Maybe an email to Dan Heisman would be the go.
U.S. Player Statistics

No offence, but your questions are really superficial and useless.
Let me answer them for you:
1) how can you tell? It's not that everybody is playing a USCF rated game a day, thus you can improve and still have to wait a lot of time before your rating reflects that. Let alone that you can improve and then lose a couple of games by bad luck/blunder, and your rating decreases.
2) many of the rated players might have not even bothered to improve, so this data would tell you nothing.
3) the more, the merrier
4) for some people it's one afternoon, for others is 30 years. Too much variance in that data for being useful in any way.

My questions come to a basic database access, so I can pull out my own conclusions based on statistical calculations. Please don't bother answering unless you can provide something usefull. Otherwise, you're just flaming, and not helping at all.
Again, this questions refere to pure statistics, except for the improvement play time, which would consist of chess master opinions(this is easy to find, the rest aren't). And again, the USCF database search is faulty, I can't access result pages further from the first one.
Please, help, don't flame.

I don't believe the USCF database can support the queries that you need. You probably have to contact the USCF directly. Use their website uschess.org
for me I was 1400 when I started at 16 and 20 years later i'm 1400 still because i don't play enough tournament games. so for me it looks like no effort to get to 1400 and i've done nothing since. i think my stats wouldn't tell you much.

A lot, probably the majority, of chessplayers don't seek to improve. They just go out and play either online, at a local club, or weekend big money events. I have methods for players of all ratings to improve for free and they maximize your availalbe time. See my website, linked in my profile. My video lessons group also linked in my profile has support systems in place to help you. I have premium services, all reasonably priced. I have started a video series of my chess career when I was in the 1400's 40 years ago, so the players in my private group may monitor my improvement, and learn methods to defeat players in hte classes I played against.

No, USCF database does not support my queries. Nor do they have data to provide me with.
No, your rating wouldn't tell much, but all ratings, and the comparisions and Gauss curves would help me.
And finally, no, I don't need any chess courses, as I'm not seeking improvement here, but simple data pieces.
Thanks for the help, I've got my answers from the officials.
Hello
I don't know exactly where to post this, so I'll post here hoping someone can help me:
I am writing an article regarding the US chess, and I need to know the answer to several questions I have. I tried using the USCF database, but the search query is faulty, and I cannot access the different player ratings pages. My questions are the following
Questions no. 1 – What percentage of US chess players actually saw improvements in their USCF rating in the last six months?
Question no. 2 - Out of players that are 1300-1400 what percentage were 1300-1400 a year ago?
Question no. 3 - How much do experts say to study chess a day to improve?
Question no. 4 - How long does it take the average chess player to reach a 1300 rating
As you see, most of them concern the 1200-1400 area. Unfortunately, I cannot find any useful statistics to help me answer these questions. If anyone knows or can help me, it would be really useful to me. The matter is urgent, as I need the article done by Thursday or earlier.
Best regards, E.