Iowa Test of Basic Skills (ITBS)

Mathematics

Cost

Technology, Human Resources, and Accommodations for Special Needs

Service and Support

Purpose and Other Implementation Information

Usage and Reporting

Initial Cost:

No information provided; contact vendor for details.

 

Replacement Cost:

No information provided; contact vendor for details.

 

Included in Cost:

Test booklets are sold in packages of 25 booklets. Each package includes Directions for Administration. Students mark their answers using a separate answer document.

Technology Requirements:

  • Computer optional

 

Training Requirements:

  • Less than 1 hour of training

 

Qualified Administrators:

  • Professionals

 

Accommodations:

Braille and Large-Print editions are available for students with visual impairments. In addition to these special editions, the standardization of the Iowa Tests of Basic Skills also included students using a wide range of accommodations. Such accommodations included the following: extended time, individual/small group administrations, communication assistance, repeated directions, tests read aloud, answers recorded, transferred answers, and tested off level. Those same accommodations can be used when the tests are administered operationally.

Where to Obtain:

Website: www.riversidepublishing.com

Address: 3800 Golf Road, Suite 100, Rolling Meadows, IL, 60008             

Phone number: 800-323-9540


Access to Technical Support:

Users can access toll-free telephone support and consult Riverside Field Staff.

The Iowa Tests of Basic Skills measure the skills, academic growth, and achievement of students from Kindergarten through Grade 8. Developed at The University of Iowa, and backed by a tradition of more than 70 years of educational research and test development experience, the ITBS provides an in-depth assessment of students’ achievement of important educational objectives. Tests in reading, language arts, mathematics, social studies, science, and information sources yield comprehensive information both about the development of students’ skills and about their ability to think critically.

 

Form C reflects the most up-to-date thinking about curriculum as represented in current content standards, curriculum frameworks, and instructional materials. All test materials have been extensively field tested for psychometric soundness and evaluated for fairness to gender, racial, ethnic, and cultural groups. Test content was chosen for its appeal and interest to children in order to provide test takers with an engaging and motivating testing experience.

 

The ITBS provides educators with accurate and detailed information, allowing them to tailor curricula to the individual educational needs of their students and address any achievement deficiencies early in the school year.

 

While both Complete and Survey batteries are available, we are presenting only the Complete Battery, as it was the battery used when the classification data were computed.

Assessment Format:

  • Group administered

 

Administration Time:

  • 60 minutes per group*

 

*Assumes using only the Reading Comprehension, Math Concepts and Estimation, and Math Problem Solving and Data Interpretation subtests.

 

Scoring Time:

  • Scoring is automatic*

 

*Answer documents may be centrally scored by the Riverside Scoring Service® or locally scored either by hand or through use of the Riverside Local ScoringPro™ software.

 

Scoring Method:

The number of questions a student gets right on a test is the student’s raw score. By itself, a raw score has little or no meaning, and so raw scores are usually converted to other types of scores for interpretational purposes, including standard scores. Composite scores are obtained by averaging the developmental standard scores from certain component tests. The average standard score can be converted to a percentile rank, grade equivalent, or other type of score for interpretation purposes.

 

A wide range of paper reports are available; we also offer the Interactive Results Manager™ (iRM™), which is a web-based reporting application that can be used to locally analyze assessment data.

 

Scores Generated:

  • Raw score
  • Standard score
  • Percentile score
  • Grade equivalents
  • Stanines
  • Normal curve equivalents
  • Equated       
  • Lexile score
  • Composite scores
  • Subscale/subtest scores
  • Predicted scores are available 

 

Classification Accuracy

Grade345678
Criterion 1 FallHalf-filled bubbleEmpty bubbleHalf-filled bubbleEmpty bubbleEmpty bubbleEmpty bubble
Criterion 1 Winterdashdashdashdashdashdash
Criterion 1 Springdashdashdashdashdashdash
Criterion 2 Falldashdashdashdashdashdash
Criterion 2 Winterdashdashdashdashdashdash
Criterion 2 Springdashdashdashdashdashdash

Primary Sample

 

Criterion 1: State accountability test

Time of Year: Fall

 

Grade 3

Grade 4

Grade 5

Grade 6

Grade 7

Grade 8

Cut points

161

176

186

191

197

209

Base rate in the sample for children requiring intensive intervention

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Base rate in the sample for children considered at-risk, including those with the most intensive needs

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

False Positive Rate

0.13

0.07

0.12

0.03

0.07

0.06

False Negative Rate

0.28

0.43

0.27

0.61

0.44

0.46

Sensitivity

0.72

0.57

0.73

0.37

0.57

0.54

Specificity

0.87

0.94

0.89

0.97

0.94

0.94

Positive Predictive Power

0.41

0.76

0.49

0.93

0.76

0.78

Negative Predictive Power

0.96

0.86

0.96

0.64

0.65

0.84

Overall Classification Rate

0.86

0.84

0.87

0.70

0.84

0.83

Area Under the Curve (AUC)

0.90

0.91

0.91

0.90

0.91

0.91

AUC 95% Confidence Interval Lower

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

AUC 95% Confidence Interval Upper

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

At 90% Sensitivity, specificity equals

0.75

0.77

0.78

0.73

0.74

0.75

At 80% Sensitivity, specificity equals

0.82

0.85

0.84

0.83

0.85

0.84

At 70% Sensitivity, specificity equals

0.87

0.90

0.89

0.89

0.89

0.88

 

Reliability

Grade345678
RatingEmpty bubbleEmpty bubbleEmpty bubbleEmpty bubbleEmpty bubbleEmpty bubble
  1. Justification for each type of reliability reported, given the type and purpose of the tool

Not Provided

 

  1. Description of the sample(s), including size and characteristics, for each reliability analysis conducted:  

Not Provided

 

  1. Description of the analysis procedures for each reported type of reliability:

Not Provided

 

  1. Reliability of performance level score (e.g., model-based, internal consistency, inter-rater reliability).

Type of Reliability

Age or Grade

n

Coefficient

Confidence Interval

KR 20 (alpha)

Grade 3

4

0.907

Not Provided

KR 20 (alpha)

Grade 4

4

0.910

Not Provided

KR 20 (alpha)

Grade 5

4

0.920

Not Provided

KR 20 (alpha)

Grade 6

4

0.925

Not Provided

 

Disaggregated Reliability

The following disaggregated reliability data are provided for context and did not factor into the Reliability rating.

Type of Reliability

Subgroup

Age or Grade

n

Coefficient

Confidence Interval

None

 

 

 

 

 

 

Validity

Grade345678
Ratingdashdashdashdashdashdash
  1. Description of each criterion measure used and explanation as to why each measure is appropriate, given the type and purpose of the tool:

Not provided

 

  1. Description of the sample(s), including size and characteristics, for each validity analysis conducted:

Not provided

 

  1. Description of the analysis procedures for each reported type of validity:

Not provided

 

  1. Validity for the performance level score (e.g., concurrent, predictive, evidence based on response processes, evidence based on internal structure, evidence based on relations to other variables, and/or evidence based on consequences of testing), and the criterion measures.

Type of Validity

Age or Grade

Test or Criterion

n

Coefficient

Confidence Interval

None

 

 

 

 

 

 

  1. Results for other forms of validity (e.g. factor analysis) not conducive to the table format:

Not provided

 

  1. Describe the degree to which the provided data support the validity of the tool:

Not provided

 

 

Disaggregated Validity

The following disaggregated validity data are provided for context and did not factor into the Validity rating.

Type of Validity

Subgroup

Age or Grade

Test or Criterion

n

Coefficient

Confidence Interval

None

 

 

 

 

 

 

 

Results for other forms of disaggregated validity (e.g. factor analysis) not conducive to the table format:

None

Sample Representativeness

Grade345678
RatingEmpty bubbleEmpty bubbleEmpty bubbleEmpty bubbleEmpty bubbleEmpty bubble

Primary Classification Accuracy Sample

Representation: One state (Southeast), replication in two others (Midwest).

Date: Fall 2007 through Spring.

 

 

Grade 3

Grade 4

Grade 5

Grade 6

Grade 7

Grade 8

Size

11,445

6,738

11,457

6,681

6,868

11,412    

Male

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Female

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Unknown

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Other SES Indicators

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Free or reduced-price lunch

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

White, Non-Hispanic

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Black, Non-Hispanic

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Hispanic

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

American Indian/Alaska Native

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Asian/Pacific Islander

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Other

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Unknown

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Disability classification

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

First language

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Language proficiency status

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

Not Provided

 

Bias Analysis Conducted

Grade345678
RatingNoNoNoNoNoNo
  1. Description of the method used to determine the presence or absence of bias

None

 

  1. Description of the subgroups for which bias analyses were conducted

None

 

  1. Description of the results of the bias analyses conducted, including data and interpretative statements

None

 

Administration Format

Grade345678
Data
  • Group
  • Group
  • Group
  • Group
  • Group
  • Group
  • Administration & Scoring Time

    Grade345678
    Data
  • 60 minutes
  • 60 minutes
  • 60 minutes
  • 60 minutes
  • 60 minutes
  • 60 minutes
  • Scoring Format

    Grade345678
    Data
  • Automatic
  • Automatic
  • Automatic
  • Automatic
  • Automatic
  • Automatic
  • Types of Decision Rules

    Grade345678
    Data
  • None
  • None
  • None
  • None
  • None
  • None
  • Evidence Available for Multiple Decision Rules

    Grade345678
    Data
  • No
  • No
  • No
  • No
  • No
  • No