Online Statistical Calculators for Acceptance Sampling and Quality Control
Check out Practical Acceptance Sampling: A Hands-On Guide, Second Edition. Written by Prof. Galit Shmueli (creator of SQC Online), the book is a concise introduction to the inspection of products and services for quality assurance using statistically-based sampling plans.
Yes. Applying a constant plan that does not take into account the history of batches is useless. The MIL-STD-105E switching rules and MIL-STD-1235C switching rules are an integral part of the sampling scheme.
Absolutely! Although the military standard itself was phased out in 1989, it's civilian counterparts, ANSI Z1.4 or ISO 2859 (which are essentially the same) still exist. In practice these sampling plans are widely used by many industries.
Yes. Some of our users apply acceptance sampling to processes such as auditing applications, checking errors on invoices, etc.
The problem lies in correctly using the tables. We suggest reading the standards carefully, and especially the legend and footnotes at the bottom of the particular table.
One common mistake, when arrows are present in the tables, is not adjusting the sample size according to the arrow. This is just one example.
Using our calculators is a safer alternative to the error-prone usage of the printed standards.
Here's more information about acceptance sampling and control charts.
No, sorry. We only accept payment via PayPal, which is available in 203 countries. Payment using PayPal can be done easily and quickly with any VISA, MasterCard, American Express and other credit cards or debit cards.
Note: Payment using PayPal does not require opening a PayPal account.
To renew your expired subscription, follow these steps:
At this time we are not able to upgrade or otherwise change account types. Please choose your plan carefully.
To make it easy to manage your subscription, all users in a multi-user subscription share the same username and password. The account manager (the person who subscribed) is responsible for managing the account.
Our system automatically monitors the number of users accessing the account.
Kindly check your spam folder. Occasionally, spam filters flag our email as spam. If you still can’t access your account, please contact us by using the contact form.
Sure! Just go to your user page, click on the Edit tab, enter a new username, and hit the "Save" button.
Apologies, but the answer is no. We provide an "Statistical Quality Control in the Cloud" service. You can access our calculators from any Internet-connected device worldwide.
A few account types are shared by multiple users. In order to protect these accounts, users are not able to update the account's email. If you require any assistance, just send us a message.
This issue affects only users of Internet Explorer. For best results, we recommend viewing our web site with either Google Chrome (download here) or Mozilla Firefox (download here).
Quality is free, but only to those who are willing to pay heavily for it.