Show all posts by userDiscussion of Boxsters and other Porsches |
We've updated our reliability stats for the Boxster and Cayman to include owner experiences through September 30, 2016. Repair frequencies, in terms of repair trips per 100 cars per year (lower is better): 2016 Boxster and Cayman: 21, low, small sample size 2015 Boxster and Cayman: 23, moderate, small sample size 2014 Boxster and Cayman: 26, moderate 2013 Boxster: 29, moderate 2009 Boxster anby mkaresh - Main Forum
We've updated our reliability stats for the Boxster and Cayman to include owner experiences through June 30, 2016. Reliability information elsewhere is based on a survey conducted in April 2015--well over a year ago. Repair frequencies, in terms of repair trips per 100 cars per year (lower is better): 2016 Boxster and Cayman: 30, moderate, small sample size 2015 Boxster and Cayman: 24, moderaby mkaresh - Main Forum
We've updated our reliability stats for the Boxster and Cayman to include owner experiences through the end of 2015, about eight months ahead of other sources. In terms of repair trips per 100 cars per year--lower is better: 2015 Boxster and Cayman: 9, low, small sample size 2014 Boxster and Cayman: 12, low 2013 Boxster and Cayman: 22, low 2009 Boxster and Cayman: 32, low, small sample size 2by mkaresh - Main Forum
We've updated our reliability stats for the Boxster to include owner experiences through September 30, 2015. Repair frequencies, in terms of repair trips per 100 cars per year: 2015 Boxster: 11, low, very small sample size 2014 Boxster: 11, low 2013 Boxster: 17, low 2009 Boxster: 40, low, very small sample size 2008 Boxster: 27, low 2007 Boxster: 61, moderate 2006 Boxster: 32, low 2005 Boxsteby mkaresh - Main Forum
Our reliability stats for the Boxster and Cayman now cover the year ending June 30, 2015. (Others are over a year behind, and so report how these cars were doing when a year younger.) Repair trips per 100 cars: 2015 Boxster: 0, low, very small sample size 2014 Boxster: 14, low 2013 Boxster: 10, low 2008 Boxster: 29, low 2007 Boxster: 53, low 2006 Boxster: 29, low 2005 Boxster: 42, low 2004 Boby mkaresh - Main Forum
So, how have these cars been doing lately? Our reliability stats for the Boxster and Cayman now include owner experiences through March 31, 2015. (Others are nearly a year behind.) In terms of repair trips per 100 cars per year ("low" is best): 2014 Boxster and Cayman: 17, low 2013 Boxster: 13, low 2008 Boxster and Cayman: 23, low 2007 Boxster and Cayman: 53, low 2006 Boxster and Cayman: 29by mkaresh - Main Forum
We've updated our reliability stats for the Boxster to include owner experiences through the end of 2014. Repair frequencies, in terms of repair trips per 100 cars per year: 2014 Boxster: 21, low 2013 Boxster: 11, low 2008 Boxster: 19, low 2007 Boxster: 49, low 2006 Boxster: 30, low 2005 Boxster: 40, low 2004 Boxster: 44, low, small sample size 2003 Boxster: 54, low 2002 Boxster: 36, low 2001by mkaresh - Main Forum
We've updated our reliability stats for the Boxster to include owner experiences through September 30, 2014. Repair frequencies, in terms of repair trips per 100 cars per year: 2014 Boxster: 20, low 2013 Boxster: 13, low 2008 Boxster: 23, low 2007 Boxster: 36, low 2006 Boxster: 40, low 2005 Boxster: 45, low 2004 Boxster: 42, low, small sample size 2003 Boxster: 53, low 2002 Boxster: 68, low,by mkaresh - Main Forum
We've updated our reliability stats for the Boxster to include owner experiences through June 30, 2014 (making them about 14 months ahead of some others). Repair frequencies, in terms of repair trips per 100 cars per year: 2014 Boxster: 18, low 2013 Boxster: 16, low 2008 Boxster: 30, low 2007 Boxster: 33, low 2006 Boxster: 44, low 2005 Boxster: 45, low 2004 Boxster: 61, low, small sample sizeby mkaresh - Main Forum
Our reliability stats for the Boxster now include owner experiences through March 31, 2014, making them nearly a year ahead of other sources. Repair frequencies, in terms of repair trips per 100 cars per year: 2014 Boxster: 11, low 2013 Boxster: 0, low, small sample size 2008 Boxster: 31, low 2007 Boxster: 53, moderate 2006 Boxster: 47, low 2005 Boxster: 43, low 2004 Boxster: 35, low, small sby mkaresh - Main Forum
We've updated our reliability stats for the Boxster to include owner experiences through December 31, 2013. Repair frequencies, in terms of repair trips per 100 cars per year: 2013 Boxster: 0, low, small sample size 2008 Boxster: 33, low 2007 Boxster: 47, low 2006 Boxster: 39, low 2005 Boxster: 40, low 2004 Boxster: 47, low, small sample size 2003 Boxster: 52, low 2002 Boxster: 85, moderate,by mkaresh - Main Forum
We've updated our reliability stats for the Boxster and Cayman to include owner experiences through September 30, 2013. Repair frequencies, in terms of repair trips per 100 cars per year: 2008 Boxster: 29, low 2007 Boxster: 46, low 2006 Boxster: 26, low 2005 Boxster: 22, low 2004 Boxster: 42, low, small sample size 2003 Boxster: 60, low 2002 Boxster: 62, low 2001 Boxster: 56, low 2000 Boxsterby mkaresh - Main Forum
We've updated our reliability stats for the Boxster and Cayman to include owner experiences through March 31, 2013. Repair frequencies, in terms of repair trips per 100 cars per year: 2008 Boxster: 38, low 2007 Boxster: 43, low 2006 Boxster: 21, low 2005 Boxster: 21, low 2004 Boxster: 52, low, small sample size 2003 Boxster: 48, low 2002 Boxster: 64, low 2001 Boxster: 46, low 2000 Boxster: 23,by mkaresh - Main Forum
We have updated reliability stats for the Boxster and Cayman that include owner experiences through September 30, 2012. Repair frequencies, in terms of repair trips per 100 cars per year: 2008: 42, about average, stricter recalibrated scale 2007: 29, better than average 2006: 38, better than average 2005: 34, better than average 2004: 50, better than average, small sample size 2003: 46, bby mkaresh - Main Forum
We have updated reliability stats for the Boxster and Cayman that include owner experiences through June 30, 2012. Repair frequencies, in terms of repair trips per 100 cars per year: 2008: 42, about average, stricter recalibrated scale 2007: 34, better than average 2006: 45, better than average 2005: 33, better than average 2004: 29, better than average, small sample size 2003: 38, betterby mkaresh - Main Forum
Quotep-wagen I was wondering why there is no info listed for 1997 and 1998 models. Not enough owners signed up. The 1998 is only three short, though.by mkaresh - Main Forum
We have updated reliability stats for the Boxster and Cayman that include owner experiences through December 31, 2011. Repair frequencies, in terms of repair trips per 100 cars per year: 2008: 31, better than average 2007: 72, about average, might be high because final year of standard warranty 2006: 49, better than average 2005: 56, better than average 2004: 16, better than average, smallby mkaresh - Main Forum
We have updated reliability stats for the Boxster and Cayman that include owner experiences through September 30, 2011. Repair frequencies, in terms of repair trips per 100 cars per year: 2008: 28, better than average 2007: 75, about average, might be high because final year of standard warranty 2006: 39, better than average 2005: 72, about average 2004: 44, better than average, small sampby mkaresh - Main Forum
I should clarify my earlier comment. About forty-percent of the people who sign up never respond, no matter what. Many intend to, but it's just one of those things that will always be put off until tomorrow. (I have quite a few such things myself.) The non-participation of this group doesn't so much directly distort the results as reduce the sample size, which reduces the precision of the resultsby mkaresh - Main Forum
Luckily the great majority of participants respond following the end of each quarter as the emails request, whether or not they've had a repair. If there's no repair only an approximate odometer reading is needed--takes me about 10 seconds for my own cars. With those who respond more sporadically we follow-up with special emails to fill the gaps. When we do have an isolated response for a repaiby mkaresh - Main Forum
I don't think agendas are much of a factor given the way the survey and survey process are designed. Willingness to participate is more of a factor, but any correlation this might have with the owner's experience with the car is minimized by the research design. Not eliminated, but not a source of substantial distortion. This comes through in the reported repair frequencies--they'd be much higheby mkaresh - Main Forum
I don't have enough data to nail down the cumulative failure rate, partly because this isn't the primary focus of the survey. One thing that has crossed my mind: for serious problems that seem to be common I could conduct special surveys of those who've signed up to participate. Many other things on my plate right now, but I'm going to seriously consider doing this. Based on what I have seen I dby mkaresh - Main Forum
I think you're confusing the failure rate for the past year with the combined failure rate for all years since the cars left the factory, and then reading the variance as extending from the low end of the former to the high end of the latter.by mkaresh - Main Forum
Sorry, after I posted I realized that might be who you were responding to. One unique way we compensate for the lack of a random sample: the survey collects data going forward, from the month the person signs up. So any past experiences that might have influenced them to participate won't influence the results. Other reliability surveys and pretty much all forum polls are retrospective, and soby mkaresh - Main Forum
Plenty of stats classes in the past here. I'm not sure which formula you're using, but the ones I've used are based on the variance (in the statistical sense, you've used the word differently) and do not include the population at all. I use a metric with a relatively low variance to make the most of small sample sizes. I did find a widget like the one you seem to have used here: But lower onby mkaresh - Main Forum
Over the course of the 2010 calendar year, yes. The total percentage will be higher, because more failed before 2010. On the other hand, last time I checked none had been reported since the beginning of 2011. I think there's a chance that the great majority of those than are going to fail have already failed at this point.by mkaresh - Main Forum
The size of the population has no bearing on the necessary sample size. This fact is the foundation of all research based on samples. With the planet-9 threads, that's thirty cars out of how many? And how long ago did those failures occur? Were they all within the past year? Or over the entire lifetimes of the cars? With CR, what failure rate does a "much worse than average" rating for engine iby mkaresh - Main Forum
We have updated our car reliability stats for the Boxster and Cayman that include owner experiences through March 31, 2011. Repair frequencies, in terms of repair trips per 100 cars per year: 2008: 41, better than average 2007: 65, about average 2006: 54, better than average 2005: 73, about average 2004: 62, better than average, small sample size 2003: 65, better than average 2002: 112,by mkaresh - Main Forum
Sorry, just saw this. This is largely handled through the methodology. The survey is continuous, not a one-time event, and collects data going forward rather than asking about repairs that occurred before someone joined.by mkaresh - Main Forum
We have updated reliability stats for the Boxster and Cayman that include owner experiences through December 31, 2010. Other sources of car reliability information won't cover the months since last April until the summer or even fall of this year. Repair frequencies, in terms of repair trips per 100 cars per year: 2008: 39, better than average 2007: 59, about average 2006: 49, better than avby mkaresh - Main Forum