4 ms·

The samples were taken from a random selection of 100 of the top 1000 firms. The real question is how to make that selection of 100 firms so that statistically

by gne1963 18y ago

The samples were taken from a random selection of 100 of the top 1000 firms. The real question is how to make that selection of 100 firms so that statistically the sample size is a representative sampling. The goal is not to determine whether or not the jobs are available to those folks who may have just been laid off. The goal is to determine just how many job opening do exist in the Fortune 1000 without needing to hit every single job board of every one of those 1000 companies... surely there is a statistician who can solve that one? ;-)

nostrademons 18y ago
From the link on your page: "Yesterday we embarked on a research project to find current job openings. We started with 21 firms (with 18,839 open positions) and now we're up to data from 100 of them. (All Fortune 500)" The chance that a random sample of 100 firms are all in the top half of the sample universe is 2^100 = about a decillion. Doesn't really look random to me.
- gne1963 18y ago
  Thanks, nice catch and that post needs to be changed... momentarily... The universe was truely from the Fortune 1000 from the list publish online... not the top 500 only...
  - gne1963 18y ago
    You can see my confusion is somewhat born out by hitting this link... it is labeled 500 when actually it lists the top 1000... http://money.cnn.com/magazines/fortune/fortune500/2008/full_list/ http://money.cnn.com/magazines/fortune/fortune500/2008/full_...
    - gne1963 18y ago
      So here is the methodology: 1. Hit the site above. 2. Randomly pick a company from the list... for instance: 3. Pick Paychex Systems... company 921 on Fortunes list... 4. On their site they list 137 job openings... 5. Add that to the total... 6. Repeat until you have a representative sample size Question: Using an appropriate random number generation between 1 and 1000, what is the sample size required to then estimate the total job openings on the 1000 sites?

by gne1963 18y ago

nostrademons 18y ago

From the link on your page: "Yesterday we embarked on a research project to find current job openings. We started with 21 firms (with 18,839 open positions) and now we're up to data from 100 of them. (All Fortune 500)" The chance that a random sample of 100 firms are all in the top half of the sample universe is 2^100 = about a decillion. Doesn't really look random to me.

gne1963 18y ago
Thanks, nice catch and that post needs to be changed... momentarily... The universe was truely from the Fortune 1000 from the list publish online... not the top 500 only...
- gne1963 18y ago
  You can see my confusion is somewhat born out by hitting this link... it is labeled 500 when actually it lists the top 1000... http://money.cnn.com/magazines/fortune/fortune500/2008/full_list/ http://money.cnn.com/magazines/fortune/fortune500/2008/full_...
  - gne1963 18y ago
    So here is the methodology: 1. Hit the site above. 2. Randomly pick a company from the list... for instance: 3. Pick Paychex Systems... company 921 on Fortunes list... 4. On their site they list 137 job openings... 5. Add that to the total... 6. Repeat until you have a representative sample size Question: Using an appropriate random number generation between 1 and 1000, what is the sample size required to then estimate the total job openings on the 1000 sites?