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

PEREZGONZALEZ Jose D (2012). BNI of kinds of potato chips (inferential statistics). Journal of Knowledge Advancement & Integration (ISSN 1177-4576), 2012, pages 292-295. [Printer friendly]

BNI of generic brands (inferences)

Some potato 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 the type of brand informs about overall nutritional balance (BNI) and, thus, whether it may help choose more balanced products. As part of his research on the nutritional balance of potato chips, Perezgonzalez (2012b)3 also assessed whether generic and proprietary brands differed in regards to overall nutritional balance. This article provides inferential information both about the sample 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, also providing more flavors and package sizes. Notwithstanding this, the distribution of nutritional balance between both kinds of product is quite similar, with 95% confidence that their medians and means will be found in practically the same range of balance, respectively (illustration 1). This range is a bit larger for the population of generic brands, probably due to its smaller availability.

Illustration 1: Food's nutritional balance
Non-parametric Generic brand
No Yes
Median CI95 lower 79.15 76.16
Median CI95 upper 86.75 88.60
SPR lower 5.81 3.13
SPR upper 13.40 15.58
Parametric Generic brand
No Yes
Mean CI95 lower 83.58 80.41
Mean CI95 upper 89.82 91.31
SD CI95 lower 8.58 6.30
SD CI95 upper 12.90 13.38
(95% confidence interval's lower and upper bounds)

The similarity of both groups is compounded further when looking at any differences between them. Indeed, there is no difference from a practical perspective (equivalent to less than 0.8% in nutritional balance), the effect size of the group difference is equally negligible (d=0.08), and statistic tests are non-significant both under non-parametric assumptions (Mann-Witney U=331, p=0.64) and under parametric assumptions (t-test(df 61)=0.27, p=0.79).


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 highly unbalanced, with 95% confidence of it ranging somewhere between BNI 65.68 and BNI 75.20 for the diet based on proprietary brands, and between BNI 63.77 and BNI 77.26 for the diet based on generic brands (illustration 2).

Illustration 2: Diet's nutritional balance (potato chips)
Named brands Protein Carbs Sugar Fat Sat.fat Fiber Sodium BNI
CI95 lower 5.9 51.7** 1.5 31.9 9.4 4.4* 587.9 65.68
CI95 upper 6.4 49.7** 2.1 32.9 12.7 4.4* 721.8 75.20
Generic brands Protein Carbs Sugar Fat Sat.fat Fiber Sodium BNI
CI95 lower 5.0 50.8** 1.0 32.1 12.7 4.4* 463.7 63.77
CI95 upper 5.4 49.8** 1.5 34.0 16.0 4.4* 715.0 77.26
(Nutrients per 100g; *fiber content estimated from USDA database5; **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 potato chips (further knowledge)
Two Wiki of Science pages provide further introductory and descriptive information about the nutritional balance of kinds of potato 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 potato chips
This Wiki of Science page provides an introduction to the BNI of potato chips, irrespective of brand.


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