Factbox: Opinion polls show shift towards 'In' for EU vote

Opinion polls published in the days before Thursday's referendum have mostly shown a shift towards keeping Britain in the European Union, but there are some signs that the "In" camp's momentum has stalled and the race still looks too close to call.

Prior to the most recent polls, in the period between Jun 10 and Jun 16, "Out" led in seven of nine polls, rattling investors in markets around the world.
 
Betting odds, provided by gambling firm Betfair, gave the "In" campaign a 75 percent probability of winning, up from as low as 59 percent last week.
 
Here is a summary of the most recent polls:
 
Survation/IG – ‘In’ ahead by 1 point
 
A Survation poll of just over 1,000 people for IG Group on Tuesday put the "In" camp at 45 percent, ahead of "Out" on 44 percent, representing a narrowing of its lead.
 
Survation's previous poll, for the Mail on Sunday newspaper and published late on Saturday, had shown "In" ahead of "Out" by 3 percentage points.
 
The new Survation poll was conducted by telephone on Monday. Excluding the 11 percent of respondents who answered "don't know", the survey gave "In" a lead of 51-49 percent, IG said.
 
ORB/Daily Telegraph – ‘In’ ahead by 7 points
 
An ORB telephone poll of 800 people for the Daily Telegraph newspaper, published late on Monday, put support for "In" at 53 percent, with "Out" on 46 percent.
 
The previous poll by ORB, published a week earlier, had put the "Out" camp ahead by one point.
 
"All the signs of ORB's latest and final poll point to a referendum that will truly come down to the wire," said Lynton Crosby, a political strategist who advised the ruling Conservative Party at the last national election in 2015.
 
YouGov/The Times – ‘Out’ ahead by 2 points
 
A YouGov online poll for the Times newspaper, also published late on Monday, gave "Out" a 44-42 percent lead over "In." YouGov's previous poll had put "In" one point ahead when it was published in the Sunday Times newspaper.
 
The survey interviewed 1,652 people between Friday and Sunday. Of those questioned, 9 percent said they did not know how they would vote and 4 percent said they would not vote.
 
Natcen – ‘In’ ahead by 6 points
 
A poll from the social research organisation conducted between May 16 and Jun 12 put the "In" camp on 53 percent, while the "Out" camp was on 47 percent.
 
The survey, conducted online and by telephone, had a sample size of 1,632 respondents. Sixty-five percent of the interviews were done by May 26.
 
Survation/Mail on Sunday poll – ‘In’ ahead by 3 points
 
A Survation telephone poll for the Mail on Sunday put support for "In" at 45 percent, with "Out" on 42 percent.
 
Survation's previous poll, published on June 16 for financial markets firm IG, had shown "Out" ahead of "In" by the same margin.
 
The new Survation poll was conducted on Friday and Saturday, after the murder of a member of parliament from the opposition Labour party who was a staunch "In" supporter.
 
John Curtice, a polling expert from Strathclyde University, told the Mail on Sunday it was "far from clear" if the turnaround was the result of criticism of the Leave campaign following the death of Jo Cox.
 
Six more polls on EU voting intentions are due to be published in the coming days:
 
Tuesday - The Times is to publish a further YouGov online poll before the referendum, possibly as soon as Tuesday, although the timing is uncertain.
 
Wednesday - Details of a telephone poll by ComRes for ITV television and the Daily Mail newspaper are expected to be published.
 
Polling firms Opinium and TNS are also expected to publish their latest findings. Both are online surveys.
 
Thursday - Details of a telephone poll by Ipsos MORI for the Evening Standard newspaper are expected to be published.
 
The findings of a YouGov poll, based on interviews conducted online on Thursday, are due to be announced by Sky News after the close of voting at 2100 GMT.