Load sample data.

loadhospital

The dataset array,hospital, has 7 variables (columns) and 100 observations (rows).

Compute summary statistics by category.

The variableSexis a nominal array with two levels,男性andFemale. Compute the minimum and maximum weights for each gender.

stats = grpstats(hospital,'Sex',{'min','max'},'DataVars','Weight')

stats = Sex GroupCount min_Weight max_Weight Female Female 53 111 147 Male Male 47 158 202

The dataset array,stats, has observations corresponding to the levels of the variableSex. The variablemin_Weightcontains the minimum weight for each group, and the variablemax_Weightcontains the maximum weight for each group.

Compute summary statistics by multiple categories.

The variableSmokeris a logical array with value1for smokers and value0for nonsmokers. Compute the minimum and maximum weights for each gender and smoking combination.

stats = grpstats(hospital,{'Sex','Smoker'},{'min','max'},...'DataVars','Weight')

stats = Sex Smoker GroupCount min_Weight max_Weight Female_0 Female false 40 111 147 Female_1 Female true 13 115 146 Male_0 Male false 26 158 194 Male_1 Male true 21 164 202

The dataset array,stats, has an observation row for each combination of levels ofSexandSmokerin the original data.