I have a database of 8,100 business records. What should my sample size be to check accuracy? # of records?
479884
Well you don't need a sample if you already have access to an entire population of records! You would use a sample because you can't get a lot of records, and use that sample to give you a rough idea. If you wanted to test a hypothesis though, you should test it at a 5% significance level, or 1% to be really careful. However you need to know if there is an underlying distribution of the data, i.e. normal, etc. If what you have isn't the population of the records then use what you have, the larger the sample size the better! With more values your 'confidence interval' will be narrower, and you can be more certain of the results of your statisical analysis.
940383
Ha! Trial and error.\n\nUse a spreadsheet.
1132929
taking a very small sample would result in sampling error
124804
For an uncertainty x of 0.01 (which your 99% accuracy would be) you need 1/x^2 samples which would be 10000.  This is true for a large population (>>10000).  I believe you still need that many for 20000 population but am only 99% sure.\nSource: Best recollection of a stat course 50 years ago.
162779
As a business librarian, I suggest you try Hoovers business database:\n\nhttp://premium.hoovers.com\n\nThis is the best place to build current, accurate, and comprehensive company and business lists.
118788
There is no best copy testing method. There are different ways that you should choose depending on cost and your purpose. If you wanted to choose which copy to choose, nextidea* is the probably the best method. If you want an answer to what is the business building potential of a copy, ORS is a very good method with an accuracy of about 80%. It measures engingness, total purchase potential, convincingness, recall.. to come up with an overall potential. It compares the copy to a database of copies tested with similar consumers in the region.
1029483
Check out Microsoft\n\nOr just Google database design or database normalization.
986251
Let's say your page consists of a body of text, 10 small photos, 10 little icon things, and a couple of borders.\n\nyou have perhaps 25+ elements now.\n\nTo get one full impression may result in no less than 25 hits showing up. This is whay "hits" are a REALLY bad way of seeing how you are doing - and also why some of the more unscrupulous folks quote for hits and not impressions.\n\nHits is ALWAYS an over-inflated value and hides the real figure
462795
I guess it is because to interpret something you need a baseline or standard to compare your result with ... finding such a standard would be why you would use a database
1124246
1) Consider adding another field that records last date when the record was changed or a record version number so that you have a single field to test against.\n\n2) Then (depending on technology - is this Oracle, SQL, Access???) look at what sort of indexing you have set up.  This can dramatically speed up performance.
1032700
depends upon how big a business is if you are talking about a small business it should not be that long you want to make sure you donot miss any account or transaction that will occur and all the departments are listed in order other than that i think 5-6 pages should be enough
580723
Use your sample as if it is your population.  From your sample of size n, take, say, 1000 with-replacement samples of size n.  That means n ordered pairs for each sample.  Compute the correlation coefficient of each sample.  The bootstrap correlation coefficient would be mean correlation coefficient of the 1000 samples.  You can make a 95% confidence interval by taking the 25th and 975th smallest sample correlation coefficient as the end points.\n\nI don't know if any programs use this, so I would program it in R.  It is free to download using the link below.  Click on the CRAN link there.
463837
I am a business librarian, so I will consult Hoovers business database for the most current, accurate numbers:\n\nAmazon: 12,000\n\neBay: 8,100\n\nPayPal: 1,200
748567
Any company that bills customer must have a database which would include at least: name, address, city, state, zip, account number, product code, product name, cost, tax base, blah, blah,blah.  With that in mind, you could name a hundred companies with out thinking very long.\n-MM
303069
Do a confidence interval calculation and see if the confidence level for the data you've collected is above that required for 98%.\n\nI can show you how but given your other questions, it's clear you haven't really done any work on this yet and you're just looking to get someone to do your homework for you.\n\nLet me know if you still can't do it after you've tried a while, and I might help you out.
189640
Absolutely not!\n\nAsk for business references that can be verified, and check them.
758460
The size of the files and subsequently the size of the database - also media in a variety of formats