Estimate ranges in column view

* lisp/org-colview-xemacs.el (org-columns-compile-map):
(org-columns-number-to-string):
(org-columns-string-to-number): Handle estimate ranges.
(org-estimate-mean-and-var):  New function.
(org-estimate-combine):  New function.
(org-estimate-print):  New function.
(org-string-to-estimate): New function.

doc/org.texi

@@ -4766,21 +4766,21 @@ Be aware that you can only have one summary type for any property you
 include. Subsequent columns referencing the same property will all display the
 same summary information.
 
-The 'est+' summary type requires further explanation. It is used for
+The @code{est+} summary type requires further explanation.  It is used for
-combining task estimates, expressed as low-high ranges. For example, instead
+combining estimates, expressed as low-high ranges.  For example, instead
 of estimating a particular task will take 5 days, you might estimate it as
 5-6 days if you're fairly confident you know how much woark is required, or
 1-10 days if you don't really know what needs to be done.  Both ranges
 average at 5.5 days, but the first represents a more predictable delivery.
 
 When combining a set of such estimates, simply adding the lows and highs
-produces an unrealistically wide result. Instead, 'est+' adds the statistical
+produces an unrealistically wide result. Instead, @code{est+} adds the
-mean and variance of the sub-tasks, generating a final estimate from the sum.
+statistical mean and variance of the sub-tasks, generating a final estimate
-For example, suppose you had ten tasks, each of which was estimated at 0.5 to
+from the sum.  For example, suppose you had ten tasks, each of which was
-2 days of work. Straight addition produces an estimate of 5 to 20 days,
+estimated at 0.5 to 2 days of work.  Straight addition produces an estimate
-representing what to expect if everything goes either extremely well or
+of 5 to 20 days, representing what to expect if everything goes either
-extremely poorly. In contrast, 'est+' estimates the full job more
+extremely well or extremely poorly. In contrast, @code{est+} estimates the
-realistically, at 10-15 days.
+full job more realistically, at 10-15 days.
 
 Here is an example for a complete columns definition, along with allowed
 values.

lisp/org-colview-xemacs.el

@@ -1700,8 +1700,7 @@ This will add overlays to the date lines, to show the summary for each day."
          (high (float (cadr v)))
          (mean (/ (+ low high) 2.0))
          (var (/ (+ (expt (- mean low) 2.0) (expt (- high mean) 2.0)) 2.0)))
-    (list  mean var)
+    (list  mean var)))
-    ))
 
 (defun org-estimate-combine (&rest el)
   "Combine a list of estimates, using mean and variance.
@@ -1715,21 +1714,21 @@ and variances (respectively) of the individual estimates."
 	      (setq var (+ var (cadr stats)))))
 	  el)
     (let ((stdev (sqrt var)))
-      (list (- mean stdev) (+ mean stdev)))
+      (list (- mean stdev) (+ mean stdev)))))
-    ))
 
 (defun org-estimate-print (e &optional fmt)
-  "Prepare a string representation of an estimate, as two numbers with a '-' in between them."
+  "Prepare a string representation of an estimate.
+This formats these numbers as two numbers with a \"-\" between them."
   (if (null fmt) (set 'fmt "%.0f"))
   (format "%s" (mapconcat (lambda (n) (format fmt n))  e "-")))
 
 (defun org-string-to-estimate (s)
-  "Convert a string to an estimate. The string should be two numbers joined with a '-'."
+  "Convert a string to an estimate.
+The string should be two numbers joined with a \"-\"."
   (if (string-match "\\(.*\\)-\\(.*\\)" s)
-      (list (string-to-number (match-string 1 s)) (string-to-number(match-string 2 s)))
+      (list (string-to-number (match-string 1 s))
-    (list (string-to-number s) (string-to-number s))
+	    (string-to-number(match-string 2 s)))
-    ))
+    (list (string-to-number s) (string-to-number s))))
-
 
 (provide 'org-colview)
 (provide 'org-colview-xemacs)

lisp/org-colview.el

@@ -1501,8 +1501,7 @@ This will add overlays to the date lines, to show the summary for each day."
          (high (float (cadr v)))
          (mean (/ (+ low high) 2.0))
          (var (/ (+ (expt (- mean low) 2.0) (expt (- high mean) 2.0)) 2.0)))
-    (list  mean var)
+    (list  mean var)))
-    ))
 
 (defun org-estimate-combine (&rest el)
   "Combine a list of estimates, using mean and variance.
@@ -1516,22 +1515,21 @@ and variances (respectively) of the individual estimates."
                 (setq var (+ var (cadr stats)))))
             el)
     (let ((stdev (sqrt var)))
-      (list (- mean stdev) (+ mean stdev)))
+      (list (- mean stdev) (+ mean stdev)))))
-    ))
 
 (defun org-estimate-print (e &optional fmt)
-  "Prepare a string representation of an estimate, as two numbers with a '-' in between them."
+  "Prepare a string representation of an estimate.
+This formats these numbers as two numbers with a \"-\" between them."
   (if (null fmt) (set 'fmt "%.0f"))
-  (format "%s" (mapconcat (lambda (n) (format fmt n))  e "-"))
+  (format "%s" (mapconcat (lambda (n) (format fmt n))  e "-")))
-  )
 
 (defun org-string-to-estimate (s)
-  "Convert a string to an estimate. The string should be two numbers joined with a '-'."
+  "Convert a string to an estimate.
+The string should be two numbers joined with a \"-\"."
   (if (string-match "\\(.*\\)-\\(.*\\)" s)
-      (list (string-to-number (match-string 1 s)) (string-to-number(match-string 2 s)))
+      (list (string-to-number (match-string 1 s))
-    (list (string-to-number s) (string-to-number s))
+	    (string-to-number(match-string 2 s)))
-    ))
+    (list (string-to-number s) (string-to-number s))))
-
 
 (provide 'org-colview)