Descriptive Analysis I - Measures of Central Tendency

The script begins by creating a 'height_and_weight_20' dataset using internal 'datalines'. It contains variables for ID, sex, height (ht_in), and weight (wgt_lbs). Then, it uses 'PROC MEANS' to calculate descriptive statistics (number of observations, mean, median, mode, standard deviation, minimum, maximum) for height and weight, with a precision of two decimal places. Comments in the original source code point out 'red flags' concerning missing data for weight and an impossible value (-69) for height.

Data Analysis

Type : INTERNAL_CREATION

Data is created directly in the script via a DATA STEP with `datalines`.

1 Code Block

DATA STEP Data

Explanation :
This DATA STEP block creates the 'height_and_weight_20' dataset by reading raw data provided in the `datalines`. It defines four variables: `id` (character), `sex` (character), `ht_in` (numeric for height in inches), and `wgt_lbs` (numeric for weight in pounds). Missing values (periods) are present for sex and weight, and a clearly erroneous value (-69) is included for height, which is noted as a 'red flag' in the original comments.

Copied!

1	DATA height_and_weight_20;
2	INPUT id $ sex $ ht_in wgt_lbs;
3	DATALINES;
4	001 Male 71 190
5	002 Male 69 175
6	003 Female 64 130
7	004 Female 65 154
8	005 . 73 173
9	006 Male 69 182
10	007 Female 68 .
11	008 . 73 185
12	009 Female 71 157
13	010 Male 66 155
14	011 Male 71 213
15	012 Female 69 151
16	013 Female 66 147
17	014 Female 68 196
18	015 Male 75 212
19	016 Female -69 190
20	017 Female 66 194
21	018 Female 65 176
22	019 Female 65 176
23	020 Female 65 102
24	RUN;

2 Code Block

PROC MEANS

Explanation :
This 'PROC MEANS' procedure is used to calculate descriptive statistics for the variables `ht_in` and `wgt_lbs` from the `height_and_weight_20` dataset. The requested statistics are the number of observations (n), mean, median, mode, standard deviation (std), minimum (min), and maximum (max). The `maxdec=2` option limits the display of decimals to two digits.

Copied!

1
2	PROC MEANS
3	DATA = height_and_weight_20 n mean median mode std min max maxdec=2;
4	var ht_in wgt_lbs;
5	RUN;
6

This material is provided "as is" by We Are Cas. There are no warranties, expressed or implied, as to merchantability or fitness for a particular purpose regarding the materials or code contained herein. We Are Cas is not responsible for errors in this material as it now exists or will exist, nor does We Are Cas provide technical support for it.

Retour à la liste