PEREZGONZALEZ Jose D (2012). BNI of kinds of corn chips (inferential statistics). Journal of Knowledge Advancement & Integration (ISSN 1177-4576), 2012, pages 305-309. [Printer friendly]
BNI of generic brands (inferences)
Some corn chips6 are sold under generic brands (eg, a supermarket brand) while others are sold under proprietary brands. Thus, it is of interest to test whether such characteristic informs about overall nutritional balance (BNI) and, thus, whether it may help choose more balanced products. As part of a research on the nutritional balance of corn chips (2012b)3, Perezgonzalez also assessed whether generic and proprietary brands differed in regards to overall nutritional balance. This article provides inferential information both about the population of products under research (foodBNI) as well as about hypothetical diets based on those products (dietBNI).
Proprietary brands tend to be more abundant than generic brands, overall providing more flavors and package sizes. Furthermore, the distribution of nutritional balance of both kinds of products also differs. Named brands tend to be extremely unbalanced7, having a mean located somewhere between BNI 48 and BNI 59 (95% confidence). Meanwhile, generic brands tend to have a somewhat higher unbalance, with their means located somewhere between BNI 63 and BNI 74 (illustration 1).
|Illustration 1: Food's nutritional balance|
|Median CI95 lower||50.78||64.37|
|Median CI95 upper||64.98||78.11|
|Mann-Whitney U||65.00 (p=0.01)|
|Mean CI95 lower||48.13||62.79|
|Mean CI95 upper||59.49||73.79|
|SD CI95 lower||10.74||5.40|
|SD CI95 upper||18.80||13.20|
|t-test (df 29)||-3.59 (p=0.001)|
|Mean diff CI95 lower||22.72|
|Mean diff CI95 upper||6.23|
|(95% confidence interval's lower and upper bounds)|
Even when both kinds of corn chips are extremely unbalanced, the difference between groups is still perceptible. Indeed, statistic tests are significant both under non-parametric assumptions (Mann-Whitney U) as well as under parametric assumptions (t-test), suggesting that corn chips by named brands are, overall, less unbalanced than those by generic brands. Such difference can be as much as between 6 and 23 units on the BNI scale (95% confidence), equivalent to a slight to moderate difference in nutritional balance between both kinds of products (illustration 1).
The type of branding also relates moderately with the BNI in a positive manner, reinforcing the suggestion that avoiding generic brands may help in choosing between 13% to 72% of more nutritionally balanced products (Adj.R) (illustration 2).
|Illustration 2: Correlations with the BNI|
|Generic brand||CI95 lower||0.13||0.16|
As part of two hypothetical diets where the corresponding generic and named products contributed the same weight of chips, the resulting nutritional balance would still be extremely unbalanced, with 95% confidence of it ranging somewhere between BNI 42.72 and BNI 52.40 for the diet based on proprietary brands, and between BNI 47.46 and BNI 62.97 for the diet based on generic brands (illustration 3).
|Illustration 3: Diet's nutritional balance corn chips|
|(Nutrients per 100g; *fiber content estimated from 'Doritos Burn'; **carbs' upper and lower bounds are reversed8)|
Jose D PEREZGONZALEZ (2012). Massey University, Turitea Campus, Private Bag 11-222, Palmerston North 4442, New Zealand. (JDPerezgonzalez).
Want to know more?
- Wiki of Science - BNI of kinds of corn chips (further knowledge)
- Two Wiki of Science pages provide further introductory and descriptive information about the nutritional balance of kinds of corn chips.
- Wiki of Science - Kinds of food and nutritional balance
- This Wiki of Science page provides more information about the nutritional balance of kinds of foods such as those sold under generic brands and those targeted to children.
- Wiki of Science - Nutritional balance of corn chips
- This Wiki of Science page provides an introduction to the BNI of corn chips, irrespective of brand.