Based on a Regression Analysis with the percentage of ECD and CWD children at the school as control variables, the expected score describes the predicted average percentage of students deemed proficient on the Reading Language Arts section of the standardized test for the 2018-19 school year.
The actual score is based on the reported scores for this school as reported by the US Dept of Education. Below you can see how this score was reported in its raw form. Sometimes a range is reported, in which case we take the average of the range. For the most part, if there is a range, the delta is 4 points, so by taking the average we are at most 2 points off the actual score for the school.