Inconsistent calculations between metric/standard measurements.

Bug #528399 reported by Dynamite on 2010-02-26
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Weight Tracker ODS
High
Jon Thysell
2.2
Undecided
Unassigned

Bug Description

Version: WTODS 2.2.1

I'm using the metric system to record my daily weight but I found out that the reported BMI was incorrect ( I calculated my BMI using another online service). On a whim, I converted all my measurements into the standard system ( lbs/ inch ) instead of the metric system and I got completely different results.

Steps to reproduce:
1)Download a fresh copy of the spreadsheet.
2)Change the Config. Options and input a certain starting weight and height (standard format).
3)Create a bunch of fictitious (or real if you want) entries using the standard (lbs) system.
4)Record the BMI, delta Cal/day.
5)Change the Config Options and input the same weight and height but using the metric system.
6)Convert your previously entered readings to the metric system.
7)Record the BMI, delta Cal/day.
8)Compare the two values.

In my case, the recorded values differ.
I'm using the latest version of the WTODS 2.2.1

2-a) I didnot set a starting trend set.
2-b) I didnot fill all of the listed dates.

Related branches

Jon Thysell (jonthysell) wrote :

How inconsistent are the calculations? Is the BMI completely off for metric, or could it be from the rounding?

Changed in wtods:
assignee: nobody → Jon Thysell (jonthysell)
status: New → Triaged
Dynamite (dynamitebox) wrote :

Sorry for the late reply, but it’s been a pretty hectic weekend for me.

I went over the numbers again and I don’t believe that its a rounding error.

The BMI listed in the spreadsheet is bit larger than what other on-line BMI calculators suggest.

Jon Thysell (jonthysell) wrote :

I'll look into it for the next release. It's possible that I may have used an incorrect metric BMI formula.

Jon Thysell (jonthysell) on 2010-09-03
Changed in wtods:
milestone: none → 2.2.2
importance: Undecided → High
Jon Thysell (jonthysell) on 2010-09-05
Changed in wtods:
status: Triaged → Fix Committed
Jon Thysell (jonthysell) on 2010-09-05
Changed in wtods:
status: Fix Committed → Fix Released
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