UPI/CVoter poll: Hillary Clinton's lead over Donald Trump narrows

[mystery-ak]

UPI/CVoter poll: Hillary Clinton's lead over Donald Trump narrows
By Eric DuVall   |   Aug. 19, 2016 at 10:12 AM

WASHINGTON, Aug. 19 (UPI) -- The UPI/CVoter daily presidential tracking poll released Friday shows Hillary Clinton leading Donald Trump by 4.2 percentage points.

The online poll shows Clinton with 49.69 percent to Trump's 45.47.

The most recent data reflect a 1.19 percentage point shift toward Trump and a loss of 1.15 percentage points by Clinton. A day earlier Clinton held a more-than 6-point lead. Over the course of a full, seven-day sample of the poll, both candidates have largely held steady, with Clinton gaining 0.2 percentage points and Trump gaining 0.3 percentage points over the past week.

The UPI/CVoter online tracking poll surveys about 200 people each day, leading to a sample size of roughly 1,400 people during any seven-day span.

Because the poll is conducted online and individuals self-select to participate, a margin of error cannot be calculated. The poll has a credibility interval of 3 percentage points. This seven-day span includes data collected from Aug. 11-17, when 1,397 individuals were surveyed. Of them, 1,009 identified themselves as likely voters.

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[sinkspur]

Because the poll is conducted online and individuals self-select to participate,

Myst, this is not a scientific poll.  Any poll that allows individuals to opt in is as big a joke as Drudge's polls.

[r9etb]

Because the poll is conducted online and individuals self-select to participate...

Although it must be noted that, with the advent of cell phones and caller ID, the accusation is also valid for telephone-based polls.

As it is, I wonder how accurate any of the polls are going to be this year.  They all seem pretty volatile, and I suspect their sample space could be skewed away from Trump's actual base.