Is anyone familiar with any statistics regarding how many religious jews "go off the derech"?

To be clear, I am not asking about assimilation rates which are relatively easy to find. I would like to see some statistics regarding how often orthodox jews stop practicing Judaism.

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    This question is interesting, but unfortunately not on topic. You could see the book "Off the Derech" by Faranak Margolese, though. – Y     e     z Mar 29 '15 at 19:57
  • @yEz Would it be on topic to ask how many orthodox jews do not go off the derekh? Or is this a jews vs judaism thing? compare for instance to judaism.stackexchange.com/q/4987/759 which was left open – Double AA Mar 29 '15 at 19:58
  • @DoubleAA I figured it is about Jews and not Judaism. I would close the other one too, although I could hear someone argue about that one (this one seems more obvious to me). – Y     e     z Mar 29 '15 at 20:04
  • I know someone who did their dissertation on OTD ,will try to find out – sam Mar 29 '15 at 20:11
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    @Meh Here is the PEW study on American Judaism denominational switching. If you hover the cursor over "Orthodox" it shows you their survey results for percentages of denominational switches from orthodoxy. – Y     e     z Mar 30 '15 at 13:37

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