BNI of kinds of corn chips (inferential statistics) - 2012

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
Non-parametric Generic brand
No Yes
Median CI95 lower 50.78 64.37
Median CI95 upper 64.98 78.11
SPR lower 8.73 4.27
SPR upper 22.93 18.00
Mann-Whitney U 65.00 (p=0.01)
Parametric Generic brand
No Yes
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
rho r
Generic brand CI95 lower 0.13 0.16
CI95 upper 0.73 0.75
Adj.R CI95 lower 0.13
CI95 upper 0.72


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
Named brands Protein Carbs Sugar Fat Sat.fat Fiber Sodium BNI
CI95 lower 6.7 60.1 1.7 24.6 6.3 3.7* 466.2 42.72
CI95 upper 8.8 57.8 3.2 25.8 9.7 3.7* 631.8 52.40
Generic brands Protein Carbs Sugar Fat Sat.fat Fiber Sodium BNI
CI95 lower 5.8 61.7 1.4 24.8 9.7 3.7* 585.6 47.46
CI95 upper 6.6 56.0 3.9 25.6 11.0 3.7* 789.2 62.97
(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. (JDPerezgonzalezJDPerezgonzalez).

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.


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