Title
TWOPHASE SAMPLING: SOME ASPECTS OF REGRESSION CUM RATIO PRODUCT ESTIMATORS,Used
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Introduction has been given in Chapter 1. In Chapter 2, history of twophase sampling and some wellknown estimators along with their mean square errors and biases are given. Some regression cum ratio product estimators proposed by Hanif et al. (2009, 2010) and Hamad and Hanif (2011) in single and twophase sampling using two auxiliary variables are discussed in chapter 3 and 4. The empirical study of those estimators is undertaken in Chapter 5.
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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 :
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