; however, this is generally not practical. When it is not possible to test all students in your local population, you need to test a representative sample of that population in order to establish the necessary mean and standard deviation.

Selecting a Representative Population


When selecting students for the representative sample, the goal is to ensure that the students in the sample are representative of the local student population. For most situations, a sample of 100–500 students would likely be sufficient. However, there is no “rule of thumb” for determining the sample size. If your total student population is large or diverse, you would want a larger representative sample size.

Students can be assigned to the representative sample on a random basis. One approach is to take a list of all students in a grade to be tested and select every Nth student (e.g., every 5th or 10th student) from the list to become part of the local norms.

You want students at all schools being tested to be included in a proportional manner. For example, if you have 120 fifth grade students at School A and 60 fifth graders at School B, you would want to use the Nth selection method to choose 24 students from School A’s fifth grade and 12 from School B’s fifth grade.

Entering or Importing Student Records


Important: make decisions about student assignments to the Norming Sample and Active Sample before entering student records. It is much easier to make the assignments as you enter student data, rather then going back and doing it later.

When using the online Renzulli Scales, your representative sample is referred to as the Norming Sample. The students being considered for the gifted program (for example, students nominated for the gifted program) are called the Active Sample. Note that it is possible for a student to be a member of both the Norming Sample and the Active Sample.

If you are entering student data manually, you can assign students to the Norming or Active Sample (or both) by clicking the appropriate checkbox at the bottom of the “Add New Student” screen.

Manual Entry

If you are importing student data, follow the steps for “Student Data Import” outlined in the School Administrator Manual. For the data import, please note that you assign students to the Norming or Active Sample (or both) by indicating a “Y” in the appropriate import fields.

  • first name,
  • last name,
  • gender (male/female),
  • date of birth (mm/dd/yyyy),
  • grade,
  • student ID#—optional,
  • info—optional,
  • active sample (Y or blank)—optional, and
  • norming sample (Y or blank)—optional.

Remember, when making use of optional fields, all optional fields should be included in your import .csv file even when the contents are blank. In other words, your spreadsheet should have eight columns, even though some optional fields will be left blank.

To Generate Standard Scores

Find the Mean and Standard Deviation of the Norming Sample


First, you need to find the mean and standard deviation for your entire local population or representative sample (Norming Sample).

In the Local Norms Report module, choose the second radio button, “Calculate standard scores and percentiles for a representative sample of the student population (Norming Sample).”

Radio Buttons

Then choose the appropriate filters and generate your report.

Filters

The data we need from this report is the mean and standard deviation that appears in the top left corner of the resulting report (.csv format).

Find the Mean and Standard Deviation of the Active Sample


Now, return to the Local Norms Report module and click the first radio button, “Calculate standard scores and percentiles for the Active Sample based on a previously established mean and standard deviation.” Next, enter the mean and standard deviation of your Norming Sample (see instructions above).

Next, choose the same grade, scale, and age filters as those you selected for the Norming Sample report.

The resulting report (.csv format) will show each student’s raw score, Z-score, and percentile rank when compared to the local population or representative sample of the local polulation.