@property  <EOL><INDENT>def inferred_freq(self):<DEDENT>
try:<EOL><INDENT>return frequencies.infer_freq(self)<EOL><DEDENT>except ValueError:<EOL><INDENT>return None<EOL><DEDENT>
Tryies to return a string representing a frequency guess,
generated by infer_freq.  Returns None if it can't autodetect the
frequency.