Title
Measurement in the Service of Mathematics Education Research: The Case of Cognitively Guided Instruction,Used
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The purpose of this study is to demonstrate one iterate of a process for developing a measurement instrument for student knowledge within educational interventions. Student mathematical knowledge is framed within Cognitively Guided Instruction (CGI) and its tenets. That is, the construct underlying the measurement instrument corresponded with student knowledge in CGI contexts. Similarly, the operational definitions of the construct were taken from the CGI literature on student knowledge and how that knowledge develops over time. Items types and content were arranged according to a Guttman pattern, and administered to kindergarten and first grade students with clinical interviews. Student scores were analyzed using Item Response Theory (IRT) and its methods of locating student knowledge and items on a common, latent continuum. In the IRT modeling of student responses and items, one dimension was ultimately extracted, with minor violations of local independence, resulting in a 2PL IRT model. The overall model fit well, with expected as estimated Item Characteristic Curves for items. Items fit well, and covered a wide range of values on the latent continuum.
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Shipping & Returns
Shipping
We ship your order within 2–3 business days for USA deliveries and 5–8 business days for international shipments. Once your package has been dispatched from our warehouse, you'll receive an email confirmation with a tracking number, allowing you to track the status of your delivery.
Returns
To facilitate a smooth return process, a Return Authorization (RA) Number is required for all returns. Returns without a valid RA number will be declined and may incur additional fees. You can request an RA number within 15 days of the original delivery date. For more details, please refer to our Return & Refund Policy page.
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Warranty
We provide a 2-year limited warranty, from the date of purchase for all our products.
If you believe you have received a defective product, or are experiencing any problems with your product, please contact us.
This warranty strictly does not cover damages that arose from negligence, misuse, wear and tear, or not in accordance with product instructions (dropping the product, etc.).
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Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
We accept payments with :
Visa, MasterCard, American Express, Paypal, Shopify Payments, Shop Pay and more.