Explanation of Masking Rules
The 2007 accountability data tables employ masking of assessment data, in order to comply with the federal Family Educational Rights and Privacy Act (FERPA). Generally speaking, the term "masking" refers to the use of special symbols to conceal the performance results. TAKS and SDAA II results are masked under the following conditions:
 When very few students in the group are assessed.
If performance is revealed for a group of very few students, then it is possible that the result for an individual student could be known, which violates that student's right to privacy.
 When all students have the same result (for example, either
all passing or all failing).
Revealing that 100 percent of the students passed or 0 percent passed has been deemed to violate the privacy of all students tested in that the result for every student tested is known. In cases where TAKS and SDAA II results are 100 percent or round to 100 percent, then the expression >99% is shown. In cases where TAKS and SDAA II results are 0 percent or round to 0 percent, then <1% is shown.
The tables below show each of the masking situations that are possible on the 2007 accountability data tables. Note that an asterisk ('*') is used for a number of different conditions. The symbols in the shaded bars will appear on the reports in place of the data shown in the examples.
TAKS and SDAA II Symbols Used
Scenarios  Numerator 
Denominator 
Percent 
Meaning 
Case 1  * 
* 
* 

Examples  4 
4 
100% 

3 
4 
75% 

0 
0 
n/a 

0 
4 
0% 

Case 2  * 
* 
>99% 

Examples  24 
24 
100% 

995 
1000 
100% 

199 
200 
100% 

Case 3  * 
* 
<1% 

Example  0 
5 
0% 

Case 4  * 
* 
Number 

Examples  22 
23 
96% 

198 
200 
99% 

3 
5 
60% 

Case 5  * 
* 
Number 

Examples  2 
5 
40% 

1 
5 
20% 
For there to be no masking of assessment data, all of the following conditions must be met:
 Denominator is five or more (ten or more on the TAKS Progress Indicator under AEA Procedures); and,
 Number passing is more than two; and,
 Number failing is more than two; and,
 Percent is not 100 or 0 and does not round to either 100 or 0.
Numerator  Denominator  Percent  
Examples  197 
200 
99% 
3 
6 
50% 

59 
62 
95% 
Dropout and Completion Symbols Used
Scenarios  Numerator  Denominator  Percent  Meaning 
Case 1  * 
Number 
* 
Denominator is 2, 3, or 4. 
Examples  1 
4 
25.0% 

0 
2 
0.0% 

3 
3 
100.0% 

Case 2  0 
0 
 
Denominator is 0. 
Case 3  * 
* 
* 
Denominator is 1. 
Examples  0 
1 
0.0% 

1 
1 
100.0% 
Symbols Used for Masking Downloads
Data available for download are also masked:
Masking Symbol in Download  Masking Symbol on Data Table  What is Masked 
1 
* 
Small numbers 
3 
<1% 
Values at or near 0% 
4 
>99% 
Values at or near 100% 
999 
* 
Small numbers in Actual Change and Required Improvement only. 