code.utf8.md

PROVAS + LABS

p_l_color <- provas_labs_nota  %>% select(-aluno,- X, -X.1)  %>% rename(
    facade = hasFacade,
    controller = hasController,
    herança = useInheritance,
    interface = useInterface,
    classes_abstratas = useAbstractClass,
     exception = useException,
     documentação = hasDoc,
     testes = hasTests,
    hashMap = usedHashMap   )
autoplot(prcomp(p_l_color), data = provas_labs_nota, colour = 'X.1', loadings = TRUE, loadings.label = TRUE) + labs(color="nota")

pca <- prcomp(p_l_color)
hmm <- summary(pca)

difs.pca <- prcomp(p_l_color)
difs.pca.df <- data.frame(difs.pca$rotation)
kable(difs.pca.df, format = 'html') %>% kable_styling(bootstrap_options = c('hover', 'striped'))

	PC1	PC2	PC3	PC4	PC5	PC6	PC7	PC8	PC9	PC10	PC11
facade	0.3014265	-0.2046022	0.0627942	-0.1857731	0.1206075	0.0945890	-0.2791529	-0.5966525	-0.2430271	0.5588822	0.0000000
controller	-0.0237928	-0.0236780	0.9339872	-0.0314321	0.0841605	0.2440304	-0.0840140	0.2204918	0.0402898	0.0402621	0.0000000
herança	0.3370666	-0.2950991	0.1173282	-0.1722173	-0.1198075	0.1129027	0.1372956	-0.3937859	-0.0808527	-0.7404880	0.0000000
interface	-0.2644563	0.0646584	0.0641857	-0.7397138	-0.0821679	-0.1289389	0.4253380	-0.1547561	0.3508211	0.1525509	0.0000000
classes_abstratas	0.3207531	-0.3093307	0.1078648	0.3351746	-0.5554753	-0.1431556	0.4800215	0.0670749	0.1126197	0.3174995	0.0000000
exception	-0.1012679	0.0876481	-0.2116206	0.0356236	-0.2227955	0.9208845	0.0835755	-0.0442867	0.1537581	0.0758719	0.0000000
hashCode	-0.3779977	-0.5803891	-0.0508939	0.0403518	0.1119610	0.0334247	-0.0043972	0.0398717	-0.0263366	0.0096234	0.7071068
equals	-0.3779977	-0.5803891	-0.0508939	0.0403518	0.1119610	0.0334247	-0.0043972	0.0398717	-0.0263366	0.0096234	-0.7071068
documentação	0.3956926	-0.2809191	-0.1650209	-0.3685548	-0.1632183	0.0126118	-0.4896119	0.4535192	0.3594047	0.0087678	0.0000000
testes	0.1266961	-0.0304288	-0.0895789	-0.3561922	-0.0056547	0.1256082	0.2713889	0.4321604	-0.7537519	0.0613117	0.0000000
hashMap	-0.3917884	0.0969591	0.0947854	-0.0899552	-0.7398189	-0.1242463	-0.4055083	-0.1195419	-0.2732698	-0.0620623	0.0000000

PROVAS

	PC1	PC2	PC3	PC4	PC5	PC6	PC7	PC8	PC9	PC10	PC11
facade	0.1534928	0.3898197	0.2884151	0.3666744	-0.5334859	0.5025275	-0.1433621	0.0950971	0.1934749	0.0517429	0.0000000
controller	0.1271979	0.4038966	-0.2746450	0.3398313	-0.1471735	-0.7013192	-0.3396478	-0.0188626	0.0216925	0.0087915	0.0000000
herança	0.1965294	0.5253283	0.4584252	-0.2125907	0.2142610	-0.1113295	0.2160075	0.0945013	-0.5416412	0.1509671	0.0000000
interface	0.2151762	-0.3356680	0.4641218	0.4973154	0.1631274	-0.3037867	0.3634557	0.2416908	0.2623717	-0.0066456	0.0000000
classes_abstratas	0.0745595	0.4405093	0.0073830	-0.3081341	0.3921356	0.0216748	0.0612361	0.0522781	0.7173266	-0.1735251	0.0000000
exception	-0.0636455	-0.1145711	0.3144014	-0.5203181	-0.6263875	-0.3781933	0.1381755	-0.1210164	0.2080583	0.0287474	0.0000000
hashCode	0.6512211	-0.1357058	-0.1567419	-0.1448195	-0.0537301	0.0539946	-0.0280707	0.0092955	-0.0313414	-0.0655384	-0.7071068
equals	0.6512211	-0.1357058	-0.1567419	-0.1448195	-0.0537301	0.0539946	-0.0280707	0.0092955	-0.0313414	-0.0655384	0.7071068
documentação	-0.0810502	0.0406650	0.0830982	0.0188292	-0.0965331	-0.0207713	0.0088699	0.1452755	-0.1985509	-0.9561178	0.0000000
testes	0.0360140	-0.2178226	0.4925365	-0.1080248	0.2305092	-0.0233740	-0.7988297	-0.0664466	0.0222806	-0.0165361	0.0000000
hashMap	0.0983978	0.0561947	0.1352325	0.1946802	0.0827999	0.0250639	0.1506704	-0.9381817	0.0123975	-0.1429951	0.0000000

LABS

	PC1	PC2	PC3	PC4	PC5	PC6	PC7	PC8	PC9	PC10	PC11
facade	-0.0381583	0.0052589	-0.0150326	0.0540451	-0.0050227	-0.0247473	0.0168871	0.0150447	0.7754757	0.6267836	0.0000000
controller	-0.0227900	-0.5353334	0.4646043	-0.6491583	-0.1530988	-0.1890836	0.0031252	0.1220469	0.0200568	0.0337004	0.0000000
herança	0.0287880	0.0328046	-0.0095351	-0.0493993	0.0279975	0.0139218	-0.0218234	0.0898357	0.6265013	-0.7704126	0.0000000
interface	0.0153635	-0.2918807	-0.4782772	-0.2649196	0.0926442	0.5161388	-0.5794227	0.0513669	0.0020030	0.0477775	0.0000000
classes_abstratas	0.1265168	0.6501957	0.4595077	-0.2880933	-0.1996114	0.4070319	-0.2398439	-0.0351743	0.0058007	0.0527096	0.0000000
exception	0.0129205	-0.0303882	-0.1041376	0.2405897	-0.8224382	-0.2961038	-0.3996668	0.0736184	-0.0005850	-0.0307580	0.0000000
hashCode	0.6792908	-0.1277453	0.0666548	0.1108805	0.0442590	-0.0010831	-0.0200867	-0.0507439	0.0137951	0.0194679	0.7071068
equals	0.6792908	-0.1277453	0.0666548	0.1108805	0.0442590	-0.0010831	-0.0200867	-0.0507439	0.0137951	0.0194679	-0.7071068
documentação	0.1781619	0.4047312	-0.3419956	-0.4108881	0.2289776	-0.5771548	-0.1739391	0.3123015	-0.0403773	0.0608708	0.0000000
testes	-0.0355314	0.0314401	-0.0654377	-0.1848227	0.0504255	-0.2530367	-0.1809928	-0.9243748	0.0595717	-0.0442861	0.0000000
hashMap	0.1578294	0.0775148	-0.4505065	-0.3668669	-0.4382103	0.2157589	0.6184006	-0.1017912	0.0115544	0.0062807	0.0000000

REGRESSAO - PROVAS

p_nota = provas_nota %>% select(-aluno, -X, -X.2, -X.3, -X.4, -X.5) %>% na.omit() 
mod <- lm(X.1 ~ hasFacade +  hasController + useException + useInheritance + usedHashMap + hasTests + equals + hashCode + useInterface + useAbstractClass, 
          data = p_nota)
mod

## 
## Call:
## lm(formula = X.1 ~ hasFacade + hasController + useException + 
##     useInheritance + usedHashMap + hasTests + equals + hashCode + 
##     useInterface + useAbstractClass, data = p_nota)
## 
## Coefficients:
##      (Intercept)         hasFacade     hasController      useException  
##          4.01584          -0.60508          -0.03655           0.28476  
##   useInheritance       usedHashMap          hasTests            equals  
##          0.05499           0.39235           3.02713           0.08197  
##         hashCode      useInterface  useAbstractClass  
##               NA           1.45936           1.02445

summary(mod)

## 
## Call:
## lm(formula = X.1 ~ hasFacade + hasController + useException + 
##     useInheritance + usedHashMap + hasTests + equals + hashCode + 
##     useInterface + useAbstractClass, data = p_nota)
## 
## Residuals:
##     Min      1Q  Median      3Q     Max 
## -4.0825 -0.8181  0.2161  0.9669  3.7258 
## 
## Coefficients: (1 not defined because of singularities)
##                  Estimate Std. Error t value Pr(>|t|)    
## (Intercept)       4.01584    0.50178   8.003 2.01e-12 ***
## hasFacade        -0.60508    0.29854  -2.027   0.0453 *  
## hasController    -0.03655    0.29367  -0.124   0.9012    
## useException      0.28476    0.30871   0.922   0.3585    
## useInheritance    0.05499    0.37693   0.146   0.8843    
## usedHashMap       0.39235    0.41183   0.953   0.3430    
## hasTests          3.02713    0.32351   9.357 2.15e-15 ***
## equals            0.08197    0.28529   0.287   0.7745    
## hashCode               NA         NA      NA       NA    
## useInterface      1.45936    0.31613   4.616 1.14e-05 ***
## useAbstractClass  1.02445    0.44740   2.290   0.0241 *  
## ---
## Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
## 
## Residual standard error: 1.465 on 102 degrees of freedom
## Multiple R-squared:  0.6075, Adjusted R-squared:  0.5729 
## F-statistic: 17.54 on 9 and 102 DF,  p-value: < 2.2e-16

tidy(mod)

## # A tibble: 10 x 5
##    term             estimate std.error statistic  p.value
##    <chr>               <dbl>     <dbl>     <dbl>    <dbl>
##  1 (Intercept)        4.02       0.502     8.00  2.01e-12
##  2 hasFacade         -0.605      0.299    -2.03  4.53e- 2
##  3 hasController     -0.0366     0.294    -0.124 9.01e- 1
##  4 useException       0.285      0.309     0.922 3.58e- 1
##  5 useInheritance     0.0550     0.377     0.146 8.84e- 1
##  6 usedHashMap        0.392      0.412     0.953 3.43e- 1
##  7 hasTests           3.03       0.324     9.36  2.15e-15
##  8 equals             0.0820     0.285     0.287 7.74e- 1
##  9 useInterface       1.46       0.316     4.62  1.14e- 5
## 10 useAbstractClass   1.02       0.447     2.29  2.41e- 2

nota = 4.015 - (0.605) * Facade - (0.03) * Controller + (0.284) * Exception + (0.05499) * Herança + (0.39235) * hashMap + (3.02713) * Testes + (0.08197) * equals + (0.08197) * hashCode + (1.45936) * Interface + (1.02445) * ClasseAbstrata que explica 60% da variável de resposta (R² = 0.6075). Podemos observar, a partir do modelo que a variável Testes é aquela que mais tem influencia, seguida do uso de Interface e classes abstratas.

LABS

l_nota = labs_nota %>% select(-aluno, -X, -X.2, -X.3, -X.4)
mod <- lm(X.1 ~ hasFacade +  hasController + useException + useInheritance + usedHashMap + hasTests + equals + hashCode + useInterface + useAbstractClass, 
          data = l_nota)
mod

## 
## Call:
## lm(formula = X.1 ~ hasFacade + hasController + useException + 
##     useInheritance + usedHashMap + hasTests + equals + hashCode + 
##     useInterface + useAbstractClass, data = l_nota)
## 
## Coefficients:
##      (Intercept)         hasFacade     hasController      useException  
##          5.04101          -0.18287          -0.19136          -0.10531  
##   useInheritance       usedHashMap          hasTests            equals  
##          2.33319           0.29382           1.64019           0.14771  
##         hashCode      useInterface  useAbstractClass  
##               NA          -0.04985           0.35728

summary(mod)

## 
## Call:
## lm(formula = X.1 ~ hasFacade + hasController + useException + 
##     useInheritance + usedHashMap + hasTests + equals + hashCode + 
##     useInterface + useAbstractClass, data = l_nota)
## 
## Residuals:
##     Min      1Q  Median      3Q     Max 
## -3.1792 -0.2974  0.2026  0.5610  2.4585 
## 
## Coefficients: (1 not defined because of singularities)
##                  Estimate Std. Error t value Pr(>|t|)    
## (Intercept)       5.04101    1.08584   4.642 1.04e-05 ***
## hasFacade        -0.18287    0.73048  -0.250  0.80283    
## hasController    -0.19136    0.19035  -1.005  0.31714    
## useException     -0.10531    0.23320  -0.452  0.65255    
## useInheritance    2.33319    0.72216   3.231  0.00167 ** 
## usedHashMap       0.29382    0.22471   1.308  0.19400    
## hasTests          1.64019    0.34756   4.719 7.63e-06 ***
## equals            0.14771    0.20021   0.738  0.46236    
## hashCode               NA         NA      NA       NA    
## useInterface     -0.04985    0.23554  -0.212  0.83282    
## useAbstractClass  0.35728    0.20054   1.782  0.07782 .  
## ---
## Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
## 
## Residual standard error: 0.9817 on 101 degrees of freedom
## Multiple R-squared:  0.2999, Adjusted R-squared:  0.2375 
## F-statistic: 4.807 on 9 and 101 DF,  p-value: 2.416e-05

tidy(mod)

## # A tibble: 10 x 5
##    term             estimate std.error statistic    p.value
##    <chr>               <dbl>     <dbl>     <dbl>      <dbl>
##  1 (Intercept)        5.04       1.09      4.64  0.0000104 
##  2 hasFacade         -0.183      0.730    -0.250 0.803     
##  3 hasController     -0.191      0.190    -1.01  0.317     
##  4 useException      -0.105      0.233    -0.452 0.653     
##  5 useInheritance     2.33       0.722     3.23  0.00167   
##  6 usedHashMap        0.294      0.225     1.31  0.194     
##  7 hasTests           1.64       0.348     4.72  0.00000763
##  8 equals             0.148      0.200     0.738 0.462     
##  9 useInterface      -0.0498     0.236    -0.212 0.833     
## 10 useAbstractClass   0.357      0.201     1.78  0.0778

LABS + PROVAS

l_p_nota = provas_labs_nota %>% select(-aluno, -X)
mod <- lm(X.1 ~ hasFacade +  hasController + useException + useInheritance + usedHashMap + hasTests + equals + hashCode + useInterface + useAbstractClass, 
          data = l_p_nota)
mod

## 
## Call:
## lm(formula = X.1 ~ hasFacade + hasController + useException + 
##     useInheritance + usedHashMap + hasTests + equals + hashCode + 
##     useInterface + useAbstractClass, data = l_p_nota)
## 
## Coefficients:
##      (Intercept)         hasFacade     hasController      useException  
##           5.1678           -0.2757           -0.3002           -0.0932  
##   useInheritance       usedHashMap          hasTests            equals  
##           1.0051           -0.1622            2.6591            0.1316  
##         hashCode      useInterface  useAbstractClass  
##               NA            0.6179            0.6083

summary(mod)

## 
## Call:
## lm(formula = X.1 ~ hasFacade + hasController + useException + 
##     useInheritance + usedHashMap + hasTests + equals + hashCode + 
##     useInterface + useAbstractClass, data = l_p_nota)
## 
## Residuals:
##     Min      1Q  Median      3Q     Max 
## -4.8422 -0.6921  0.2436  0.7624  4.3335 
## 
## Coefficients: (1 not defined because of singularities)
##                  Estimate Std. Error t value Pr(>|t|)    
## (Intercept)        5.1678     0.3234  15.982  < 2e-16 ***
## hasFacade         -0.2757     0.2434  -1.133 0.258443    
## hasController     -0.3002     0.1668  -1.799 0.073162 .  
## useException      -0.0932     0.1989  -0.469 0.639712    
## useInheritance     1.0051     0.2589   3.882 0.000131 ***
## usedHashMap       -0.1622     0.1854  -0.875 0.382441    
## hasTests           2.6591     0.2306  11.530  < 2e-16 ***
## equals             0.1316     0.1718   0.766 0.444221    
## hashCode               NA         NA      NA       NA    
## useInterface       0.6179     0.1945   3.176 0.001670 ** 
## useAbstractClass   0.6083     0.1965   3.095 0.002182 ** 
## ---
## Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
## 
## Residual standard error: 1.352 on 261 degrees of freedom
## Multiple R-squared:  0.4782, Adjusted R-squared:  0.4603 
## F-statistic: 26.58 on 9 and 261 DF,  p-value: < 2.2e-16

tidy(mod)

## # A tibble: 10 x 5
##    term             estimate std.error statistic  p.value
##    <chr>               <dbl>     <dbl>     <dbl>    <dbl>
##  1 (Intercept)        5.17       0.323    16.0   1.47e-40
##  2 hasFacade         -0.276      0.243    -1.13  2.58e- 1
##  3 hasController     -0.300      0.167    -1.80  7.32e- 2
##  4 useException      -0.0932     0.199    -0.469 6.40e- 1
##  5 useInheritance     1.01       0.259     3.88  1.31e- 4
##  6 usedHashMap       -0.162      0.185    -0.875 3.82e- 1
##  7 hasTests           2.66       0.231    11.5   3.91e-25
##  8 equals             0.132      0.172     0.766 4.44e- 1
##  9 useInterface       0.618      0.195     3.18  1.67e- 3
## 10 useAbstractClass   0.608      0.197     3.10  2.18e- 3