What is Wrong with the Yahoo Charts?

[TromboneAl]

I like the Yahoo stock charts:

but lately they are just wrong. For example, this shows the S&P being up .1% when it's really up 2.08%. It's been like this for days -- am I reading it correctly??

 

[FinallyRetired]

I read it the same way as you. I selected just about every chart option they offer to see if the problem involved one of their options, but they all show the same incorrect y axis when it's scaled to % (as it is when one does a comparison). The line graph is correct, but the % scale is wrong.

 

[FIRE'd@51]

The problem appears to be with a bad data point for the previous close. Yesterday's close was 696.33, not 710.53.

 

[toofrugalformycat]

Seems like they're using today's open, not yesterday's close. I noticed that yesterday. But today that's not quite right either, but closer to right than yesterday's close.

 

[TromboneAl]

Oh, I got it now, they look into the future and use the closing value as the zero percent line. Good to know.

 

[al_bundy]

yahoo charts have been flaky for years. currently i can't get the new chart style in IE8, but works fine in Firefox and Safari 4.

i like to use stockcharts, but you have to pay to set up portfolios.