It is highly likely that this year's run of accidents is a statistical anomaly and there are few relevant conclusions reference the relative safety of specific aircraft makes, or models that can be inferred from this sample.
Boeing produced an interesting study summarising a number of safety metrics and statistics for the period 1988 - 2007 for those who like reviewing trends across a more meaningful set of data.
http://www.boeing.com/news/techissues/pdf/statsum.pdf
X number of incidents for a particular model over Y years due to a similar root cause (e.g. anomalous readings from a pitot system leading to ADIRU malfunctions leading to AP disconnects) would be significant however, but that is another statistical question.