faulty goods received, replacement goods is also faulty, can i get my money back?

TELLIT01

Your calculations are off.  If 2% of headsets have dead pixels you have a 1 in 50 chance of getting that first time.  You still have a 1 in 50 chance of getting on second and subsequent times.

RogerBareford

TELLIT01 said:

Your calculations are off.  If 2% of headsets have dead pixels you have a 1 in 50 chance of getting that first time.  You still have a 1 in 50 chance of getting on second and subsequent times.

The OP wants to know the chances of the two inpendant events occuring; so if it's 2% chance for it to happen once then it's correct to times the probabilities together to find out the chance of both events occuring.

_random_user_name

RogerBareford said:

TELLIT01 said:

Your calculations are off.  If 2% of headsets have dead pixels you have a 1 in 50 chance of getting that first time.  You still have a 1 in 50 chance of getting on second and subsequent times.

The OP wants to know the chances of the two inpendant events occuring; so if it's 2% chance for it to happen once then it's correct to times the probabilities together to find out the chance of both events occuring.

exactly this yes! thankyou.

longjohnjohnson

_random_user_name said:

update: the varjo reseller in the uk asked me if i wanted a 3rd headset or a refund, i opted for refund, the defective headsets are being picked up today

quick question for those who are maths savvy: a varjo employee has said the percentage of varjo aero headsets with dead pixels is 2% but i'm not sure i believe this going by the issues ive read about.

i and several others have received consecutive dead pixel headsets, so if i received 2 are my chances 0.02 x 0.02 = 0.004?

one person has had 4 consecutive headsets with dead pixels, what would be the chances of that? is it 0.02 x 0.02 x 0.02 x 0.02 = 0.00000016?

That's right but you have to bear in mind that extremely unlikely events do occur frequently given enough rolls of the dice (winning the lottery for example) and you don't know how many people have not had this issue.  People are far more likely to complain when things go wrong than comment when they work as expected.

You might be right, but there's nowhere near enough data to draw reliable conclusions.

_random_user_name

longjohnjohnson said:

_random_user_name said:

update: the varjo reseller in the uk asked me if i wanted a 3rd headset or a refund, i opted for refund, the defective headsets are being picked up today

quick question for those who are maths savvy: a varjo employee has said the percentage of varjo aero headsets with dead pixels is 2% but i'm not sure i believe this going by the issues ive read about.

i and several others have received consecutive dead pixel headsets, so if i received 2 are my chances 0.02 x 0.02 = 0.004?

one person has had 4 consecutive headsets with dead pixels, what would be the chances of that? is it 0.02 x 0.02 x 0.02 x 0.02 = 0.00000016?

That's right but you have to bear in mind that extremely unlikely events do occur frequently given enough rolls of the dice (winning the lottery for example) and you don't know how many people have not had this issue.  People are far more likely to complain when things go wrong than comment when they work as expected.

You might be right, but there's nowhere near enough data to draw reliable conclusions.

it works out that if for this to happen to 1.6 persons on average then they would need to have sold 10,000,000 headsets. they have sold nowhere near this. varjo have sold in the 1000s going by order numbers and by number of users in their official discord, which is a few hundred.

i am drawing conclusions, and that is that they have a problem with dead pixels.

Ergates

It's quite likely that the instances of dead pixels are not evenly distributed though.  So whilst over-all the instance of dead pixels could affect 2% of headsets, there could be "bad" batches of screens that have a much higher instance, and "good" batches with much lower instances.   This, in turn, could result in some retailers (or distribution centres if they're all sold directly from the manufacturer) having a higher defect rate than others - so as and when headsets are exchanged the chance of getting another faulty one is higher.

Jenni_D

Statistics are great, eh?  

GDB2222

Ergates said:

It's quite likely that the instances of dead pixels are not evenly distributed though.  So whilst over-all the instance of dead pixels could affect 2% of headsets, there could be "bad" batches of screens that have a much higher instance, and "good" batches with much lower instances.   This, in turn, could result in some retailers (or distribution centres if they're all sold directly from the manufacturer) having a higher defect rate than others - so as and when headsets are exchanged the chance of getting another faulty one is higher.

Precisely so. The UK distributor will receive a consignment, probably all made in the same factory, at roughly the same time. That batch might have say a 20% defect rate. The next 9 batches might be defect free, making the average 2%. 

So, the chance of a consumer receiving 4 defective headsets from the 20% defective batch is 0.2*0.2*0.2*0.2, which is 0.0016. 

It's interesting that it took the OP nearly 2 weeks to spot the defect. Do these things develop over time?

_random_user_name

It's interesting that it took the OP nearly 2 weeks to spot the defect. Do these things develop over time?

i don't think dead pixels develop over time. some dead pixels are easier to spot than others, plus i never used a dead pixel test website when i 1st received my headsets. i spotted the dead pixels after a few days use in the 1st headset, then in headset no.2 about 2 weeks use, by just playing games (MS flight sim). had i used the dead pixel test website straight away (which i should have) i think i would've spotted them straight away.

dead pixels aren't the preserve of varjo. i bought a meta quest 2 after the varjos went back, that had a dead pixel! got a replacement which is thankfully defect free