The Growth and Achievement Fan Graph

If none of the students have taken a Star Reading assessment in the timeframe that you have selected, the Reading Overview will not have a fan graph; instead, it will show you a message explaining that there is insufficient data.

If students have taken a Star Reading assessment, the fan graph shows you the Reading Age for the student(s), when tests were taken, where the scores fall in the benchmark categories and the growth for the student(s) in the selected time period (using Student Growth Percentile).


The benchmarks used are shown in the drop-down list in the top right corner of the graph; you can use the drop-down list to select other available benchmarks.

fan graph

The benchmark categories that the scores fall within are shown by the grey shading in the graph. The related Reading Ages are shown on the left side of the graph.

fan graph

Test Scores on the Graph

The large circle with a score (8:06 in the example above) shows the student's first test of this school year (typically an autumn test); if you have chosen a group or class, this is the students' median score for the first test. This is the starting point for student growth for the year. The small blue circles show other tests taken within this school year (or medians for test windows for a class or group). The diamond represents the student's Student Growth Percentile (or the median SGP for the group or class).

After the first score of this school year, you will see a green, yellow and red "fan" like the one shown above. (If some of the fan is white, it is because you have selected "Marking Period", so only the portion of the fan that is in this marking period is showing the colours.) The colours on the graph represent the students' growth:

  • green The green portion shows high growth for this student or group (66th to 95th Student Growth Percentile).
  • green The yellow portion shows typical growth (35th to 65th).
  • green The red portion shows low growth (5th to 34th).

The student scores typically fall within these categories, showing you the rate of growth as measured by the scores. To increase the likelihood that a student will show high or typical growth, consider additional instruction or improvements in instructional strategies to meet the student's needs.

If the colour categories are different sizes, it is because there is a difference in the range of Scaled Scores associated with the SGP for each range. If the red category is larger than the yellow or green categories, it does not mean there is a greater likelihood that the student(s) will experience low growth versus moderate or high growth. It also does not mean that the student(s) will have a decrease in Scaled Score. The difference means that there are more Scaled Scores associated with SGPs in that range.

Projected and Predicted Growth

Also on the graph, you will see dashed lines showing the Projected score based on a 50th Student Growth Percentile and the Predicted score based on the student's latest Star Reading test and current trajectory.

Projected Score: Projected scores show the Reading Age the student would attain if the student experienced typical growth (SGP of 50). The calculation is based on the first autumn Star Reading test of the school year and a prior score in a testing window (such as the previous summer score) to establish a new summer Reading Age projection based on an SGP of 50. This score does not change as the school year goes on. This score is not shown for students who have not taken a Star Reading test in the past 18 months.

Predicted Score: Like the Projected Score, this is based on typical growth (SGP of 50). This calculation is based on the most recent Star Reading test and a prior score in a testing window (such as the previous summer score). The Predicted score is adjusted based on the latest Star test score and an assumption of typical growth (SGP of 50). This score is not shown for students who have not taken a Star Reading test in the past 18 months.

Viewing All Time Data

If you have chosen to see All Time data, you will see a graph like the one below. The white circles show the summer Star Reading test in each school year. The arrows between those scores show the growth from year to year; the colour indicates whether growth is high (green), typical (yellow) or low (red). The number in the diamond shows the Student Growth Percentile for the growth from one year to the next.

All Time Graph


Above the graph, you can select the Reading Age median comparisons that you want to add to the graph:

  • group median (available if you have selected a group, then chosen to view data for a single student within that group)
  • class median (available if you have chosen to view data for a group within a class or for one student)
  • school median
  • school network median
  • national median

When you view data for an entire class, you can choose school, school network and nation comparisons.

When you select a comparison, you will see the symbol for that comparison on the graph, with a line showing the median scores and growth.

Below the comparisons that you can select, you will see the difference between the student's Student Growth Percentile and the group, class, school, school network and national median. In the example below, the green +6 below the school median means the student's SGP is 6 points above the median for the school, while the red -4 below the class median means the student's SGP is 4 points below the median for his or her class and represents low growth.

The student's current Student Growth Percentile is always used no matter what timeframe you choose to view, so if you are viewing All Time data, note that the Student Growth Percentiles are not based on that timeframe.